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Association of the mitochondrial tRNA(A4336G) mutation with Alzheimer's and Parkinson's diseases.

Abstract：

:Alzheimer's and Parkinson's diseases (AD, PD) are among the most common neurodegenerative disorders in adults. Both AD and PD have a complex aetiology, and it is widely considered that genetic factors, acting independently or in concert with other genetic and/or environmental factors, modify the risk of developing them. While the apolipoprotein E (ApoE) epsilon 4 allele represents an established risk factor for familial and sporadic late-onset AD, it has been suggested that a common polymorphism in the alpha 1-antichymotrypsin gene modifies the ApoE epsilon 4 dosage effect in AD. Moreover, it has been proposed that a mitochondrial tRNA(Gln) sequence variant (A4336G transition) confers an increased risk for both AD and PD. This finding is of particular interest as the A4336G mutation seems to predispose to two clinically and neuropathologically distinct neurodegenerative disorders. We have examined the allelic frequencies of these putative susceptibility genes in 28 neuropathologically confirmed cases of AD, 23 cases with Lewy-body PD and 100 age-matched controls without clinical or histological evidence of neurodegenerative disease. The ApoE epsilon 4 allele frequency was significantly overrepresented in AD patients vs controls (0.35 vs 0.11) but we could not find evidence for an association between the alpha 1-antichymotrypsin AA genotype, the ApoE epsilon 4 allele and AD. In contrast, the mtDNA(A4336G) mutation was present in one of AD cases and in two of 23 PD patients, whereas no mutation was found in 100 age-matched controls (P < 0.05). Our data therefore support the hypothesis that the mitochondrial A4336G mutation represents a risk factor for AD and PD.

journal_name

Neuropathol Appl Neurobiol

journal_title

Neuropathology and applied neurobiology

authors

Egensperger R,Kösel S,Schnopp NM,Mehraein P,Graeber MB

subject

Has Abstract

pub_date

1997-08-01 00:00:00

pages

315-21

issue

4

eissn

0305-1846

issn

1365-2990

journal_volume

23

pub_type

杂志文章

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