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Murine radiation myeloid leukaemogenesis: Relationship between interstitial telomere‐like sequences and chromosome 2 fragile sites
Author(s) -
Bouffler Simon,
Silver Andy,
Papworth David,
Coates Julia,
Cox Roger
Publication year - 1993
Publication title -
genes, chromosomes and cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.754
H-Index - 119
eISSN - 1098-2264
pISSN - 1045-2257
DOI - 10.1002/gcc.2870060206
Subject(s) - telomere , chromosomal fragile site , biology , chromosome , genetics , breakpoint , dicentric chromosome , microbiology and biotechnology , cytogenetics , subtelomere , karyotype , dna , gene
While the specific nature of chromosomal fragile sites and their relationship to human leukaemogenesis remain obscure, there is evidence that chromosomal fragility may, in some circumstances, be associated with telomere‐like repeat sequences and that chromosome 2 fragility in the mouse is involved in the initiation of myeloid leukaemia by ionising radiation. Here we describe the molecular cloning and characterisation of two murine telomere‐like sequences, one having an inverted repeat structure and the other a simple tandem repeat organisation. The inverted telomere repeat clone generates an in situ chromosome 2 hybridisation pattern very similar to the distribution of the radiation‐sensitive fragile sites previously found to be associated with leukaemogenic initiation. Furthermore, statistical comparison of the distributions of radiation induced breakpoints and sites of inverted telomere repeat hybridization indicates concordance at all chromosome 2 sites excluding the terminal regions. These data are discussed with respect to mechanisms of radiation‐induced, site‐specific chromosome 2 rearrangement and their implications for leukaemogenic initiation. © 1993 Wiley‐Liss, Inc.