alexa Genes that escape from X inactivation.
Immunology

Immunology

Rheumatology: Current Research

Author(s): Berletch JB, Yang F, Xu J, Carrel L, Disteche CM

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Abstract To achieve a balanced gene expression dosage between males (XY) and females (XX), mammals have evolved a compensatory mechanism to randomly inactivate one of the female X chromosomes. Despite this chromosome-wide silencing, a number of genes escape X inactivation: in women about 15\% of X-linked genes are bi-allelically expressed and in mice, about 3\%. Expression from the inactive X allele varies from a few percent of that from the active allele to near equal expression. While most genes have a stable inactivation pattern, a subset of genes exhibit tissue-specific differences in escape from X inactivation. Escape genes appear to be protected from the repressive chromatin modifications associated with X inactivation. Differences in the identity and distribution of escape genes between species and tissues suggest a role for these genes in the evolution of sex differences in specific phenotypes. The higher expression of escape genes in females than in males implies that they may have female-specific roles and may be responsible for some of the phenotypes observed in X aneuploidy.
This article was published in Hum Genet and referenced in Rheumatology: Current Research

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