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Molecular evolution of the HBII-52 snoRNA cluster.

机译:HBII-52 snoRNA簇的分子进化。

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HBII-52 is a human brain-specific C/D box snoRNA that potentially regulates the editing and/or alternative splicing of the serotonin receptor. Forty-two nearly identical copies of the HBII-52 gene are located immediately downstream of the SNRPN protein-coding gene in an imprinted locus associated with Prader-Willi syndrome. Other eutherian mammals, with genomic assemblies covering the corresponding locus, also have multiple orthologous copies of HBII-52. The SNRPB gene, which is known to have given rise to SNRPN through gene duplication, expresses a C/D box snoRNA, SNORD119, from its fifth intron. Here we show that, despite the fact that they lie in different positions relative to the orthologous SNRPB/SNRPN coding sequences, there are significant sequence similarities between SNORD119 and HBII-52, including the antisense element and the stem-forming regions. By analysing these snoRNAs in marsupial and eutherian mammal genomes, we reconstruct the likely evolutionary history of the HBII-52 cluster and SNORD119 and suggest that they have evolved from a common ancestor.
机译:HBII-52是人脑特异性C / D盒snoRNA,可潜在地调节5-羟色胺受体的编辑和/或替代剪接。 HBII-52基因的四十二个几乎相同的副本位于与Prader-Willi综合征相关的印迹部位中SNRPN蛋白编码基因的紧下游。其他具有覆盖相应基因座的基因组装配的真人哺乳动物也具有HBII-52的多个直系同源拷贝。已知通过基因复制产生SNRPN的SNRPB基因从其第五个内含子表达一个C / D盒snoRNA SNORD119。在这里,我们显示,尽管它们相对于直系同源SNRPB / SNRPN编码序列位于不同的位置,但SNORD119与HBII-52之间存在明显的序列相似性,包括反义元件和茎形成区域。通过分析有袋和以太哺乳动物哺乳动物基因组中的这些snoRNA,我们重建了HBII-52簇和SNORD119的可能进化史,并暗示它们是从共同祖先进化而来的。

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