TIA1 is a gender-specific disease modifier of a mild mouse model of spinal muscular atrophy.

TIA1 is a gender-specific disease modifier of a mild mouse model of spinal muscular atrophy.
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DOI:
10.1038/s41598-017-07468-2
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发表时间:
2017-08-03
期刊:
影响因子:
4.6
通讯作者:
Singh RN
Singh RN
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Howell MD;Ottesen EW;Singh NN;Anderson RL;Seo J;Sivanesan S;Whitley EM;Singh RN

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脊髓性肌萎缩症 (SMA) 是由运动神经元存活 1 (SMN1) 基因缺失或突变引起的。几乎相同的 SMN2 无法补偿 SMN1 由于外显子 7 跳跃而造成的损失。等位基因 C (C +/+) 小鼠重现了轻度 SMA 样表型,并提供了一个理想的系统来长期监测疾病调节因素的作用。 T 细胞限制性胞内抗原 1 (TIA1) 调节 SMN 外显子 7 剪接。据报道,TIA1 在肥胖患者中表达下调,但尚不清楚这种影响是否具有性别特异性。我们发现雌性 Tia1 敲除 (Tia1 −/−) 小鼠在产后早期发育过程中体重 (BW) 显着增加。接下来我们检查了 Tia1 缺失对新型 C +/+/Tia1 −/− 小鼠的影响。强调 Tia1 缺失和低 SMN 水平对体重增加的相反影响,C +/+ 和 C +/+/Tia1 −/− 雌性在我们研究期间的所有时间点都表现出相似的体重增加轨迹。我们在 C +/+/Tia1 −/− 雌性中观察到早期尾部坏死,但在雄性中没有观察到。我们发现男性生殖器官发育受损加剧,C +/+/Tia1 −/− 睾丸转录组恶化。我们的研究结果表明,蛋白质因子可以作为轻度 SMA 小鼠模型的性别特异性调节剂。
Spinal muscular atrophy (SMA) is caused by deletions or mutations of Survival Motor Neuron 1 (SMN1) gene. The nearly identical SMN2 cannot compensate for SMN1 loss due to exon 7 skipping. The allele C (C +/+) mouse recapitulates a mild SMA-like phenotype and offers an ideal system to monitor the role of disease-modifying factors over a long time. T-cell-restricted intracellular antigen 1 (TIA1) regulates SMN exon 7 splicing. TIA1 is reported to be downregulated in obese patients, although it is not known if the effect is gender-specific. We show that female Tia1-knockout (Tia1 −/−) mice gain significant body weight (BW) during early postnatal development. We next examined the effect of Tia1 deletion in novel C +/+/Tia1 −/− mice. Underscoring the opposing effects of Tia1 deletion and low SMN level on BW gain, both C +/+ and C +/+/Tia1 −/− females showed similar BW gain trajectory at all time points during our study. We observed early tail necrosis in C +/+/Tia1 −/− females but not in males. We show enhanced impairment of male reproductive organ development and exacerbation of the C +/+/Tia1 −/− testis transcriptome. Our findings implicate a protein factor as a gender-specific modifier of a mild mouse model of SMA.
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