Meiotic disjunction in t(14;15)6ca heterozygotes and fate of chromosomally unbalanced gametes in embryonic development.

Cytogenetics and Cell Genetics
M Oshimura, N Takagi

Abstract

In heterozygous carriers of the mouse reciprocal translocation T(14;15)6Ca, the frequency of nondisjunction involving the minute marker chromosome was 4.4% in the male and 22.2% in the female. The fate of gametes with unbalanced genomes derived from normal as well as abnormal meiotic disjunction in T6 heterozygotes was investigated on the basis of chromosome counts at metaphase II and karyotype analyses in early postimplantation embryos produced by backcrossing with chromosomally normal animals. Results obtained indicate that meiotic, gametic, and zygotic selection attributable to specific types of chromosomal imbalances is minimal, if any, by the late blastocyst stage. All zygotes with unbalanced genomes, except those with 20 normal pairs plus the minute marker, however, die off in the latter half of pregnancy. Therefore, the increased incidence of translocation trisomics among progeny of female as compared with male heterozygotes reflects the higher incidence of nondisjunction in primary oocytes than in spermatocytes.

Citations

Jan 1, 1996·Chromosome Research : an International Journal on the Molecular, Supramolecular and Evolutionary Aspects of Chromosome Biology·C Tease
Sep 1, 1981·Journal of Reproductive Immunology·R P EricksonM Butley
Sep 24, 1999·Biology of Reproduction·F MarchettiA J Wyrobek
Jul 22, 2005·Birth Defects Research. Part C, Embryo Today : Reviews·Francesco Marchetti, Andrew J Wyrobek
Sep 1, 1976·Clinical Genetics·J G Lauritsen, U Friedrich

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