Genomic loci mispositioning in Tmem120a knockout mice yields latent lipodystrophy.

Genomic loci mispositioning in Tmem120a knockout mice yields latent lipodystrophy.
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DOI:
10.1038/s41467-021-27869-2
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发表时间:
2022-01-13
影响因子:
16.6
通讯作者:
Schirmer EC
Schirmer EC
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Czapiewski R;Batrakou DG;de Las Heras JI;Carter RN;Sivakumar A;Sliwinska M;Dixon CR;Webb S;Lattanzi G;Morton NM;Schirmer EC

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关于观察到的脂肪特异性3D空间基因组组织模式是如何建立的,人们知之甚少。在这里,我们报告,脂肪细胞特异性敲除编码核膜跨膜蛋白Tmem 120 a的基因破坏脂肪基因组组织,从而导致脂肪代谢障碍综合征。Tmem 120 a缺陷广泛抑制脂质代谢途径基因表达,并通过在核周边和内部之间重新定位基因、增强子和miRNA编码位点来诱导肌源性基因表达。Tmem 120 a −/−小鼠,特别是雌性小鼠,表现出与人类家族性部分脂肪代谢障碍FPLD 2相似的脂肪代谢障碍综合征,具有严重的胰岛素抵抗和代谢缺陷,在暴露于致肥胖饮食时表现出来。有趣的是,类似的基因组组织缺陷发生在来自携带编码LMNA突变的核膜蛋白的FPLD 2患者的细胞中。我们的数据表明,TMEM 120 A基因组组织功能影响许多脂肪功能,其丧失可能导致肥胖谱疾病,包括基于miRNA的机制,可以解释人类脂肪代谢障碍中的肌肉肥大。很少有人知道空间基因组组织是如何在脂肪中定向的;然而,在脂肪形成过程中,关键的前脂肪形成基因从核膜(NE)重新定位到内部。在这里,作者表明,脂肪细胞中NE蛋白Tmem 120 a的缺失破坏了脂肪基因组的组织,这导致脂质代谢途径的抑制并诱导生肌基因的表达。
Little is known about how the observed fat-specific pattern of 3D-spatial genome organisation is established. Here we report that adipocyte-specific knockout of the gene encoding nuclear envelope transmembrane protein Tmem120a disrupts fat genome organisation, thus causing a lipodystrophy syndrome. Tmem120a deficiency broadly suppresses lipid metabolism pathway gene expression and induces myogenic gene expression by repositioning genes, enhancers and miRNA-encoding loci between the nuclear periphery and interior. Tmem120a−/− mice, particularly females, exhibit a lipodystrophy syndrome similar to human familial partial lipodystrophy FPLD2, with profound insulin resistance and metabolic defects that manifest upon exposure to an obesogenic diet. Interestingly, similar genome organisation defects occurred in cells from FPLD2 patients that harbour nuclear envelope protein encoding LMNA mutations. Our data indicate TMEM120A genome organisation functions affect many adipose functions and its loss may yield adiposity spectrum disorders, including a miRNA-based mechanism that could explain muscle hypertrophy in human lipodystrophy. Little is known how spatial genome organization is directed in fat; however, key proadipogenic genes reposition from the nuclear envelope (NE) to the interior during adipogenesis. Here the authors show that deletion of NE protein Tmem120a in adipocytes disrupts fat genome organization, which results in suppression of lipid metabolism pathways and induces myogenic gene expression.
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