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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Frequency of reactivation and variability in expression of X-linked enzyme loci.

A mouse-human cell hybrid clone retaining an inactive human X chromosome was treated with 5-azacytidine. Following treatment, expression of the X-linked enzyme markers, hypoxanthine-guanine phosphoribosyltransferase (HPRT), glucose-6-phosphate dehydrogenase ( G6PD), phosphoglycerate kinase ( PGK), and alpha-galactosidase A ( GLA) was examined. Results presented here show that 45 of the 62 clones positive for human HPRT expressed human GLA, while only four of 68 clones negative for human HPRT expressed human GLA. These results strongly suggest that there is coordinate reactivation of GLA and HPRT. Reactivated expression of G6PD was studied in detail. The studies show that 5-azacytidine can induce heritable changes in the inactive human X chromosome resulting in the expression of G6PD activity at a level lower than that from an active human X chromosome.[1]

References

  1. Frequency of reactivation and variability in expression of X-linked enzyme loci. Mohandas, T., Sparkes, R.S., Bishop, D.F., Desnick, R.J., Shapiro, L.J. Am. J. Hum. Genet. (1984) [Pubmed]
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