Comparative study of radiation-induced G2 phase delay and chromatid damage in families with ataxia-telangiectasia
| Autor: | Aine Farrell, Karen Hobson, Adeeb A. Girjes, Martin F. Lavin, Philip Chen |
|---|---|
| Rok vydání: | 1994 |
| Předmět: |
Adult
G2 Phase Male Cancer Research Time Factors Chromatids Biology Flow cytometry Ataxia Telangiectasia Genetics medicine Humans Child Molecular Biology Gene Cells Cultured Aged Chromosome Aberrations Obligate medicine.diagnostic_test Chromosome Heterozygote advantage Middle Aged Cell cycle medicine.disease Molecular biology Pedigree Child Preschool Ataxia-telangiectasia Female Chromatid |
| Zdroj: | Cancer Genetics and Cytogenetics. 76:43-46 |
| ISSN: | 0165-4608 |
| DOI: | 10.1016/0165-4608(94)90069-8 |
| Popis: | Two assay systems, radiation-induced chromosome aberrations and flow cytometry, were compared for the detection of ataxia-telangiectasia (A-T) heterozygotes. In three A-T families, the frequencies of chromatid aberrations in phytohemagglutinin-stimulated blood lymphocytes after 1 Gy of gamma-irradiation were twofold higher in A-T homozygotes than in obligate A-T heterozygotes, which were in turn approximately twofold higher than in normal control cells. Other consanguineous relatives of A-T patients had intermediate levels of induced chromatid aberrations, suggesting that they were carriers of the gene. Matched Epstein-Barr virus—transformed lymphoblastoid cell lines from A-T homozygotes showed a greater radiation-induced accumulation in the G2 phase of the cell cycle than did control cells. In family B, both obligate heterozygotes had increased G2 delay, as did the one heterozygote available for family C, and two of the grandparents in that family were in the high range for G2 delay. Neither parent in family A had high G2 phase delay after irradiation although the induced chromatid aberrations were in the heterozygote valve range. These results show a good concordance between the two assay systems for A-T heterozygotes, with the chromatid aberrations somewhat more consistent. |
| Databáze: | OpenAIRE |
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