The ubiquitin-conjugating enzyme HR6B is required for maintenance of X chromosome silencing in mouse spermatocytes and spermatids.
The ubiquitin-conjugating enzyme HR6B is required for maintenance of X chromosome silencing in mouse spermatocytes and spermatids.
复制标题
DOI：
10.1186/1471-2164-11-367
复制
发表时间：
2010-06-10
期刊：
影响因子：
4.4
通讯作者：
Baarends WM
中科院分区：
文献类型：
--
作者：
Mulugeta Achame E;Wassenaar E;Hoogerbrugge JW;Sleddens-Linkels E;Ooms M;Sun ZW;van IJcken WF;Grootegoed JA;Baarends WM
The ubiquitin-conjugating enzyme HR6B is required for spermatogenesis in mouse. Loss of HR6B results in aberrant histone modification patterns on the trancriptionally silenced X and Y chromosomes (XY body) and on centromeric chromatin in meiotic prophase. We studied the relationship between these chromatin modifications and their effects on global gene expression patterns, in spermatocytes and spermatids. HR6B is enriched on the XY body and on centromeric regions in pachytene spermatocytes. Global gene expression analyses revealed that spermatid-specific single- and multicopy X-linked genes are prematurely expressed in Hr6b knockout spermatocytes. Very few other differences in gene expression were observed in these cells, except for upregulation of major satellite repeat transcription. In contrast, in Hr6b knockout spermatids, 7298 genes were differentially expressed; 65% of these genes was downregulated, but we observed a global upregulation of gene transcription from the X chromosome. In wild type spermatids, approximately 20% of the single-copy X-linked genes reach an average expression level that is similar to the average expression from autosomes. Spermatids maintain an enrichment of repressive chromatin marks on the X chromosome, originating from meiotic prophase, but this does not interfere with transcription of the single-copy X-linked genes that are reactivated or specifically activated in spermatids. HR6B represses major satellite repeat transcription in spermatocytes, and functions in the maintenance of X chromosome silencing in spermatocytes and spermatids. It is discussed that these functions involve modification of chromatin structure, possibly including H2B ubiquitylation.
登录
查看更多内容
影响因子：
11.8
作者：
Lu, Lin-Yu;Wu, Jiaxue;Ye, Lin;Gavrilina, Galina B.;Saunders, Thomas L.;Yu, Xiaochun
通讯作者：
Yu, Xiaochun
影响因子：
6.6
作者：
Hazzouri, M;Pivot-Pajot, C;Rousseaux, S
通讯作者：
Rousseaux, S
DOI：
10.1073/pnas.0910267107
发表时间：
2010-02-02
影响因子：
11.1
作者：
An, Jee Young;Kim, Eun-A.;Kwon, Yong Tae
通讯作者：
Kwon, Yong Tae
影响因子：
4.8
作者：
Daniel, JA;Torok, MS;Grant, PA
通讯作者：
Grant, PA
影响因子：
11.4
作者：
Martens, JHA;O'Sullivan, RJ;Jenuwein, T
通讯作者：
Jenuwein, T