...
首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >An imprinted, mammalian bicistronic transcript encodes two independent proteins
【24h】

An imprinted, mammalian bicistronic transcript encodes two independent proteins

机译:印迹的哺乳动物双顺反子转录物编码两个独立的蛋白质

获取原文
获取原文并翻译 | 示例
           

摘要

Polycistronic transcripts are common in prokaryotes but rare in eukaryotes. Phylogenetic analysis of the SNRPN (SmN) mRNA in five eutherian mammals reveals a second highly conserved coding sequence, termed SNURF (SNMN upstream reading frame). The vast majority of nucleotide substitutions in SNURF occur in the wobble codon position, providing strong evolutionary evidence for selection for protein-coding function. Because SNURF-SNRPN maps to human chromosome 15qll-q13 and is paternally expressed, each cistron is a candidate for a role in the imprinted Prader-Willi syndrome (PWS) and PWS mouse models. SNURF encodes a highly basic 71-aa protein that is nuclear- localized (as is SmN). Because SNURF is the only protein-coding sequence within the imprinting regulatory region in I5qll-q13, it may have Provided the original selection for imprinting in this domain. Whereas some human tissues express a minor SNUM-only transcript, mouse tissues express only the bicistronic Snurf-Snrpn transcript. We show that both SNUM and SNRPN are translated in normal, but not PWS, human, and mouse tissues and cell lines. These findings identify SNURF as a protein that is produced along with SmN from a bicistronic transcript, polycistronic mRNAs therefore are encoded in mammalian genomes where they may form functional operons.
机译:多顺反子转录本在原核生物中很常见,而在真核生物中则很少。系统进化分析的五个eutherian哺乳动物中的SNRPN(SmN)mRNA显示了第二个高度保守的编码序列,称为SNURF(SNMN上游阅读框)。 SNURF中的绝大多数核苷酸取代发生在摆动密码子位置,为选择蛋白质编码功能提供了有力的进化证据。因为SNURF-SNRPN映射到人类染色体15q11-q13并在父系中表达,所以每个顺反子都是在印迹的Prader-Willi综合征(PWS)和PWS小鼠模型中起作用的候选者。 SNURF编码一种高度碱性的71-aa蛋白,该蛋白在核内定位(SmN也是)。由于SNURF是I5qll-q13印迹调控区域内唯一的蛋白质编码序列,因此它可能为该域的印迹提供了原始选择。某些人体组织仅表达次要的SNUM转录本,而小鼠组织仅表达双顺反子Snurf-Snrpn转录本。我们显示SNUM和SNRPN都在正常翻译,但在PWS,人和小鼠组织和细胞系中未翻译。这些发现将SNURF鉴定为与双顺反子转录物与SmN一起产生的蛋白质,因此多顺反子mRNA在哺乳动物基因组中编码,它们可能形成功能操纵子。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号