Novel mutations in LRP6 highlight the role of WNT signaling in tooth agenesis.

Novel mutations in LRP6 highlight the role of WNT signaling in tooth agenesis.
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DOI:
10.1038/gim.2016.10
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发表时间:
2016-11
期刊:
Genetics in medicine : official journal of the American College of Medical Genetics
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其他
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在这里,我们的目的是通过在一大群 TA 和 OFC 患者中结合全外显子组测序 (WES) 和靶向重测序来确定牙齿发育不全 (TA) 和/或口颌面裂 (OFC) 的新遗传原因。对两名不相关的患者进行了 WES,其中一名患有严重 TA 和 OFC,另一名仅患有严重 TA。在鉴定出编码低密度脂蛋白受体相关蛋白 6 (LRP6) 的基因中的有害突变后,使用分子倒置探针对 67 名 TA 患者、1,072 名 OFC 患者和 706 名对照患者的所有外显子进行了重新测序。我们在 TA 和 OFC 患者以及仅患有严重 TA 的患者中分别鉴定了 LRP6 中的移码(c.4594delG,p.Cys1532fs)和典型剪接位点突变(c.3398-2A>C,p.?)。靶向重测序显示 TA 患者中独特的 LRP6 变异显着富集,但非综合征性 OFC 中则没有。 TA患者的5个变异中,2个影响经典剪接位点,3个是错义变异;所有变异均与显性表型分离,其中 1 例发生错义突变。 LRP6 突变导致人类牙齿发育不全。
Here we aimed to identify a novel genetic cause of tooth agenesis (TA) and/or orofacial clefting (OFC) by combining whole exome sequencing (WES) and targeted re-sequencing in a large cohort of TA and OFC patients. WES was performed in two unrelated patients, one with severe TA and OFC and another with severe TA only. After identifying deleterious mutations in a gene encoding the low density lipoprotein receptor-related protein 6 (LRP6), all its exons were re-sequenced with molecular inversion probes, in 67 patients with TA, 1,072 patients with OFC and in 706 controls. We identified a frameshift (c.4594delG, p.Cys1532fs) and a canonical splice site mutation (c.3398-2A>C, p.?) in LRP6 respectively in the patient with TA and OFC, and in the patient with severe TA only. The targeted re-sequencing showed significant enrichment of unique LRP6 variants in TA patients, but not in nonsyndromic OFC. From the 5 variants in patients with TA, 2 affect the canonical splice site and 3 were missense variants; all variants segregated with the dominant phenotype and in 1 case the missense mutation occurred de novo. Mutations in LRP6 cause tooth agenesis in man.
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