Defining early steps in mRNA transport: mutant mRNA in myotonic dystrophy type I is blocked at entry into SC-35 domains.
Defining early steps in mRNA transport: mutant mRNA in myotonic dystrophy type I is blocked at entry into SC-35 domains.
复制标题
DOI:
10.1083/jcb.200706048
复制
发表时间:
2007-09-10
期刊:
影响因子:
--
通讯作者:
Lawrence JB
中科院分区:
文献类型:
--
作者:
Smith KP;Byron M;Johnson C;Xing Y;Lawrence JB
In myotonic dystrophy type 1 (DM1), triplet repeat expansion in the 3′ untranslated region of dystrophia myotonica protein kinase (DMPK) causes the nuclear retention of mutant messenger RNA (mRNA). Although the DMPK gene locus positions precisely at the outer edge of a factor-rich SC-35 domain, the normal mRNA consistently accumulates within the domain, and this RNA is depleted upon transcriptional inhibition. In DM1, mutant transcripts detach from the gene but accumulate in granules that abut but do not enter SC-35 domains, suggesting that RNA entry into the domain is blocked. Despite their exclusion from these compartments, mutant transcripts are spliced. MBNL1 (muscleblind-like protein 1) is an alternative splicing factor that becomes highly concentrated with mutant RNA foci. Small interfering RNA–mediated knockdown of MBNL1 promotes the accumulation or entry of newly synthesized mutant transcripts in the SC-35 domain. Collectively, these data suggest that an initial step in the intranuclear path of some mRNAs is passage from the gene into an SC-35 domain and implicate these structures in postsplicing steps before export.
登录
查看更多内容
影响因子:
56.9
作者:
Cheng, J;Kapranov, P;Gingeras, TR
通讯作者:
Gingeras, TR
影响因子:
7.8
作者:
Carter, K C;Taneja, K L;Lawrence, J B
通讯作者:
Lawrence, J B
DOI:
10.1083/jcb.127.3.593
发表时间:
1994-11
期刊:
The Journal of cell biology
影响因子:
--
作者:
Blencowe BJ;Nickerson JA;Issner R;Penman S;Sharp PA
通讯作者:
Sharp PA
影响因子:
3.5
作者:
Hall, LL;Clemson, CM;Lawrence, JB
通讯作者:
Lawrence, JB
影响因子:
10.5
作者:
Blencowe, BJ;Issner, R;Sharp, PA
通讯作者:
Sharp, PA