A mouse model for osseous heteroplasia.

A mouse model for osseous heteroplasia.
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DOI:
10.1371/journal.pone.0051835
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Peters J
Peters J
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Cheeseman MT;Vowell K;Hough TA;Jones L;Pathak P;Tyrer HE;Kelly M;Cox R;Warren MV;Peters J

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GNAS/Gnas编码的Gsα主要是双等位基因表达,但在某些组织中显示印迹表达。在Albright遗传性骨营养不良(AHO)中,GNAS的杂合性功能丧失突变可导致异位骨化,其往往是浅表的,可归因于双等位基因表达的Gsα的单倍不足。Oed-Sml是一个位于小鼠基因座Gnas第6外显子的点错义突变。我们在此报告Oed-Sml的迟发性骨化和良性皮肤纤维上皮息肉的发生。这些表型在突变等位基因的母系和父系遗传中都可以观察到,因此是由于对双等位基因表达的Gsα的影响。骨化仅限于皮下组织,因此与AHO观察到的骨化相似。我们的小鼠模型是第一个既有皮下骨化又有与Gsα缺乏相关的纤维上皮息肉的模型。这也是第一个描述了与Gsα点突变相关的临床相关表型的小鼠模型,可能有助于异位骨形成机制的研究。结合早期的结果,我们的研究结果表明Gsα信号通路在抑制异位骨形成中起着至关重要的作用。
GNAS/Gnas encodes Gsα that is mainly biallelically expressed but shows imprinted expression in some tissues. In Albright Hereditary Osteodystrophy (AHO) heterozygous loss of function mutations of GNAS can result in ectopic ossification that tends to be superficial and attributable to haploinsufficiency of biallelically expressed Gsα. Oed-Sml is a point missense mutation in exon 6 of the orthologous mouse locus Gnas. We report here both the late onset ossification and occurrence of benign cutaneous fibroepithelial polyps in Oed-Sml. These phenotypes are seen on both maternal and paternal inheritance of the mutant allele and are therefore due to an effect on biallelically expressed Gsα. The ossification is confined to subcutaneous tissues and so resembles the ossification observed with AHO. Our mouse model is the first with both subcutaneous ossification and fibroepithelial polyps related to Gsα deficiency. It is also the first mouse model described with a clinically relevant phenotype associated with a point mutation in Gsα and may be useful in investigations of the mechanisms of heterotopic bone formation. Together with earlier results, our findings indicate that Gsα signalling pathways play a vital role in repressing ectopic bone formation.
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