Chromosomal break points in irradiated and ethyl methane sulphonate treated leucocytes of patients with Down syndrome.
Frequencies of chromosomal damage in the peripheral leucocytes of patients with Down syndrome, on exposure to gamma rays (2Gy) or ethyl methane sulphonate (EMS, 1x 10(-4) M), were assessed. Analysis of break points in the chromosomes of irradiated cells revealed a non-random occurrence. Six of the break points observed in EMS-treated cells were found to overlap with those recorded in irradiated cells. Thirteen break points observed were found to correlate with the location of cancer-specific break points and four of these coincided with the bands where oncogenes have been located. Two break points were localised to the same bands as that of known heritable fragile sites.
Department of Genetics, Dr A.L.M. Post Graduate Institute of Basic Medical Sciences, University of Madras, Taramani.
T C
TC
Reeja
N
N
Chandra
K M
KM
Marimuthu
D002869:Chromosome Aberrations; D043283:Chromosome Fragile Sites; D002873:Chromosome Fragility; D004314:Down Syndrome / Q000235:genetics*; D005020:Ethyl Methanesulfonate / Q000494:pharmacology; D006801:Humans; D066298:In Vitro Techniques; D007962:Leukocytes / Q000187:drug effects / Q000528:radiation effects / Q000648:ultrastructure
D005020:Ethyl Methanesulfonate