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Science 16 November 2007:
Vol. 318. no. 5853, pp. 1136 - 1140
DOI: 10.1126/science.1148910
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Reports

Widespread Monoallelic Expression on Human Autosomes

Alexander Gimelbrant, John N. Hutchinson, Benjamin R. Thompson, Andrew Chess*

Monoallelic expression with random choice between the maternal and paternal alleles defines an unusual class of genes comprising X-inactivated genes and a few autosomal gene families. Using a genome-wide approach, we assessed allele-specific transcription of about 4000 human genes in clonal cell lines and found that more than 300 were subject to random monoallelic expression. For a majority of monoallelic genes, we also observed some clonal lines displaying biallelic expression. Clonal cell lines reflect an independent choice to express the maternal, the paternal, or both alleles for each of these genes. This can lead to differences in expressed protein sequence and to differences in levels of gene expression. Unexpectedly widespread monoallelic expression suggests a mechanism that generates diversity in individual cells and their clonal descendants.

Center for Human Genetic Research and Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Simches Research Building, 185 Cambridge Street, Boston, MA 02114, USA.

* To whom correspondence should be addressed. E-mail: chess{at}chgr.mgh.harvard.edu

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