Loss of Tmem30a leads to photoreceptor degeneration.

Loss of Tmem30a leads to photoreceptor degeneration.
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Tmem30a 缺失导致光感受器退化

DOI:
10.1038/s41598-017-09506-5
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发表时间:
2017-08-24
期刊:
影响因子:
4.6
通讯作者:
Zhu X
Zhu X
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Zhang L;Yang Y;Li S;Zhang S;Zhu X;Tai Z;Yang M;Liu Y;Guo X;Chen B;Jiang Z;Lu F;Zhu X

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磷脂酰丝氨酸(PS)在真核细胞中不对称地分布于质膜的内外小叶之间。质膜上的PS不对称性取决于P4-ATP酶的活性,PS分布的破坏可导致各种疾病。P4-ATP酶的折叠和转运需要β亚基TMEM 30 A蛋白。然而,Tmem 30 a的体内功能仍然未知。为此,我们产生了视网膜特异性Tmem 30 a敲除小鼠,以首次研究其在体内的作用。我们的数据表明,小鼠视锥细胞中Tmem 30 a的缺失导致视锥视蛋白的错误定位,明视视网膜电图(ERG)反应的丧失和视锥细胞的丧失。从机制上讲,Tmem 30 a突变的小鼠胚胎成纤维细胞(MEFs)表现出PS翻转酶活性降低和PS在细胞表面上的暴露增加。成年小鼠Tmem 30 a的广泛缺失导致暗视光反应降低,ATP 8A 2在内节和细胞体的错误定位,以及视网膜中细胞凋亡的增加。我们的数据证明了Tmem 30 a在视网膜中的新的重要作用。
Phosphatidylserine (PS) is asymmetrically distributed between the outer and inner leaflets of the plasma membrane in eukaryotic cells. PS asymmetry on the plasma membrane depends on the activities of P4-ATPases, and disruption of PS distribution can lead to various disease conditions. Folding and transporting of P4-ATPases to their cellular destination requires the β subunit TMEM30A proteins. However, the in vivo functions of Tmem30a remain unknown. To this end, we generated retinal-specific Tmem30a-knockout mice to investigate its roles in vivo for the first time. Our data demonstrated that loss of Tmem30a in mouse cone cells leads to mislocalization of cone opsin, loss of photopic electroretinogram (ERG) responses and loss of cone cells. Mechanistically, Tmem30a-mutant mouse embryonic fibroblasts (MEFs) exhibited diminished PS flippase activity and increased exposure of PS on the cell surface. The broad loss of Tmem30a in adult mice led to a reduced scotopic photoresponse, mislocalization of ATP8A2 to the inner segment and cell body, and increased apoptosis in the retina. Our data demonstrated novel essential roles of Tmem30a in the retina.
Drs2p的作用,P型ATPase和潜在的氨基磷脂易位酶,在高尔基酵母晚期功能中。
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