Detection of heterozygous carriers of the ataxia-telangiectasia (ATM) gene by G2 phase chromosomal radiosensitivity of peripheral blood lymphocytes.

Abstract:

:In ataxia-telangiectasia (A-T) patients, mutations in a single gene, ATM, result in an autosomal recessive syndrome that embraces a variety of clinical features and manifests extreme radiosensitivity and a strong pre-disposition to malignancy. Heterozygotes for the ATM gene have no clinical expression of A-T but may be cancer prone with a moderate increase in in vitro radiosensitivity. We performed a blind chromosomal analysis on G2-phase lymphocytes from 7 unrelated A-T patients, 13 obligate A-T heterozygotes (parents of the patients), and 14 normal controls following X-irradiation with 1 Gy in order to evaluate this cytogenetic method as a tool for detection of ATM carriers. Both A-T homozygotes and heterozygotes showed significantly increased levels of radiation-induced chromatid damage relative to that of normal controls. These results show that the G2-phase chromosomal radiosensitivity assay can be used for the detection of A-T heterozygotes. In combination with molecular genetic analyses, this test may be of value in studies of familial and sporadic cancers aimed at determination of the potential involvement of ATM mutations in tumor risk or development.

journal_name

Hum Genet

journal_title

Human genetics

authors

Tchirkov A,Bay JO,Pernin D,Bignon YJ,Rio P,Grancho M,Kwiatkowski F,Giollant M,Malet P,Verrelle P

doi

10.1007/s004390050634

subject

Has Abstract

pub_date

1997-12-01 00:00:00

pages

312-6

issue

3

eissn

0340-6717

issn

1432-1203

journal_volume

101

pub_type

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