Department of Pediatrics, UTHealth McGovern Medical School, Houston, TX, 77030, USA.
Pediatric Research Center, UTHealth McGovern Medical School, Houston, TX, 77030, USA.
Hum Genet. 2020 Oct;139(10):1261-1272. doi: 10.1007/s00439-020-02169-9. Epub 2020 Apr 21.
Nonsyndromic cleft lip with or without cleft palate (NSCLP) is a common birth defect for which only ~ 20% of the underlying genetic variation has been identified. Variants in noncoding regions have been increasingly suggested to contribute to the missing heritability. In this study, we investigated whether variation in craniofacial enhancers contributes to NSCLP. Candidate enhancers were identified using VISTA Enhancer Browser and previous publications. Prioritization was based on patterning defects in knockout mice, deletion/duplication of craniofacial genes in animal models and results of whole exome/whole genome sequencing studies. This resulted in 20 craniofacial enhancers to be investigated. Custom amplicon-based sequencing probes were designed and used for sequencing 380 NSCLP probands (from multiplex and simplex families of non-Hispanic white (NHW) and Hispanic ethnicities) using Illumina MiSeq. The frequencies of identified variants were compared to ethnically matched European (CEU) and Los Angeles Mexican (MXL) control genomes and used for association analyses. Variants in mm427/MSX1 and hs1582/SPRY1 showed genome-wide significant association with NSCLP (p ≤ 6.4 × 10). In silico analysis showed that these enhancer variants may disrupt important transcription factor binding sites. Haplotypes involving these enhancers and also mm435/ABCA4 were significantly associated with NSCLP, especially in NHW (p ≤ 6.3 × 10). Importantly, groupwise burden analysis showed several enhancer combinations significantly over-represented in NSCLP individuals, revealing novel NSCLP pathways and supporting a polygenic inheritance model. Our findings support the role of craniofacial enhancer sequence variation in the etiology of NSCLP.
非综合征性唇裂伴或不伴腭裂(NSCLP)是一种常见的出生缺陷,其潜在遗传变异仅有约 20%得到鉴定。越来越多的证据表明,非编码区的变异可能导致遗传缺失。在这项研究中,我们研究了颅面增强子的变异是否会导致 NSCLP。候选增强子是通过 VISTA Enhancer Browser 和以前的出版物鉴定的。基于基因敲除小鼠的形态缺陷、动物模型中颅面基因的缺失/重复以及外显子组/全基因组测序研究的结果对候选增强子进行了优先级排序。这导致了 20 个颅面增强子被纳入研究。设计了定制的基于扩增子的测序探针,用于对 380 名 NSCLP 先证者(来自非西班牙裔白人(NHW)和西班牙裔的多重和单倍家庭)进行测序,使用的是 Illumina MiSeq。鉴定的变异的频率与种族匹配的欧洲(CEU)和洛杉矶墨西哥裔(MXL)对照基因组进行比较,并用于关联分析。mm427/MSX1 和 hs1582/SPRY1 中的变异与 NSCLP 存在全基因组显著关联(p≤6.4×10)。计算机分析表明,这些增强子变异可能破坏了重要的转录因子结合位点。涉及这些增强子以及 mm435/ABCA4 的单倍型与 NSCLP 显著相关,尤其是在 NHW 中(p≤6.3×10)。重要的是,分组负担分析显示,在 NSCLP 个体中,几种增强子组合显著过表达,揭示了新的 NSCLP 途径,并支持多基因遗传模型。我们的研究结果支持颅面增强子序列变异在 NSCLP 发病机制中的作用。
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