Breakpoints and junctional regions of intragenic deletions in the HPRT gene in human T-cells

Journal Article · Fri Sep 01 04:00:00 EDT 1995 · Somatic Cell and Molecular Genetics

DOI:https://doi.org/10.1007/BF02257466· OSTI ID:241180

Rainville, I R; Albertini, R J; Nicklas, J A ^[1]

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1. Univ. of Vermont, Burlington, VT (United States)

DNA sequences of the deletion breakpoints of 24 human T-lymphocyte hprt gene mutations are reported. These independent deletions ranged in size from 18 to 15655 base pairs. Seven of the 21 in vivo mutations arose in normal adults, three in normal children, eight in radioimmunotherapypatients and three in platinum chemotherapypatients. One in vitro mutation was isolated after 93cGy radon exposure and two after 300cGy {gamma}radiation. The breakpoints were found to be non-random and a cluster of small deletions in exon 6 is reported. Ten of the mutations had 2-5bp direct repeats at the breakpoints. There was no excess of {open_quotes}deletion-associated{close_quotes} motifs over that expected by chance. Some breakpoints do occur at consensus topoisomerase II cleavage sites and the centromeric end of a Donehower sequence occurs exactly at a telomeric breakpoint. Three mutants had breakpoints at hairpins expected by the model of Glickman and Ripley. 86 refs., 5 figs., 3 tabs.

• Sponsoring Organization: USDOE
• OSTI ID: 241180
• Journal Information: Somatic Cell and Molecular Genetics, Journal Name: Somatic Cell and Molecular Genetics Journal Issue: 5 Vol. 21; ISSN 0740-7750; ISSN SCMGDN
• Country of Publication: United States
• Language: English

Related Subjects

56 BIOLOGY AND MEDICINE
APPLIED STUDIES
CHEMOTHERAPY
CHROMOSOMAL ABERRATIONS
GAMMA RADIATION
GENES
GENETIC EFFECTS
GENETIC RADIATION EFFECTS
HYPOXANTHINE PHOSPHORIBOSYLTRANSFERASE
MAN
RADON