SnoRNA Snord116 (Pwcr1/MBII-85) deletion causes growth deficiency and hyperphagia in mice.

SnoRNA Snord116 (Pwcr1/MBII-85) deletion causes growth deficiency and hyperphagia in mice.
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DOI:
10.1371/journal.pone.0001709
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发表时间:
2008-03-05
期刊:
影响因子:
3.7
通讯作者:
Francke, Uta
Francke, Uta
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Ding, Feng;Li, Hong Hua;Zhang, Shengwen;Solomon, Nicola M.;Camper, Sally A.;Cohen, Pinchas;Francke, Uta

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普瑞德威利综合征 (PWS) 是导致肥胖的主要原因。在最初的严重肌张力减退后,如果不限制摄入量,PWS 儿童会变得贪食和病态肥胖。其他特征包括身材矮小、生长激素分泌异常、性腺功能减退、认知障碍、焦虑和行为问题。 PWS 是由于染色体带 15q11.2 约 4 mb 区域中印记基因表达缺失引起的。我们之前的易位研究预测了 C/D 盒小核仁 RNA 簇 SNORD116 (PWCR1/HBII-85) 在 PWS 中的主要作用。为了验证这一假设,我们在 C57BL/6 小鼠中对超过 40 个 Snord116 (Pwcr1/MBII-85) 拷贝进行了约 150 kb 的删除。具有父源性缺失的 Snord116del 小鼠缺乏这种 snoRNA 的表达。他们患有早发性产后生长缺陷,但生育能力和寿命正常。虽然垂体结构和生长激素正常,但肝脏 Igf1 mRNA 减少。在认知和行为测试中,Snord116del 小鼠的运动学习能力不足,并且焦虑感增加。大约三个月大时,它们会出现食欲亢进,但通过常规高脂肪饮食保持苗条。在热量摄入减少的情况下,Snord116del 小鼠比野生型同窝小鼠更好地保持体重,排除了导致食欲过多的能量需求增加的情况。禁食后正常的补充喂养以及在寒冷中维持体温的能力表明正常的能量稳态调节。代谢室研究表明,Snord116del 小鼠通过改变燃料使用来维持能量稳态。进餐时间延长和循环胃饥饿素增加表明进餐终止机制存在缺陷。 Snord116del 小鼠是第一个 snoRNA 缺失动物模型,揭示了非编码 RNA 在生长和摄食调节中的新作用。
Prader-Willi syndrome (PWS) is the leading genetic cause of obesity. After initial severe hypotonia, PWS children become hyperphagic and morbidly obese, if intake is not restricted. Short stature with abnormal growth hormone secretion, hypogonadism, cognitive impairment, anxiety and behavior problems are other features. PWS is caused by lack of expression of imprinted genes in a ∼4 mb region of chromosome band 15q11.2. Our previous translocation studies predicted a major role for the C/D box small nucleolar RNA cluster SNORD116 (PWCR1/HBII-85) in PWS. To test this hypothesis, we created a ∼150 kb deletion of the >40 copies of Snord116 (Pwcr1/MBII-85) in C57BL/6 mice. Snord116del mice with paternally derived deletion lack expression of this snoRNA. They have early-onset postnatal growth deficiency, but normal fertility and lifespan. While pituitary structure and somatotrophs are normal, liver Igf1 mRNA is decreased. In cognitive and behavior tests, Snord116del mice are deficient in motor learning and have increased anxiety. Around three months of age, they develop hyperphagia, but stay lean on regular and high-fat diet. On reduced caloric intake, Snord116del mice maintain their weight better than wild-type littermates, excluding increased energy requirement as a cause of hyperphagia. Normal compensatory feeding after fasting, and ability to maintain body temperature in the cold indicate normal energy homeostasis regulation. Metabolic chamber studies reveal that Snord116del mice maintain energy homeostasis by altered fuel usage. Prolonged mealtime and increased circulating ghrelin indicate a defect in meal termination mechanism. Snord116del mice, the first snoRNA deletion animal model, reveal a novel role for a non-coding RNA in growth and feeding regulation.
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