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1: Hum Genet. 1978 Aug 31;43(2):211-4.Links

Incidence of 47,XYY karyotype in a consecutive series of newborn males in Tokyo.

Iijima K, Higurashi M, Hirayama M.

A series of 3545 newborn males, born consecutively at a maternity hospital in the western suburbs of Tokyo and with no detectable physical abnormalities, were studied for fluorescent Y-chromatin. Buccal cell smears from each infant were screened. Cases with ambiguous results were subjected to a second test by blood smears, which were found to be more reliable. After the second test, chromosomal analysis was carried out in five infants: three had a 47,XYY karyotype; one, the karyotype 46,XY-D,t(D:Y) (Iijima et al., in preparation); and one, a normal male karyotype. The XYY karyotype occurred in 0.11% of newborn males in this series.

PMID: 689687 [PubMed - indexed for MEDLINE]