An XY/XYY Mosaic Cynomolgus Monkey (Macaca fascicularis)

Abstract

In the course of a cytogenetic population survey of the cynomolgus monkeys in the breeding colony of the Tsukuba Primate Center for Medical Science, we found a phenotypically normal male with an XY/XYY mosaic sex-chromosome condition. The mosaic sex-chromosome complement was observed in cultured lymphocytes, kidney cells and spermatogenial cells. However, no such mosaicism was detected in spermatocytes.