Two missense mutations in KCNQ1 cause pituitary hormone deficiency and maternally inherited gingival fibromatosis.

Two missense mutations in KCNQ1 cause pituitary hormone deficiency and maternally inherited gingival fibromatosis.
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DOI:
10.1038/s41467-017-01429-z
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发表时间:
2017-11-03
影响因子:
16.6
通讯作者:
Raivio T
Raivio T
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Tommiska J;Känsäkoski J;Skibsbye L;Vaaralahti K;Liu X;Lodge EJ;Tang C;Yuan L;Fagerholm R;Kanters JK;Lahermo P;Kaunisto M;Keski-Filppula R;Vuoristo S;Pulli K;Ebeling T;Valanne L;Sankila EM;Kivirikko S;Lääperi M;Casoni F;Giacobini P;Phan-Hug F;Buki T;Tena-Sempere M;Pitteloud N;Veijola R;Lipsanen-Nyman M;Kaunisto K;Mollard P;Andoniadou CL;Hirsch JA;Varjosalo M;Jespersen T;Raivio T

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家族性生长激素缺乏症为识别身材矮小的新遗传原因提供了机会。在这里,我们将连锁分析与全基因组重测序结合起来,研究生长激素缺乏症和母系遗传性牙龈纤维瘤病患者。我们报告来自三个不相关家庭的患者在 KCNQ1 中携带两种错义突变,即 c.347G>T p.(Arg116Leu) 或 c.1106C>T p.(Pro369Leu),KCNQ1 是一种先前与长 QT 间期综合征有关的基因。 Kcnq1 在下丘脑 GHRH 神经元和垂体生长激素中表达。 KCNQ1 与 KCNE2 β 亚基的共表达表明,两种 KCNQ1 突变体都会增加膜片钳分析中的电流水平,并与 AtT-20 细胞垂体激素分泌减少相关。总之,我们的结果揭示了 KCNQ1 钾通道在人类生长调节中的作用,并表明与母体遗传性牙龈纤维瘤病相关的生长激素缺乏是一种由 KCNQ1 突变引起的心律失常综合征的等位基因疾病。生长迟缓最常见是由生长激素途径的遗传缺陷引起的。在这里,在患有生长迟缓和牙龈纤维瘤病的家庭中,作者发现了钾通道基因 KCNQ1 的突变,这些突变会导致电生理畸变和体外 ACTH 分泌改变。
Familial growth hormone deficiency provides an opportunity to identify new genetic causes of short stature. Here we combine linkage analysis with whole-genome resequencing in patients with growth hormone deficiency and maternally inherited gingival fibromatosis. We report that patients from three unrelated families harbor either of two missense mutations, c.347G>T p.(Arg116Leu) or c.1106C>T p.(Pro369Leu), in KCNQ1, a gene previously implicated in the long QT interval syndrome. Kcnq1 is expressed in hypothalamic GHRH neurons and pituitary somatotropes. Co-expressing KCNQ1 with the KCNE2 β-subunit shows that both KCNQ1 mutants increase current levels in patch clamp analyses and are associated with reduced pituitary hormone secretion from AtT-20 cells. In conclusion, our results reveal a role for the KCNQ1 potassium channel in the regulation of human growth, and show that growth hormone deficiency associated with maternally inherited gingival fibromatosis is an allelic disorder with cardiac arrhythmia syndromes caused by KCNQ1 mutations. Growth retardation is most commonly caused by genetic defects in the growth hormone pathway. Here, in families with growth retardation and gingival fibromatosis, the authors identify mutations in the potassium channel gene KCNQ1 that cause electrophysiological aberrations and altered ACTH secretion in vitro.
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