The apolipoprotein E/CI/CII gene cluster and late-onset Alzheimer disease.

Abstract:

:The chromosome 19 apolipoprotein E/CI/CII gene cluster was examined for evidence of linkage to a familial Alzheimer disease (FAD) locus. The family groups studied were Volga German (VG), early-onset non-VG (ENVG; mean age at onset < 60 years), and late-onset families. A genetic association was observed between apolipoprotein E (ApoE) allele epsilon 4 and FAD in late-onset families; the epsilon 4 allele frequency was .51 in affected subjects, .37 in at-risk subjects, .11 in spouses, and .19 in unrelated controls. The differences between the epsilon 4 frequencies in affected subjects versus controls and in at-risk subjects versus controls were highly significant (standard normal deviate [ZSND]) = 7.37, P < 10(-9); and ZSND = 4.07, P < .00005, respectively). No association between the epsilon 4 allele and FAD was observed in the ENVG or VG groups. A statistically significant allelic association between epsilon 4 and AD was also observed in a group of unrelated subjects; the epsilon 4 frequency was .26 in affected subjects, versus .19 in controls (ZSND = 2.20, P < .03). Evidence of linkage of ApoE and ApoCII to FAD was examined by maximum-likelihood methods, using three models and assuming autosomal dominant inheritance: (1) age-dependent penetrance, (2) extremely low (1%) penetrance, and (3) age-dependent penetrance corrected for sporadic Alzheimer disease (AD). For ApoCII in late-onset families, results for close linkage were negative, and only small positive lod-score-statistic (Z) values were obtained (model 1, maximum Z[Zmax] = 0.61, recombination fraction [theta] = .30; model 2, Zmax = 0.47, theta = .20). For ApoE in late-onset kindreds, positive Z values were obtained when either allele frequencies from controls (model 1, Zmax = 2.02, theta = .15; model 2, Zmax = 3.42, theta = .05) or allele frequencies from the families (model 1, Zmax = 1.43, theta = .15; model 2, Zmax = 1.70, theta = .05) were used. When linkage disequilibrium was incorporated into the analysis, the Z values increased (model 1, Zmax = 3.17, theta = .23; model 3, Zmax = 1.85, theta = .20). For the ENVG group, results for ApoE and ApoCII were uniformly negative. Affected-pedigree-member analysis gave significant results for the late-onset kindreds, for ApoE (ZSND = 3.003, P = .003) and ApoCII (ZSND = 2.319, P = .016), when control allele frequencies were used but not when allele frequencies were derived from the families.

journal_name

Am J Hum Genet

authors

Yu CE,Payami H,Olson JM,Boehnke M,Wijsman EM,Orr HT,Kukull WA,Goddard KA,Nemens E,White JA

subject

Has Abstract,Author List Incomplete

pub_date

1994-04-01 00:00:00

pages

631-42

issue

4

eissn

0002-9297

issn

1537-6605

journal_volume

54

pub_type

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