Higher incidence of small Y chromosome in humans with trisomy 21 (Down syndrome).

Abstract:

:The length of the Y chromosome was measured in 42 black patients with trisomy 21 (47,XY,+21) and a similar number of normal individuals of American black ancestry. The length of the Y was expressed as a function of Y/F ratio and arbitrarily classified into five groups using subjectively defined criteria as follows: very small, small, average, large, and very large. Thirty-eight % of the trisomy 21 patients had small or very small Ys compared to 2.38% of the controls (P less than 0.01). In both populations the size of the Y was not normally distributed. In the normals it was skewed to the left, whereas in the Downs the distribution was flat (platykurtic). A significantly higher incidence of Y length heteromorphisms was noted in the Down as compared to the normal black population. In the light of our current understanding that about one-third of all trisomy 21 patients are due to paternal nondisjunction, it may be tempting to speculate that males with small Y are at an increased risk for nondisjunction of the 21 chromosome.

journal_name

Pediatr Res

journal_title

Pediatric research

authors

Verma RS,Huq A,Madahar C,Qazi Q,Dosik H

doi

10.1203/00006450-198209000-00012

subject

Has Abstract

pub_date

1982-09-01 00:00:00

pages

769-70

issue

9

eissn

0031-3998

issn

1530-0447

journal_volume

16

pub_type

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