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The recommendations are: For children in age less than one year: 30 minute physical activity, 0 hours screen time and 14 – 17 hours of sleep time per day. For children in age 1 year: 180 minutes physical activity, 0 hours screen time, 11–14 hours of sleep time per day. ... In Android a similar feature called "digital wellbeing" has been implemented to keep track of cell phone usage. [85] These apps usually work by doing one of two things: increasing awareness by sending user usage summaries, or notifying the user when he/she has exceeded some user-defined time-limit for each app or app category. ... The researchers implement an Android app that combined these three intervention types and found that users reduced their time with the apps they feel are a poor use of time by 21% while their use of the apps they feel are a good use of time remained unchanged. [86] AppDetox allows users to define rules that limit their usage of specific apps. [87] PreventDark detects and prevents problematic usage of smartphones in the dark. [88] Using vibrations instead of notifications to limit app usage has also been found to be effective. [89] Further, researchers have found group-based interventions that rely on users sharing their limiting behaviors with others to be effective. [90] Bans on mobile phone use [ edit ] See also: Mobile phone use in schools In some places in the world the use of mobile phones was banned in classes during instructional time, for example, in France , Ontario . ... Yale University Press. ISBN 978-0-300-19621-4 . ^ Chan, Nee Nee; Walker, Caroline; Gleaves, Alan (1 March 2015).
Andrews' Diseases of the Skin: clinical Dermatology . Saunders Elsevier. ISBN 978-0-7216-2921-6 . ^ Rapini, Ronald P.; Bolognia, Jean L.; Jorizzo, Joseph L. (2007). ... ISBN 978-1-4160-2999-1 . v t e Amyloidosis Common amyloid forming proteins AA ATTR Aβ2M AL Aβ / APP AIAPP ACal APro AANF ACys ABri Systemic amyloidosis AL amyloidosis AA amyloidosis Aβ2M/Haemodialysis-associated AGel/Finnish type AA/Familial Mediterranean fever ATTR/Transthyretin-related hereditary Organ-limited amyloidosis Heart AANF/Isolated atrial Brain Familial amyloid neuropathy ACys+ABri/Cerebral amyloid angiopathy Aβ/Alzheimer's disease Kidney AApoA1+AFib+ALys/Familial renal Skin Primary cutaneous amyloidosis Amyloid purpura Endocrine Thyroid ACal/Medullary thyroid cancer Pituitary APro/Prolactinoma Pancreas AIAPP/Insulinoma AIAPP/Diabetes mellitus type 2 This cutaneous condition article is a stub .
Hereditary amyloidosis refers to a group of inherited conditions that make up one of the subtypes of amyloidosis . Hereditary amyloidosis is characterized by the deposit of an abnormal protein called amyloid in multiple organs of the body where it should not be, which causes disruption of organ tissue structure and function. In hereditary amyloidosis, amyloid deposits most often occur in tissues of the heart, kidneys, and nervous system. While symptoms of hereditary amyloidosis may appear in childhood, most individuals do not experience symptoms until adulthood. There are many types of hereditary amyloidosis associated with different gene mutations and abnormal proteins.
Andrews' Diseases of the Skin: clinical Dermatology . Saunders Elsevier. ISBN 978-0-7216-2921-6 . ^ Rapini, Ronald P.; Bolognia, Jean L.; Jorizzo, Joseph L. (2007). ... ISBN 978-1-4160-2999-1 . v t e Amyloidosis Common amyloid forming proteins AA ATTR Aβ2M AL Aβ / APP AIAPP ACal APro AANF ACys ABri Systemic amyloidosis AL amyloidosis AA amyloidosis Aβ2M/Haemodialysis-associated AGel/Finnish type AA/Familial Mediterranean fever ATTR/Transthyretin-related hereditary Organ-limited amyloidosis Heart AANF/Isolated atrial Brain Familial amyloid neuropathy ACys+ABri/Cerebral amyloid angiopathy Aβ/Alzheimer's disease Kidney AApoA1+AFib+ALys/Familial renal Skin Primary cutaneous amyloidosis Amyloid purpura Endocrine Thyroid ACal/Medullary thyroid cancer Pituitary APro/Prolactinoma Pancreas AIAPP/Insulinoma AIAPP/Diabetes mellitus type 2 This cutaneous condition article is a stub .
Andrews' Diseases of the Skin: clinical Dermatology . Saunders Elsevier. ISBN 978-0-7216-2921-6 . ^ Rapini, Ronald P.; Bolognia, Jean L.; Jorizzo, Joseph L. (2007). ... ISBN 978-1-4160-2999-1 . v t e Amyloidosis Common amyloid forming proteins AA ATTR Aβ2M AL Aβ / APP AIAPP ACal APro AANF ACys ABri Systemic amyloidosis AL amyloidosis AA amyloidosis Aβ2M/Haemodialysis-associated AGel/Finnish type AA/Familial Mediterranean fever ATTR/Transthyretin-related hereditary Organ-limited amyloidosis Heart AANF/Isolated atrial Brain Familial amyloid neuropathy ACys+ABri/Cerebral amyloid angiopathy Aβ/Alzheimer's disease Kidney AApoA1+AFib+ALys/Familial renal Skin Primary cutaneous amyloidosis Amyloid purpura Endocrine Thyroid ACal/Medullary thyroid cancer Pituitary APro/Prolactinoma Pancreas AIAPP/Insulinoma AIAPP/Diabetes mellitus type 2 This cutaneous condition article is a stub .
This loss of brain volume affects ones ability to live and function properly, ultimately being fatal. [5] Beta-amyloid is a small piece of a larger protein called the amyloid precursor protein (APP). Once APP is activated, it is cut into smaller sections of other proteins. ... Alpha-secretase cleavage of APP, which precludes the production of Aβ, is the most common processing event for APP. 21 allelic mutations have been discovered in the APP gene. These guarantee onset of early-onset familial Alzheimer disease and all occur in the region of the APP gene that encodes the Aβ domain. ... "A pathogenic mutation for probable Alzheimer's disease in the APP gene at the N-terminus of beta-amyloid". ... PMID 16817891 . ^ Chow VW, Mattson MP, Wong PC, Gleichmann M (March 2010). "An overview of APP processing enzymes and products" .
A number sign (#) is used with this entry because cerebral amyloid angiopathy (CAA) can be caused by mutation in the gene encoding the amyloid precursor protein (APP; 104760). Mutations in the APP gene can also cause autosomal dominant Alzheimer disease-1 (AD1; 104300), which shows overlapping clinical and neuropathologic features. ... Revesz et al. (2003) reviewed the pathology and genetics of APP-related CAA and discussed the different neuropathologic consequences of different APP mutations. ... In 4 affected members of an Italian family with cerebral amyloid angiopathy, Obici et al. (2005) identified a mutation in the APP gene (104760.0019). In 2 brothers from an extensive Iowa kindred with progressive dementia and cerebroarterial amyloidosis, Grabowski et al. (2001) identified a heterozygous mutation in the APP gene (N694D; 104760.0016). ... Human APP mRNA was detected in neurons and neuronal processes, but not in vessel walls. ... Herzig et al. (2006) extended their earlier studies by developing several murine models of APP-related CAA and APP-related parenchymal amyloid deposition.
Etiology HCHWA-D is due to a mutation in the APP gene on chromosome 21q21.2, encoding the beta-amyloid precursor protein. ... Genetic testing reveals a mutation in the APP gene. Differential diagnosis Differential diagnoses include other conditions that could cause intracerebral hemorrhage such as coagulopathies, vasculitis (see these terms), CNS neoplasms, cerebral vascular malformations, ischemic stroke and antecedent trauma.
The Dutch type is the most common, with over 200 affected individuals reported in the scientific literature. Causes Mutations in the APP gene are the most common cause of hereditary cerebral amyloid angiopathy. APP gene mutations cause the Dutch, Italian, Arctic, Iowa, Flemish, and Piedmont types of this condition. ... Familial British and Danish dementia are caused by mutations in the ITM2B gene. The APP gene provides instructions for making a protein called amyloid precursor protein. ... Additionally, the ITM2B protein may be involved in processing the amyloid precursor protein. Mutations in the APP , CST3 , or ITM2B gene lead to the production of proteins that are less stable than normal and that tend to cluster together (aggregate). ... Learn more about the genes associated with Hereditary cerebral amyloid angiopathy APP CST3 ITM2B Inheritance Pattern Hereditary cerebral amyloid angiopathy caused by mutations in the APP , CST3 , or ITM2B gene is inherited in an autosomal dominant pattern , which means one copy of the altered gene in each cell is sufficient to cause the disorder.
The authors discussed the abnormalities of APP processing, the role of abnormal intracellular protein folding, oxidative stress, and the potential role of cholesterol in the pathogenic cascade of IBM. ... Accumulation of the amyloid-beta peptide, which is derived from proteolysis of the larger beta-APP, seems to be an early pathologic event in both Alzheimer disease and IBM; in the latter, it occurs predominantly intracellularly within affected myofibers. To elucidate the possible role of beta-APP mismetabolism in the pathogenesis of IBM, Sugarman et al. (2002) selectively targeted beta-APP overexpression to skeletal muscle in transgenic mice, using the muscle creatine kinase promoter. They reported that older (more than 10 months) transgenic mice exhibited intracellular immunoreactivity to beta-APP and its proteolytic derivatives in skeletal muscle. In this transgenic model, selective overexpression of beta-APP led to the development of a subset of other histopathologic and clinical features characteristic of IBM, including centric nuclei, inflammation, and deficiencies in motor performance.
Inclusion body myositis (IBM) is a slowly progressive degenerative inflammatory disorder of skeletal muscles characterized by late onset weakness of specific muscles and distinctive histopathological features. Epidemiology IBM has a highly variable prevalence according to geographic, ethnic and age criteria. Prevalence in the general population ranges from 1:1,000,000 to 1:14,000 but a three-fold increase is observed when considering only a population over 50 years. Underdiagnosis may be an explanation for the high ethno-geographic variation. Male-to-female ratio is 2:1 on average (0.5 to 6.5:1). Clinical description IBM onset is over 50 years but may also occur earlier, in the 5th decade.
Inflammatory muscle disease in older adults This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed. Find sources: "Inclusion body myositis" – news · newspapers · books · scholar · JSTOR ( September 2009 ) ( Learn how and when to remove this template message ) Inclusion body myositis Other names sIBM Specialty Rheumatology Inclusion body myositis ( IBM ) ( / m aɪ oʊ ˈ s aɪ t ɪ s / ) (sometimes called sporadic inclusion body myositis , sIBM ) is the most common inflammatory muscle disease in older adults. [1] The disease is characterized by slowly progressive weakness and wasting of both proximal muscles (closest to the body's midline) and distal muscles (the limbs), most apparent in the finger flexors and knee extensors . [2] IBM is often confused with an entirely different class of diseases, called hereditary inclusion body myopathies (hIBM). [3] [4] The "M" in hIBM is an abbreviation for "myopathy" while the "M" in IBM is an abbreviation for "myositis". These diseases should not be confused with each other. In IBM, two processes appear to occur in the muscles in parallel, one autoimmune and the other degenerative. Inflammation is evident from the invasion of muscle fibers by immune cells .
Idiopathic inflammatory myopathy is a group of disorders characterized by inflammation of the muscles used for movement (skeletal muscles). Idiopathic inflammatory myopathy usually appears in adults between ages 40 and 60 or in children between ages 5 and 15, though it can occur at any age. The primary symptom of idiopathic inflammatory myopathy is muscle weakness, which develops gradually over a period of weeks to months or even years. Other symptoms include joint pain and general tiredness (fatigue). There are several forms of idiopathic inflammatory myopathy, including polymyositis, dermatomyositis, and sporadic inclusion body myositis. Polymyositis and dermatomyositis involve weakness of the muscles closest to the center of the body (proximal muscles), such as the muscles of the hips and thighs, upper arms, and neck.
Inclusion body myositis (IBM) is a progressive muscle disorder characterized by muscle inflammation, weakness, and atrophy (wasting). It is a type of inflammatory myopathy . IBM develops in adulthood, usually after age 50. The symptoms and rate of progression vary from person to person. The most common symptoms include progressive weakness of the legs, arms, fingers, and wrists. Some people also have weakness of the facial muscles (especially muscles controlling eye closure), or difficulty swallowing (dysphagia). Muscle cramping and pain are uncommon, but have been reported in some people.
Cutaneous amyloidosis refers to a variety of skin diseases characterized histologically by the extracellular accumulation of amyloid deposits in the dermis. Rare forms include lichen amyloidosus, X-linked reticulate pigmentary disorder, primary localized cutaneous nodular amyloidosis, and macular amyloidosis (see these terms).
Lichen amyloidosis is a rare chronic form of cutaneous amyloidosis (see this term), a skin disease characterized by the accumulation of amyloid deposits in the dermis, clinically characterized by the development of pruritic, often pigmented, hyperkeratotic papules on trunk and extremities, especially on the shins, and histologically by the deposition of amyloid or amyloid-like proteins in the papillary dermis.
Primary cutaneous amyloidosis is a form of amyloidosis , a group of conditions in which an abnormal protein (called amyloid) builds up in various organs and tissues throughout the body. In primary cutaneous amyloidosis, specifically, this protein accumulates in the skin. There are three main forms of primary cutaneous amyloidosis: Lichen amyloidosis - multiple itchy, raised spots which are scaly and red/brown in color. This rash generally affects the shins, thighs, feet and forearms. Macular amyloidosis - mild to severely itchy, flat, dusky-brown or greyish colored spots that may come together to form patches of darkened skin. This rash generally appears on the upper back between the shoulder blades, the chest and less commonly, the arms.
Clinical Features Blais et al. (1999) and Adam et al. (2002) reported significantly lower plasma aminopeptidase P (APP) activities in patients with a history of AEACEI. ... Measured genotype analysis strongly suggested that the linkage signal for APP activity at this locus was accounted for predominantly by the SNP association. ... There was a significant association between the -2399A allele and decreased serum APP activity in both men and women, but the APP activity was lower in men regardless of genotype. ... This haplotype was associated with decreased plasma APP activity and decreased luciferase gene expression compared to other haplotypes of these SNPs. Cilia La Corte et al. (2011) concluded that the ATG haplotype of XPNPEP2 is functional and contributes to the development of ACEi-angioedema through a reduction in APP activity.
Acquired angioedema (AAE) is a rare disorder that causes recurrent episodes of swelling (edema) of the face or body, lasting several days. People with AAE may have swelling of the face, lips, tongue, limbs, or genitals. People with AAE can have edema of the lining of the digestive tract, which can cause abdominal pain and nausea, as well as edema of the upper airway, which can be life-threatening. Swelling episodes may have various triggers, such as mild trauma (such as dental work), viral illness, cold exposure, pregnancy, certain foods, or emotional stress. The frequency of episodes is unpredictable and can vary widely. There are two forms of AAE.
A rare disease characterized by the occurrence of transitory and recurrent subcutaneous and/or submucosal edemas resulting in swelling and/or abdominal pain due to an acquired C1 inhibitor (C1-INH) deficiency. Epidemiology Prevalence is unknown. Clinical description Onset most commonly occurs after 50 years of age. Patients present with white, circumscribed nonpruritic edemas that remain for a period of 48 to 72 hours and recur with variable frequency. The edemas may involve the digestive tract resulting in a clinical picture similar to that seen in intestinal occlusion syndrome, sometimes associated with ascites and hypovolemic shock. Laryngeal edema can be life-threatening with a risk of death of 25% in the absence of appropriate treatment.
Q170H and R181G mutant mice showed significant attenuation of APP processing compared to wildtype, with a decrease in APP-CTF-alpha levels and an increase in sAPP-beta levels, indicating that the mutations attenuated Adam10 alpha-secretase activity on APP. Crossing these Adam10 mutant mice with the Tg2576 AD mouse model showed that the Adam10 mutations increased amyloidogenic APP processing, as manifest by a shift from the alpha-secretase to the amyloidogenic beta-secretase pathway. ... Collectively, these findings suggested that diminished alpha-secretase activity of ADAM10 on APP resulting from mutations in the ADAM10 prodomain can cause AD-related pathology.
Discovering Psychology . Worth Publishers. ISBN 0-7167-5704-4 . [ page needed ] ^ Fried, Yehuda; Joseph Agassi (1976). ... Needham Heights, MA, USA: Allyn & Bacon. ISBN 0-205-14164-1 . Das, J.P. (2002). A better look at intelligence. ... Cambridge: Cambridge University Press. pp. 445–476. ISBN 978-0-521-59648-0 . Lay summary (22 July 2013). ... Essentials of Psychological Testing . John Wiley & Sons. ISBN 978-0-471-41978-5 . Lay summary (10 October 2013). ... Cambridge: Cambridge University Press. pp. 20–38. ISBN 978-0-521-73911-5 . Lay summary (9 February 2012).
See also APP-related cerebral amyloid angiopathy (CAA; 605714), which shows overlapping clinical and neuropathologic features. ... Genetic analysis identified a mutation in the APP gene (V717I; 104760.0002). Farlow et al. (1994) reviewed the clinical characteristics of the disorder in the AD family reported by Murrell et al. (1991) in which affected members had a mutation in the APP gene (V717F; 104760.0003). ... Rovelet-Lecrux et al. (2006) estimated that in their whole cohort of 65 ADEOAD families, the frequency of the APP locus duplication was roughly 8% (5 of 65), which corresponds to half of the contribution of APP missense mutations to ADEOAD. ... Revesz et al. (2003) reviewed the pathology and genetics of APP-related CAA and discussed the different neuropathologic consequences of different APP mutations. ... Further studies indicated that suppression of PPARGC1A in hyperglycemia resulted in activation of the FOXO3A (602681) transcription factor, which inhibits nonamyloidogenic secretase processing of APP and promotes amyloidogenic processing of APP.
For a general phenotypic description and a discussion of genetic heterogeneity of Alzheimer disease, see 104300. Mapping Liu et al. (2007) conducted a genome screen of 103 patients with late-onset AD who were ascertained as part of the Genetic Research in Isolated Populations (GRIP) program that was conducted in an isolated population from the southwestern area of the Netherlands. Genealogic information resulted in an extremely large and complex pedigree of 4,645 members. The pedigree was split into 35 subpedigrees to reduce the computational burden of linkage analysis. The strongest evidence for linkage, hlod = 5.20 at marker D1S498, was obtained at chromosome 1q21 (AD13).
There are three subtypes of early-onset familial AD which are each associated with changes (mutations) in unique genes: (1) Alzheimer disease, type 1 is caused by mutations in the APP gene (2) Alzheimer disease, type 3 is caused by mutations in the PSEN1 gene (3) Alzheimer disease, type 4 is caused by mutations in the PSEN2 gene.
For a general phenotypic description and a discussion of genetic heterogeneity of Alzheimer disease (AD), see 104300. Mapping By genomewide linkage analysis of 466 families with late-onset AD, including 730 affected sib pairs, Pericak-Vance et al. (2000) identified a candidate disease locus on chromosome 9p22.1 (nonparametric maximum lod score of 2.97 at marker D9S741). Analysis of a subset of 199 families in which there was at least 1 autopsy-confirmed AD case yielded a higher lod score of 4.31 at the same marker. Scott et al. (2003) reexamined 437 white AD families included in the original report by Pericak-Vance et al. (2000) by considering age of onset as a covariate. Ordered-subsets analysis included continuous covariates in linkage analysis by rank ordering families by a covariate and summing lod scores.
In HEK293 cells with an AD-associated APP mutation (104760.0008), overexpression of SORCS1 resulted in a significant decrease in amyloid-beta-40 and -beta-42 secretion, whereas suppression of SORCS1 in HEK293 cells increased beta-amyloid-40 levels. The findings indicated that SORCS1 can influence APP processing, and Reitz et al. (2011) suggested that variation in the SORCS1 gene may be associated with risk of LOAD. ... The findings indicated a role for calcium signaling in APP (104760) processing and suggested that variations in the CALHM1 gene may influence susceptibility to late-onset AD.
For a phenotypic description and a discussion of genetic heterogeneity of Alzheimer disease (AD), see 104300. Mapping In a late-onset form of familial Alzheimer disease (AD), Pericak-Vance et al. (1997) identified linkage to a locus on chromosome 12. From a series of multiplex families affected with late-onset AD (at least 60 years) ascertained during the previous 14 years and for which DNA had been obtained, Pericak-Vance et al. (1997) selected a subset of 16 families (with 52 AD patients) to use for a genomewide screen. A second subset of 38 families (with 89 AD patients) was used for a follow-up analysis. Linkage analysis was performed using both genetic model-dependent (lod score) and model-independent methods.
Clinical Features Leuba et al. (2000) described a Swiss family whose members presented with standard clinical and neuropathologic features of Alzheimer disease (104300) and, in particular, severe neurofibrillary tangle degeneration present in the hippocampus and in several cortical areas, together with a large number of beta-amyloid deposits and senile plaques. The brain pathology of 5 deceased members of this family, from 2 generations, represented a coexisting beta-amyloid and prion protein (PrP; 176640) pathology. Frequent beta-amyloid-positive senile plaques were observed, together with senile plaques stained by the monoclonal antibody against PrP(106-126). In all 5 cases, the cerebral cortex showed spongiform changes, mainly in the superficial layers, with some degree of gliosis. Successive sections showed that both beta-amyloid- and PrP-positive senile plaques were deposited in all layers of the frontal and temporal cortex.
Within this candidate region, 1 gene of particular interest was that encoding cystatin-3 (CST3; 604312), because it is known to be an amyloidogenic protein and is codeposited with the amyloid-beta precursor protein (APP; 104760) in amyloid plaques in the brain of AD patients. Using a covariate-based linkage method, Olson et al. (2001) showed that the APP region on chromosome 21q21 is strongly linked to AD-affected sib pairs of the oldest current age (i.e., age either at last exam or at death) who lacked E4 alleles at the apolipoprotein E (APOE; 107741) locus. ... Two-locus analysis provided evidence of strong epistasis between 20p and the APP region, limited to the oldest age group and to those lacking E4 alleles at the APOE locus.
When analysis was limited to the affecteds only, a lod score of 2.5 at theta = 0 was obtained for linkage with BCL3 (109560). ... Onset was early in 4 other families tested; 2 had chromosome 21 APP (104760) mutations and 2 showed linkage to chromosome 14, thus representing AD1 (104300) and AD3 (607822), respectively.
Etiology EOAD is the consequence of either PSEN1 mutations (69%), APP mutations (13%), or APP duplication (7,5%), and exceptionally of PSEN2 mutations (2%).
A number sign (#) is used with this entry because Alzheimer disease-4 (AD4) is caused by heterozygous mutation in the presenilin-2 gene (PSEN2; 600759) on chromosome 1q42. For a phenotypic description and a discussion of genetic heterogeneity of Alzheimer disease, see 104300. Clinical Features Bird et al. (1988) described 5 German kindreds with an autosomal dominant early-onset form of Alzheimer disease. All families were descendants of a group of immigrants, known as the Volga Germans, who came to the United States between 1870 and 1920. Their ancestors had moved from Germany to the southern Volga region of Russia in the 1760s.
There are three subtypes of early-onset familial AD which are each associated with changes (mutations) in unique genes: (1) Alzheimer disease, type 1 is caused by mutations in the APP gene (2) Alzheimer disease, type 3 is caused by mutations in the PSEN1 gene (3) Alzheimer disease, type 4 is caused by mutations in the PSEN2 gene.
For a general phenotypic description and a discussion of genetic heterogeneity of Alzheimer disease, see 104300. Mapping Liu et al. (2007) conducted a genome screen of 103 patients with late-onset AD who were ascertained as part of the Genetic Research in Isolated Populations (GRIP) program that was conducted in an isolated population from the southwestern area of the Netherlands. Genealogic information resulted in an extremely large and complex pedigree of 4,645 members. The pedigree was split into 35 subpedigrees to reduce the computational burden of linkage analysis. They found significant evidence of linkage of AD to 3q22-q24 (AD15), in a region of 18 cM from D3S3514 to D3S3626 that reached a maximum hlod of 4.44 at marker D3S1579.
For a general phenotypic description and a discussion of genetic heterogeneity of Alzheimer disease, see 104300. Mapping In a genome screen of individuals from an isolated population from the southwestern area of the Netherlands, ascertained as part of the Genetic Research in Isolated Populations (GRIP) program, Liu et al. (2007) found the strongest evidence of linkage for chromosome 1q21 (AD13; 611152). Approximately 30 cM upstream of this locus, at 1q25, another peak (AD14) was found (hlod = 4.0 at marker D1S218). Liu et al. (2007) noted that these 2 loci were in a linkage region spanning 1q21-q31 identified by Zubenko et al. (1998), Hiltunen et al. (2001), Myers et al. (2002), and Blacker et al. (2003). Haplotype analysis showed that the 2 linkage peaks on chromosome 1q21 and 1q25 are explained by different haplotypes, of 15 cM and 21 cM, respectively, segregating in different families.
For a phenotypic description and a discussion of genetic heterogeneity of Alzheimer disease (AD), see 104300. Mapping Giedraitis et al. (2006) conducted a genome scan with 369 microsatellite markers in 12 extended families collected in Sweden. Age at disease onset ranged from 53 to 78 years, but in 10 of the families there was at least 1 member with age at onset of less than 65 years. Mutations in known early-onset Alzheimer disease susceptibility genes were excluded. All persons were genotyped for APOE (107741), but no clear linkage with the E4 allele was observed.
In 2 Belgian families with early-onset autosomal dominant AD, Van Broeckhoven et al. (1987) excluded linkage to the APP locus on chromosome 21q. One pedigree contained 36 patients in 6 generations, and the second had 22 patients spanning 5 generations.
For a phenotypic description and a discussion of genetic heterogeneity of Alzheimer disease (AD), see 104300. Mapping In an extended multiplex family, ascertained in a population-based study of early-onset AD in the northern Netherlands, Rademakers et al. (2005) obtained conclusive evidence of linkage of AD with a candidate region of 19.7 cM at 7q36. They identified a shared haplotype at 7q36 between the index family and 3 of 6 multiplex AD-affected families from the same geographic region, which was indicative of a founder effect and defined a priority region of 9.3 cM. Mutation analysis of coding exons of 29 candidate genes identified only an exonic silent mutation in the PAXIP1 gene (608254), 38030G-C in the exon 10 genomic sequence, which affected codon 626. It remained to be determined whether PAXIP1 has a functional role in the expression of AD in the index family or whether another mutation at this locus explained the observed linkage and sharing.
For a phenotypic description and a discussion of genetic heterogeneity of Alzheimer disease (AD), see 104300. Mapping In a systematic survey of the human genome in patients with AD, Zubenko et al. (1998) identified D10S1423, located at 10p13, as a candidate susceptibility locus. The allelic associations in this survey were observed in independent samples of autopsied AD cases and controls from geographically disparate sites (Boston and Pittsburgh). Majores et al. (2000) replicated these findings by identifying an association of the D10S1423 234-bp allele with AD in an ethnically homogeneous group of 397 German AD cases and controls. Zubenko et al. (2001) described a prospective, longitudinal, double-blind assessment of the age-specific risk of AD encountered by 325 asymptomatic first-degree relatives of AD probands who carried the D10S1423 234-bp allele, the APOE E4 allele (107741), or both, after 11.5 years of systematic follow-up.
The hypothesis holds that an amyloid-related mechanism that prunes neuronal connections in the brain in the fast-growth phase of early life may be triggered by ageing-related processes in later life to cause the neuronal withering of Alzheimer's disease. [64] N-APP, a fragment of APP from the peptide's N-terminus , is adjacent to beta-amyloid and is cleaved from APP by one of the same enzymes. N-APP triggers the self-destruct pathway by binding to a neuronal receptor called death receptor 6 (DR6, also known as TNFRSF21 ). [64] DR6 is highly expressed in the human brain regions most affected by Alzheimer's, so it is possible that the N-APP/DR6 pathway might be hijacked in the ageing brain to cause damage. ... Osaka mutation A Japanese pedigree of familial Alzheimer's disease was found to be associated with a deletion mutation of codon 693 of APP. [65] This mutation and its association with Alzheimer's disease was first reported in 2008. [66] This mutation is known as the Osaka mutation. ... A β is a fragment from the larger amyloid precursor protein (APP). APP is a transmembrane protein that penetrates through the neuron's membrane. APP is critical to neuron growth, survival, and post-injury repair. [103] [104] In Alzheimer's disease, gamma secretase and beta secretase act together in a proteolytic process which causes APP to be divided into smaller fragments. [105] One of these fragments gives rise to fibrils of amyloid beta, which then form clumps that deposit outside neurons in dense formations known as senile plaques . [98] [106] AD is also considered a tauopathy due to abnormal aggregation of the tau protein .
Overview Alzheimer's disease is a brain disorder that gets worse over time. It's characterized by changes in the brain that lead to deposits of certain proteins. Alzheimer's disease causes the brain to shrink and brain cells to eventually die. Alzheimer's disease is the most common cause of dementia — a gradual decline in memory, thinking, behavior and social skills. These changes affect a person's ability to function. About 6.5 million people in the United States age 65 and older live with Alzheimer's disease.
Researchers have found that this form of the disorder can result from mutations in the APP , PSEN1 , or PSEN2 genes. When any of these genes is altered, large amounts of a toxic protein fragment called amyloid beta peptide are produced in the brain. ... As a result, people with Down syndrome have three copies of many genes in each cell, including the APP gene, instead of the usual two copies. ... Learn more about the genes associated with Alzheimer disease APOE APP PSEN1 PSEN2 Inheritance Pattern Early-onset familial Alzheimer disease is inherited in an autosomal dominant pattern , which means one copy of an altered gene in each cell is sufficient to cause the disorder.
This skin eruption is often accompanied by a fever , muscle aches , nausea , and an elevated white blood cell count . [1] Annular pustular psoriasis (APP), a rare form of GPP, is the most common type seen during childhood. [6] APP tends to occur in women more frequently than in men, and is usually less severe than other forms of generalized pustular psoriasis such as impetigo herpetiformis. [6] This form of psoriasis is characterized by ring-shaped plaques with pustules around the edges and yellow crusting. [6] APP most often affects the torso, neck, arms, and legs. [6] Diagnosis [ edit ] Classification [ edit ] Pustular psoriasis is classified into two major forms: localized and generalized pustular psoriasis . [1] Within these two categories there are several variants: Classification of Localized and Generalized Pustular Psoriasis Localized pustular psoriasis Palmoplantar pustulosis (acute and chronic) Acrodermatitis continua (of Hallopeau) Generalized pustular psoriasis (von Zumbusch) acute generalized pustular psoriasis Acute generalized pustular psoriasis of pregnancy ( impetigo herpetiformis ) Infantile and juvenile Subacute circinate and annular Management [ edit ] injection of methotrexate This section is empty.
Pustular psoriasis is a rare form of psoriasis that is characterized by widespread pustules and reddish skin. This condition can occur alone or with plaque-type psoriasis . Most cases of pustular psoriasis are thought to be " multifactorial " or associated with the effects of multiple genes in combination with lifestyle and environmental factors. There are several triggers for this conditions including withdrawal from corticosteroids, exposure to various medications and/or infections. Some cases of the generalized form are caused by changes (mutations) in the IL36RN gene and are inherited in an autosomal recessive pattern. In severe cases, hospitalization may be required. Treatment aims to alleviate the associated symptoms and may include certain medications and/or phototherapy.
Relationship between noise exposure levels and duration of allowable exposure at that level for NIOSH and OSHA The NIOSH Sound Level Meter app Sound level meters and dosimeters are two types of devices that are used to measure sound levels in the workplace. ... Some recent studies suggest that some smartphone applications may be able to measure noise as precisely as a Type 2 SLM. [15] [16] Although most smartphone sound measurement apps are not accurate enough to be used for legally required measurements, the NIOSH Sound Level Meter app met the requirements of IEC 61672/ANSI S1.4 Sound Level Meter Standards (Electroacoustics - Sound Level Meters - Part 3: Periodic Tests). [17] Ototoxic chemical exposure [ edit ] Chemically-induced hearing loss (CIHL) is a potential result of occupational exposures. ... "Evaluation of smartphone sound measurement applications (apps) using external microphones-A follow-up study" . ... "Smartphone-based sound level measurement apps: Evaluation of compliance with international sound level meter standards". ... Occupational hearing loss (2nd ed.). New York: M. Dekker. ISBN 978-0-8247-8814-8 . ^ Al-Otaibi ST (June 2000).
A rare X-linked syndromic intellectual disability characterized by a variable clinical picture including developmental delay, mild to moderate intellectual disability, learning difficulties, communication deficits, and behavioral problems (such as aggression, attention deficit, hyperactivity, and autistic features). Personality disorder and psychotic behavior have also been reported.
Fragile XE syndrome is a genetic disorder that impairs thinking ability and cognitive functioning. Most affected individuals have mild intellectual disability. In some people with this condition, cognitive function is described as borderline, which means that it is below average but not low enough to be classified as an intellectual disability. Females are rarely diagnosed with fragile XE syndrome, likely because the signs and symptoms are so mild that the individuals function normally. Learning disabilities are the most common sign of impaired cognitive function in people with fragile XE syndrome. The learning disabilities are likely a result of communication and behavioral problems, including delayed speech, poor writing skills, hyperactivity, and a short attention span.
A number sign (#) is used with this entry because this form of X-linked mental retardation is caused by disruption of the FMR2 gene (AFF2; 300806), either by expansion of a CCG repeat in the 5-prime untranslated region or by deletion. Description FRAXE mental retardation is a form of mild to moderate mental retardation associated with learning difficulties, communication deficits, attention problems, hyperactivity, and autistic behavior (summary by Bensaid et al., 2009). FRAXE is associated with a fragile site on chromosome Xq28 and is the cause of nonsyndromic X-linked mental retardation in 1 of 50,000 newborn males. The disorder can be caused either by silencing of the FMR2 gene as a consequence of a CCG expansion located upstream of this gene or by deletion within the gene (Stettner et al., 2011). Clinical Features Knight et al. (1996) provided clinical details of 1 FRAXE male identified through a screening study as well as 3 other FRAXE individuals identified through previous referrals for fragile X syndrome testing.
Fragile XE syndrome (FRAXE) is a genetic condition associated with mild to borderline intellectual disabilities with physical features differing from person to person. The characteristic features are learning difficulties, often a consequence of communication problems (speech delay, poor writing skills), hyperactivity, and a shortened attention span. Nearly all cases of FRAXE are caused by a specific type of mutation, called a trinucleotide repeat expansion , in the AFF2 gene, which is located on the X chromosome. A trinucleotide repeat expansion occurs when there is an abnormally large number of repeats of a specific sequence of three nucleotides (building block of DNA) within our DNA. The repeating nucleotides in FRAXE syndrome are CCG. When the number of CCG repeats is over 200, people typically have the signs and symptoms seen in FRAXE.
These substances have been used for dancing, socializing, communal celebration and other purposes. [21] The rise of online websites and hookup apps in the 1990s gave men new ways of cruising and meeting sexual partners, including the ability to arrange private sexual gatherings in their homes. [22] From the early 2000s, historic venues of gay socialization such as bars, clubs, and dance events reduced in number in response to a range of factors, including gentrification, zoning laws, licensing restrictions, and the increased number of closeted or under the influence sexually labile men, and the increasing popularity of digital technologies for sexual and social purposes. [23] In this context, PNP emerged as an alternative form of sexualized partying that enabled participants to avoid the public scrutiny and potentially judgmental and anxiety provoking nature of the "public space". ... In some instances, PNP sessions play a part in the formation of loose social networks that are valued and relied upon by participants. [22] For other men, increasing reliance on hookup apps and websites to arrange sex may result in a sense of isolation that may exacerbate the risk of drug dependence, especially in the context of a lack of other venues for gay socializing and sexual community-formation. [23] A 2014 study found that one of the key reasons for taking drugs before and during sex was to boost sexual confidence and reduce feelings of self-doubt, regarding feelings of "internalised homophobia" from society, concerns about an HIV diagnosis, or "guilt related to having or desiring gay sex". A key self-confidence issue for study participants was "body image", a concern that was heightened by the focus on social networking apps on appearance, because on these apps, there is a focus on idealized male bodies that are "toned and muscular". ... Addict Behav . 29 (1): 89–106. doi : 10.1016/S0306-4603(03)00082-0 . PMID 14667423 . ^ "ChemSex and hepatitis C: a guide for healthcare providers" (PDF) .
Fragile X syndrome is a genetic condition involving changes in part of the X chromosome. This condition causes a range of developmental problems including learning disabilities and cognitive impairment. It is the most common form of inherited intellectual disability in males and a significant cause of intellectual disability in females. Other signs and symptoms may include symptoms of autism spectrum disorders , seizures, and characteristic physical features. Fragile X syndrome is caused by a change (mutation) in the FMR1 gene and is inherited in an X-linked dominant manner.
A rare genetic disease associated with mild to severe intellectual deficit that may be associated with behavioral disorders and characteristic physical features including a high forehead, prominent and large ears, hyperextensible finger joints, flat feet with pronation and, in adolescent and adult males, macroorchidism. Epidemiology Prevalence is estimated at approximately 1/2400-1/6000 although the prevalence may vary, depending on where the screening is carried out in the world. Clinical description Fragile X syndrome (FXS) presents with a variable clinical phenotype. In males, the disease presents during childhood with delayed developmental milestones. Intellectual deficit can be of variable severity and may include problems with working and short-term memory, executive function, language, mathematics and visuospatial abilities.
Among the sons, the probability for mental impairment is 0.38, 0.5, and 0, respectively, and the chance of a son being a mentally normal carrier is 0.12, 0, and 0, respectively. Among the daughters, the risk of being a mentally impaired carrier is 0.16, 0.28, and 0, respectively, and the chance of being a mentally normal carrier is about 0.34, 0.22, and 1.0, respectively. ... In 14 families with fragile X and 9 normal pedigrees from the CEPH collection, Thibodeau et al. (1988) also observed genetic heterogeneity between the fragile X locus and the F9 locus, with recombination frequencies of DXS51-F9, 0%; F9-DXS52, 45%; DXS51-FRAXA, 15%; F9-FRAXA, 18%; DXS98-FRAXA, 36%; and DXS52-FRAXA, 15%.
Based on the region in which they were first described, the subtypes include: The Dutch , Arctic , Piedmont , Iowa , Flemish , Italian types are caused by mutations in the APP gene The British and Danish types are caused by mutations in the ITM2B gene The Icelandic type is caused by mutations in the CST3 gene All types of HCHWA currently described are inherited in an autosomal dominant manner.
A critical piece of evidence indicating a difference between the 2 diseases is the finding by van Duinen et al. (1987) that in the Dutch form of the disease the vascular amyloid deposits have immunohistochemical characteristics of Alzheimer disease-related beta-protein (APP; 104760). Molecular Genetics In Icelandic patients with hereditary cerebral hemorrhage with amyloidosis, Abrahamson et al. (1987) identified a heterozygous mutation in the CST3 gene (L68Q; 604312.0001).
Etiology Most forms of HCHWA (Dutch, Arctic, Piedmont, Iowa, Flemish and Italian) are due to a point-mutation in the APP gene on chromosome 21q21.2, which encodes the beta-amyloid precursor protein.
Abnormalities in each of these identified clearance pathways have been linked to CAA. [12] [13] In familial forms of CAA, the cause of Aβ build up is likely due to increased production rather than poor clearance. [14] Mutations in the amyloid precursor protein (APP), Presenilin (PS) 1 and PS2 genes can result in increased rates of cleavage of the APP into Aβ. ... External links [ edit ] Classification D ICD - 10 : I68.0 MeSH : D016657 DiseasesDB : 32874 External resources MedlinePlus : 000719 eMedicine : neuro/628 Scholia has a topic profile for Cerebral amyloid angiopathy . v t e Amyloidosis Common amyloid forming proteins AA ATTR Aβ2M AL Aβ / APP AIAPP ACal APro AANF ACys ABri Systemic amyloidosis AL amyloidosis AA amyloidosis Aβ2M/Haemodialysis-associated AGel/Finnish type AA/Familial Mediterranean fever ATTR/Transthyretin-related hereditary Organ-limited amyloidosis Heart AANF/Isolated atrial Brain Familial amyloid neuropathy ACys+ABri/Cerebral amyloid angiopathy Aβ/Alzheimer's disease Kidney AApoA1+AFib+ALys/Familial renal Skin Primary cutaneous amyloidosis Amyloid purpura Endocrine Thyroid ACal/Medullary thyroid cancer Pituitary APro/Prolactinoma Pancreas AIAPP/Insulinoma AIAPP/Diabetes mellitus type 2 v t e Medicine Specialties and subspecialties Surgery Cardiac surgery Cardiothoracic surgery Colorectal surgery Eye surgery General surgery Neurosurgery Oral and maxillofacial surgery Orthopedic surgery Hand surgery Otolaryngology ENT Pediatric surgery Plastic surgery Reproductive surgery Surgical oncology Transplant surgery Trauma surgery Urology Andrology Vascular surgery Internal medicine Allergy / Immunology Angiology Cardiology Endocrinology Gastroenterology Hepatology Geriatrics Hematology Hospital medicine Infectious disease Nephrology Oncology Pulmonology Rheumatology Obstetrics and gynaecology Gynaecology Gynecologic oncology Maternal–fetal medicine Obstetrics Reproductive endocrinology and infertility Urogynecology Diagnostic Radiology Interventional radiology Nuclear medicine Pathology Anatomical Clinical pathology Clinical chemistry Cytopathology Medical microbiology Transfusion medicine Other Addiction medicine Adolescent medicine Anesthesiology Dermatology Disaster medicine Diving medicine Emergency medicine Mass gathering medicine Family medicine General practice Hospital medicine Intensive care medicine Medical genetics Narcology Neurology Clinical neurophysiology Occupational medicine Ophthalmology Oral medicine Pain management Palliative care Pediatrics Neonatology Physical medicine and rehabilitation PM&R Preventive medicine Psychiatry Addiction psychiatry Radiation oncology Reproductive medicine Sexual medicine Sleep medicine Sports medicine Transplantation medicine Tropical medicine Travel medicine Venereology Medical education Medical school Bachelor of Medicine, Bachelor of Surgery Bachelor of Medical Sciences Master of Medicine Master of Surgery Doctor of Medicine Doctor of Osteopathic Medicine MD–PhD Related topics Alternative medicine Allied health Dentistry Podiatry Pharmacy Physiotherapy Molecular oncology Nanomedicine Personalized medicine Public health Rural health Therapy Traditional medicine Veterinary medicine Physician Chief physician History of medicine Book Category Commons Wikiproject Portal Outline
