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 Genetjournal_title
Human geneticsauthors
Tchirkov A,Bay JO,Pernin D,Bignon YJ,Rio P,Grancho M,Kwiatkowski F,Giollant M,Malet P,Verrelle Pdoi
10.1007/s004390050634subject
Has Abstractpub_date
1997-12-01 00:00:00pages
312-6issue
3eissn
0340-6717issn
1432-1203journal_volume
101pub_type
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