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. 1986 Dec;39(6):787–796.

Inverted duplication of JH associated with chromosome 14 translocation and T-cell leukemia in ataxia-telangiectasia.

J P Johnson, R A Gatti, T S Sears, R L White
PMCID: PMC1684115  PMID: 3026175

Abstract

A specific 14q32 breakpoint is observed in a homologous chromosome 14 translocation [t(14;14)q12q32] occurring in the T-cells of about 10% of patients with ataxia-telangiectasia (AT). To investigate whether the 14q32 breakpoint in AT occurs within the immunoglobulin gene cluster as is frequently detected in B-cell lymphoma, immunoglobulin clones were hybridized to Southern blots of DNA isolated from the T-cells of two AT patients with this chromosome 14 translocation. The 14q32 translocation breakpoints in these patients are apparently not within JH, S mu, C mu, S alpha-1 or -2, or C alpha-1 or -2, but one of the patients has an inverted duplication of at least 26 kilobases (kb) of the C mu region, with an associated 5' flanking deletion. The point of origin of the inverted duplication is within JH near the recombination signal for the J4 gene. This suggests that normal JH recombination mechanisms may have played a role in the development of this 14q32 chromosomal aberration. The presence of AT chromosomal breakpoints near other rearranging genes suggests a role for exaggerated recombination in the pathogenesis of chromosomal instability in AT.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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