Founder effects for ATM gene mutations in Italian Ataxia Telangiectasia families.

Abstract:

:We screened ATM gene mutations in 104 Italian Ataxia-Telangiectasia patients from 91 unrelated families (detection rate 90%) and found 21 recurrent mutations in 63 families. The majority (67%) of patients were compound heterozygotes, while 33% were homozygotes. To determine the existence of common haplotypes and potential founder effects, we analyzed five microsatellite markers within and flanking the ATM gene. Haplotype analysis was carried out in 48/63 families harbouring 16 of the 21 recurrent mutations. Forty different haplotypes were detected in the 48 A-T families studied. We found that the majority of patients with the same recurrent mutation originated from the same geographical area. All but one recurrent mutation analyzed displayed a common haplotype suggesting a single origin that then spread to different geographical areas. The high number of different haplotypes does not allow the screening of ATM mutations by haplotype analysis alone in the Italian population. The finding of recurrent public mutations without founder effect suggests the existence of 'mild' hot spots of mutation located along the sequence of the ATM gene.

journal_name

Ann Hum Genet

journal_title

Annals of human genetics

authors

Chessa L,Piane M,Magliozzi M,Torrente I,Savio C,Lulli P,De Luca A,Dallapiccola B

doi

10.1111/j.1469-1809.2009.00535.x

subject

Has Abstract

pub_date

2009-09-01 00:00:00

pages

532-9

issue

Pt 5

eissn

0003-4800

issn

1469-1809

pii

AHG535

journal_volume

73

pub_type

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