A novel X gene with a widely transcribed Y-linked homologue escapes X-inactivation in mouse and human.

Abstract:

:A new gene, designated Smcx, was cloned from the mouse X chromosome by its homology to the Y located gene Smcy. Using direct in situ hybridisation Smcx was mapped to the distal end of the mouse X chromosome (XF2-XF4) and its human homologue, SMCX, was mapped to proximal Xp (Xp11.1-Xp11.2). Further meiotic mapping in the mouse placed Smcx in the Plp-Pdha1 interval. As Smcx/SMCX have widely expressed homologues on the Y chromosome, they appeared good candidates for genes that escape X-inactivation. In the human we show this to be the case as SMCX is expressed in hamster-human hybrids containing either an active or inactive human X chromosome. Two alleles of Smcx were found to be expressed in T(16;X)16H female mice despite the intact X chromosome being inactive in all cells. This indicates that Smcx is also not subject to X-inactivation and provides the first example of a gene that is expressed from inactive and active X chromosomes in the mouse.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Agulnik AI,Mitchell MJ,Mattei MG,Borsani G,Avner PA,Lerner JL,Bishop CE

doi

10.1093/hmg/3.6.879

subject

Has Abstract

pub_date

1994-06-01 00:00:00

pages

879-84

issue

6

eissn

0964-6906

issn

1460-2083

journal_volume

3

pub_type

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