Nonrandom chromosome changes in methylnitrosourea (MNU) induced mouse T-cell lymphomas.
Since nonrandom chromosome changes in neoplastic cells have proven to be good indicators of the site of gene alterations related to transformation, the authors examined the chromosomes of T-cell lymphomas induced in RF/J strain mice with methylnitrosourea (MNU). All treated mice developed thymic lymphomas within 10 weeks of injection. Chromosomes of the thymus cells were examined at intervals before and during lymphoma development, as well as after they were passaged in syngeneic and in nude mice for periods up to 424 days. In preparations made directly from the thymus cells nonrandom numerical and structural alterations were found that involved the X, 3, 15, 4, 8, 12, 14 and 17. (Chromosomes showing alterations are listed in decreasing order of the frequency of their occurrence). In cells passaged in nude mice the chromosomes similarly altered were the 10, X, 3, 12, 6, 1, 4, 19, 15, 18 and 14. In tumor cells passaged in syngeneic mice most of the same chromosomes were involved but the order was 15, 14, X, 1, 5, 6, 3, 11 and 12. The X, 15, 14, 3 and 12 were aberrant in both direct preparations and in those from passaged cells, suggesting that these chromosomes carry genes which, when altered, are particularly important in the multistep process of neoplastic transformation. Most of these chromosomes, or their homologs in other species, have been found to be involved frequently in several different cancers of mice and men, as for example the region on the mouse 15 carrying the Myc and Pvt-1 genes.(ABSTRACT TRUNCATED AT 250 WORDS)
Kaelbling
M
M
Department of Molecular Genetics, Albert Einstein College of Medicine, Bronx, New York 10461.
Zhang
Y D
YD
Dasgupta
U B
UB
Lilly
F
F
Klinger
H P
HP
D000818:Animals; D002869:Chromosome Aberrations / Q000139:chemically induced*; D025063:Chromosome Disorders; D005260:Female; D007621:Karyotyping; D016399:Lymphoma, T-Cell / Q000139:chemically induced / Q000235:genetics*; D008770:Methylnitrosourea; D051379:Mice; D008815:Mice, Inbred Strains; D008819:Mice, Nude; D013950:Thymus Gland / Q000166:cytology / Q000187:drug effects
D008770:Methylnitrosourea