ZAC, LIT1 (KCNQ1OT1) and p57KIP2 (CDKN1C) are in an imprinted gene network that may play a role in Beckwith-Wiedemann syndrome.

ZAC, LIT1 (KCNQ1OT1) and p57KIP2 (CDKN1C) are in an imprinted gene network that may play a role in Beckwith-Wiedemann syndrome.
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ZAC,LIT1(KCNQ1OT1)和P57KIP2(CDKN1C)处于一个烙印基因网络中,可能在Beckwith-Wiedemann综合征中发挥作用。

DOI:
10.1093/nar/gki555
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发表时间:
2005
影响因子:
14.9
通讯作者:
Wake, N
Wake, N
中科院分区:
生物学2区
文献类型:
--
作者:
Arima, T;Kamikihara, T;Hayashida, T;Kato, K;Inoue, T;Shirayoshi, Y;Oshimura, M;Soejima, H;Mukai, T;Wake, N

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基因组印记的缺失与许多发育异常和癌症有关。ZAC是一种印迹基因,由染色体6q24的父本等位基因表达,该区域已知含有几种类型肿瘤的肿瘤抑制基因。p57KIP2 (CDKN1C)是位于染色体11p15.5上的母系表达基因,其编码周期蛋白依赖性激酶抑制剂,也可能作为肿瘤抑制基因。ZAC和p57KIP2突变分别与短暂性新生儿糖尿病(TNDB)和Beckwith-Wiedemann综合征有关。患有这些疾病的患者有许多共同特征。在这里,我们发现小鼠Zac1和p57Kip2具有惊人相似的表达模式。ZAC是一种序列特异性的dna结合蛋白,结合在LIT1 (kcnq10t1)的CpG岛内,LIT1是一种父系表达的反义RNA,被认为以顺式方式负调控p57KIP2。ZAC以甲基化依赖的方式诱导LIT1转录。我们的数据表明,ZAC可能通过LIT1调控p57KIP2,形成了调节细胞生长的新信号通路的一部分。因此,ZAC的突变可能会导致Beckwith-Wiedemann综合征。此外,我们发现两名TNDB患者在LIT1假定的印迹控制区的DNA甲基化发生了变化。
Loss of genomic imprinting is involved in a number of developmental abnormalities and cancers. ZAC is an imprinted gene expressed from the paternal allele of chromosome 6q24 within a region known to harbor a tumor suppressor gene for several types of neoplasia. p57KIP2 (CDKN1C) is a maternally expressed gene located on chromosome 11p15.5 which encodes a cyclin-dependent kinase inhibitor that may also act as a tumor suppressor gene. Mutations in ZAC and p57KIP2 have been implicated in transient neonatal diabetes mellitus (TNDB) and Beckwith–Wiedemann syndrome, respectively. Patients with these diseases share many characteristics. Here we show that mouse Zac1 and p57Kip2 have a strikingly similar expression pattern. ZAC, a sequence-specific DNA-binding protein, binds within the CpG island of LIT1 (KCNQ1OT1), a paternally expressed, anti-sense RNA thought to negatively regulate p57KIP2 in cis. ZAC induces LIT1 transcription in a methylation-dependent manner. Our data suggest that ZAC may regulate p57KIP2 through LIT1, forming part of a novel signaling pathway regulating cell growth. Mutations in ZAC may, therefore, contribute to Beckwith–Wiedemann syndrome. Furthermore, we find changes in DNA methylation at the LIT1 putative imprinting control region in two patients with TNDB.
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