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首页> 外文期刊>Genomics >Mus musculus and Mus spretus homologues of the human telomere-associated protein TIN2.
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Mus musculus and Mus spretus homologues of the human telomere-associated protein TIN2.

机译:小家鼠小鼠拒绝了人类端粒相关蛋白TIN2的同源物。

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摘要

Telomere length is regulated by TRF1, which binds telomeric DNA, and TIN2, which binds TRF1. Laboratory mice (Mus musculus) have long telomeres, although a related mouse species, Mus spretus, has human-sized telomeres. Because differences in TIN2 might explain these differences in telomere length, we cloned cDNAs encoding murine TIN2s and compared their sequence to that of human TIN2. M. musculus (Mm) and M. spretus TIN2s were >95% identical, but shared only 67% identity with human TIN2. An N-terminal truncation, or N-terminal fragment, of MmTIN2 elongated M. spretus telomeres. These findings suggest that mouse TIN2, like human TIN2, negatively regulates telomere length, and that N-terminal perturbations have dominant-negative effects. Our findings suggest that differences in TIN2 cannot explain the telomere length differences among Homo sapiens, M. musculus, and M. spretus. Nonetheless, M. spretus cells appear be a good system for studying the function of mouse telomere-associated proteins.
机译:端粒的长度受与端粒DNA结合的TRF1和与TRF1结合的TIN2的调控。实验室小鼠(小家鼠)的端粒很长,尽管相关的小鼠物种spretus具有人类大小的端粒。因为TIN2的差异可能解释了端粒长度的这些差异,所以我们克隆了编码鼠TIN2的cDNA,并将其序列与人TIN2的序列进行了比较。小家鼠(M. musculus)和斯普雷特氏菌(M. spretus)的TIN2同源性> 95%,但与人类TIN2的同源性仅为67%。 MmTIN2拉长的斯氏支原体端粒的N端截短或N端片段。这些发现表明,小鼠TIN2像人TIN2一样,负调控端粒的长度,并且N端扰动具有显性负作用。我们的研究结果表明,TIN2的差异不能解释智人,小家鼠和s。spretus之间的端粒长度差异。但是,支原体支原体细胞似乎是研究小鼠端粒相关蛋白功能的良好系统。

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