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PLoS Genet. 2008 Jan;4(1):e9. doi: 10.1371/journal.pgen.0040009. Epub 2007 Dec 13.

Large-scale population study of human cell lines indicates that dosage compensation is virtually complete.

Author information

  • 1X Chromosome Group, Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton, Cambridge, United Kingdom.

Abstract

X chromosome inactivation in female mammals results in dosage compensation of X-linked gene products between the sexes. In humans there is evidence that a substantial proportion of genes escape from silencing. We have carried out a large-scale analysis of gene expression in lymphoblastoid cell lines from four human populations to determine the extent to which escape from X chromosome inactivation disrupts dosage compensation. We conclude that dosage compensation is virtually complete. Overall expression from the X chromosome is only slightly higher in females and can largely be accounted for by elevated female expression of approximately 5% of X-linked genes. We suggest that the potential contribution of escape from X chromosome inactivation to phenotypic differences between the sexes is more limited than previously believed.

PMID:
18208332
[PubMed - indexed for MEDLINE]
PMCID:
PMC2213701
Free PMC Article

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