Loss of muscleblind-like 1 results in cardiac pathology and persistence of embryonic splice isoforms.

Loss of muscleblind-like 1 results in cardiac pathology and persistence of embryonic splice isoforms.
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肌肉闪烁的丧失1导致心脏病理和胚胎剪接同工型的持久性。

DOI:
10.1038/srep09042
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发表时间:
2015-03-12
期刊:
影响因子:
4.6
通讯作者:
Reddy S
Reddy S
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Dixon DM;Choi J;El-Ghazali A;Park SY;Roos KP;Jordan MC;Fishbein MC;Comai L;Reddy S

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心功能障碍是肌强直性营养不良I (DM1)患者死亡的一个重要原因,DM1是一种扩大的CUG重复序列结合并使剪接调节因子家族失效的疾病。129只sv小鼠中肌盲样1 (Mbnl1ΔE2/ΔE2)的缺失导致2-4月龄时QRS、QTc增宽、束阻滞和STc变窄。随着时间的推移,心功能进一步恶化,6个月时出现R波振幅下降、窦房结功能障碍、心肌肥厚、间质纤维化、心肌纤维多灶性死亡和钙化。在雄性和雌性Mbnl1ΔE2/ΔE2小鼠中,分别有67%和86%的小鼠在中位年龄为6.5和4.8个月时突然死亡,没有明显的终点疾病。Mbnl1的缺失导致心脏rna网络中胚胎剪接异构体的持续存在,其中一些先前与DM1有关,调节钠和钙电流,Scn5a, Junctin, Junctate, Atp2a1, Atp11a, Cacna1s, Ryr2,细胞内和细胞间运输,Clta, Stx2, Tjp1,细胞存活,Capn3, Sirt2, Csda,肌节和细胞骨架组织和功能,Trim55, Mapt, Pdlim3, Pdlim5, Sorbs1, Sorbs2, Fhod1, Spag9和肌节的结构成分。Myom1, Tnnt2, Zasp。因此,本研究支持Mbnl1缺失在DM1心脏病发病中的关键作用。
Cardiac dysfunction is a prominent cause of mortality in myotonic dystrophy I (DM1), a disease where expanded CUG repeats bind and disable the muscleblind-like family of splice regulators. Deletion of muscleblind-like 1 (Mbnl1ΔE2/ΔE2) in 129 sv mice results in QRS, QTc widening, bundle block and STc narrowing at 2–4 months of age. With time, cardiac function deteriorates further and at 6 months, decreased R wave amplitudes, sinus node dysfunction, cardiac hypertrophy, interstitial fibrosis, multi-focal myocardial fiber death and calcification manifest. Sudden death, where no end point illness is overt, is observed at a median age of 6.5 and 4.8 months in ~67% and ~86% of male and female Mbnl1ΔE2/ΔE2 mice, respectively. Mbnl1 depletion results in the persistence of embryonic splice isoforms in a network of cardiac RNAs, some of which have been previously implicated in DM1, regulating sodium and calcium currents, Scn5a, Junctin, Junctate, Atp2a1, Atp11a, Cacna1s, Ryr2, intra and inter cellular transport, Clta, Stx2, Tjp1, cell survival, Capn3, Sirt2, Csda, sarcomere and cytoskeleton organization and function, Trim55, Mapt, Pdlim3, Pdlim5, Sorbs1, Sorbs2, Fhod1, Spag9 and structural components of the sarcomere, Myom1, Tnnt2, Zasp. Thus this study supports a key role for Mbnl1 loss in the initiation of DM1 cardiac disease.
DOI: 10.1056/nejmoa062800
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影响因子: 158.5
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