Sex Chromatin

Sex chromatin of hydatidiform moles.

The placenta is a homograft which is tolerated by the host for an unusually long time. The hydatidiform mole may be said to be even more successful in this respect for it can survive longer and penetrate further in the host even in the absence of a viable foetus. Recent observations that a large number of hydatidiform moles are chromatin positive are of much interest, but so far the reported se...

Ancestral Chromatin Configuration Constrains Chromatin Evolution on Differentiating Sex Chromosomes in Drosophila

Sex chromosomes evolve distinctive types of chromatin from a pair of ancestral autosomes that are usually euchromatic. In Drosophila, the dosage-compensated X becomes enriched for hyperactive chromatin in males (mediated by H4K16ac), while the Y chromosome acquires silencing heterochromatin (enriched for H3K9me2/3). Drosophila autosomes are typically mostly euchromatic but the small dot chromos...

A survey of sex chromatin abnormalities in mental hospitals.

Sex chromatin surveys have shown that an additional X chromosome is present in some or all of the cells of about 1 in 500 newborn males and of about 1 in 1000 newborn females, and that these anomalies may be 4-5 times commoner in inmates of mental deficiency institutions. The present survey was undertaken to determine the frequency of X chromosome abnormalities in patients with other mental dis...

Sex chromatin survey in mentally handicapped children in Mexico.

Sex chromatin studies in institutions for mentally handicapped children show a considerably higher frequency of abnormalities as compared with observations on the general population. The published material is summarized in Table I. The present research was undertaken in order to determine the frequency of possible X chromosome numerical aberrations, by means of a sex chromatin study, in a group...

A sex chromatin study of Chinese school children.