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Insights into X chromosome inactivation from studies of species variation, DNA methylation and replication, and vice versa

Published online by Cambridge University Press:  14 April 2009

Barbara R. Migeon
Barbara R. Migeon
Affiliation:
Department of Pediatrics and The Center for Medical Genetics, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21210, USA
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I am indebted to Mary Lyon as her X-inactivation hypothesis stimulated my mentor, Barton Childs, and in turn, myself, to think about the consequences of X-inactivation in heterozygous females. I often reread her original papers setting forth the single active X hypothesis, and still marvel at the concise and compelling exposition of the hypothesis and the logical predictions which seemed prophetic at my first reading, and have survived the test of time.

My contribution to this Festschrift reviews evidence derived from studies of DNA methylation, species variation and DNA replication that reveals an important role for methylated CpG islands and suggests a role for late DNA replication in propagating X inactivation from one cell to its progeny. These studies also show that X inactivation is a powerful research tool for identifying the factors which program and maintain developmental processes.

Information

Type
Research Article
Information
Genetics Research , Volume 56 , Issue 2-3 , October 1990 , pp. 91 - 98
Copyright
Copyright © Cambridge University Press 1990

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