The mutational burden and oligogenic inheritance in Klippel-Feil syndrome.

BMC musculoskeletal disorders 2020 Apr 11

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Klippel-Feil syndrome (KFS) represents a rare anomaly characterized by congenital fusion of the cervical vertebrae. The underlying molecular etiology remains largely unknown because of the genetic and phenotypic heterogeneity. We consecutively recruited a Chinese cohort of 37 patients with KFS. The clinical manifestations and radiological assessments were analyzed and whole-exome sequencing (WES) was performed. Additionally, rare variants in KFS cases and controls were compared using genetic burden analysis. We primarily examined rare variants in five reported genes (GDF6, MEOX1, GDF3, MYO18B and RIPPLY2) associated with KFS and detected three variants of uncertain significance in MYO18B. Based on rare variant burden analysis of 96 candidate genes related to vertebral segmentation defects, we identified BAZ1B as having the highest probability of association with KFS, followed by FREM2, SUFU, VANGL1 and KMT2D. In addition, seven patients were proposed to show potential oligogenic inheritance involving more than one variants in candidate genes, the frequency of which was significantly higher than that in the in-house controls. Our study presents an exome-sequenced cohort and identifies five novel genes potentially associated with KFS, extending the spectrum of known mutations contributing to this syndrome. Furthermore, the genetic burden analysis provides further evidence for potential oligogenic inheritance of KFS.

Citation

Ziquan Li, Sen Zhao, Siyi Cai, Yuanqiang Zhang, Lianlei Wang, Yuchen Niu, Xiaoxin Li, Jianhua Hu, Jingdan Chen, Shengru Wang, Huizi Wang, Gang Liu, Ye Tian, Zhihong Wu, Terry Jianguo Zhang, DISCO (Deciphering Disorders Involving Scoliosis and COmorbidities) study, Yipeng Wang, Nan Wu. The mutational burden and oligogenic inheritance in Klippel-Feil syndrome. BMC musculoskeletal disorders. 2020 Apr 11;21(1):220