title: Apolipoprotein E and presenilin-1 allelic variation and Alzheimer's disease in India.
abstract: As part of a larger epidemiological survey to study the prevalence of dementia in a suburb of Mumbai, Western India, we identified 78 cases with a Clinical Dementia Rating (CDR) > or = 1.0. Of these, 49 Alzheimer's disease (AD) cases were analyzed for risk association with APOE E*4 allele at apolipoprotein E gene (APOE) and presenilin-1 (PS-1) intron-8 polymorphism and were compared with 100 age- and sex-matched nondemented controls. Genotype analysis confirmed the association of APOE E*4 allele with AD as has been reported by various studies. We report a low frequency of APOE E*4 allele, consistent with a low prevalence of AD in this study. Comparisons with other similar studies on APOE from India suggest common risk factors for AD in the Indian population, which is diverse in its ethnic and racial characteristics. The frequency for allele 1 at PS-1 intron-8 polymorphism is the highest among all studies reported. This first report of PS-1 intron-8 polymorphism and AD from India demonstrates no significant association.
authors.affiliation: Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad 500 007, India.
authors.forename: G R
authors.initials: GR
authors.lastname: Chandak
authors.forename: M Uma
authors.initials: MU
authors.lastname: Sridevi
authors.forename: C J
authors.initials: CJ
authors.lastname: Vas
authors.forename: D M
authors.initials: DM
authors.lastname: Panikker
authors.forename: L
authors.initials: L
authors.lastname: Singh
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000483:Alleles; D000544:Alzheimer Disease / Q000175:diagnosis / Q000453:epidemiology / Q000235:genetics*; D053327:Apolipoprotein E4; D001057:Apolipoproteins E / Q000235:genetics*; D016022:Case-Control Studies; D005820:Genetic Testing; D014644:Genetic Variation / Q000235:genetics*; D005828:Genetics, Population; D005838:Genotype; D006801:Humans; D007194:India / Q000453:epidemiology; D007438:Introns / Q000235:genetics; D008565:Membrane Proteins / Q000235:genetics*; D008609:Mental Status Schedule; D008875:Middle Aged; D011110:Polymorphism, Genetic / Q000235:genetics*; D053764:Presenilin-1; D015995:Prevalence; D012307:Risk Factors
chemical_list: D053327:Apolipoprotein E4; D001057:Apolipoproteins E; D008565:Membrane Proteins; C508853:PSEN1 protein, human; D053764:Presenilin-1