Late Replicating X Chromosomes in Human Triploidy

Overview

Journal Am J Hum Genet

Publisher Cell Press

Specialty Genetics

Date 1979 Jul 1

PMID 484553

Citations 8

Authors

P A Jacobs

A M Matsuyama

I M Buchanan

C Wilson

Affiliations

Soon will be listed here.

Abstract

The status of X-chromosome replication was studied in twenty-seven 69,XXY and nine 69,XXX human triploids in which the parental origin of the additional haploid set was known from the study of chromosome heteromorphisms. Among the 69,XXY triploids, fourteen had no late replicating X, two had one late replicating X in all cells examined, and eleven had two populations of cells, one with late replicating X chromosome, and one without any. Among the 69,XXX triploids, four had a single late replicating X, and five had two populations of cells, one with one late replicating X, and one with two late replicating X chromosomes. There was no correlation between the parental origin of the triploidy and the type of X-chromosome inactivation. However the number of late replicating X chromosomes was significantly lower in cultures grown from fetal tissue when compared with those grown from extra-embryonic tissue. In cultures derived from extra-embryonic tissue there was a significant correlation between the gestational age of the sample and the proportion of late replicating X chromosomes. The older the specimen, the greater the number of late replicating X chromosomes.

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Abnormal X: autosome ratio, but normal X chromosome inactivation in human triploid cultures.

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