title: A missense mutation in TMEM67 causes Meckel-Gruber syndrome type 3 (MKS3): a family from China.
abstract: Meckel-Gruber syndrome (MKS) is a lethal autosomal recessive condition characterized by renal cysts and variably associated features, including developmental anomalies of the central nervous system (typically encephalocele), hepatic ductal dysplasia and cysts, and polydactyly. Genetic heterogeneity has been demonstrated at eleven loci, MKS1-11. Here, we present the clinical and molecular characteristics of a Chinese MKS3 family with occipital encephalocele and kidney enlargement. DNA sequencing of affected fetuses revealed a homozygous c.1645C>T substitution in exon 16 of TMEM67, leading to a p.R549C substitution in meckelin. The R549 residue is highly conserved across human, rat, mouse, zebrafish, chicken, wolf and platypus genomes. Hha I restriction analysis demonstrated that the c.1645C>T mutation was absent in 200 unrelated control chromosomes of Chinese background, supporting the hypothesis that it represents causative mutation, not rare polymorphism. Our data provide additional molecular and clinical information for establishing a better genotype-phenotype understanding of MKS.
authors.affiliation: Department of Obstetrics and Gynecology, Chinese PLA General Hospital Beijing 100853, China.
authors.forename: Manli
authors.initials: M
authors.lastname: Zhang
authors.affiliation: Institute of Otolaryngology, Chinese PLA General Hospital Beijing 100853, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Cheng
authors.affiliation: Department of Pathology, Chinese PLA General Hospital Beijing 100853, China.
authors.forename: Aijun
authors.initials: A
authors.lastname: Liu
authors.affiliation: Department of Ultrasound, Chinese PLA General Hospital Beijing 100853, China.
authors.forename: Longxia
authors.initials: L
authors.lastname: Wang
authors.affiliation: Department of Obstetrics and Gynecology, Chinese PLA General Hospital Beijing 100853, China.
authors.forename: Lihua
authors.initials: L
authors.lastname: Xiong
authors.affiliation: Department of Obstetrics and Gynecology, Chinese PLA General Hospital Beijing 100853, China.
authors.forename: Meixia
authors.initials: M
authors.lastname: Chen
authors.affiliation: Department of Otolaryngology, Wuhan General Hospital Wuhan 430070, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Sun
authors.affiliation: Fuzhou General Hospital of Nanjing Command PLA Fuzhou 350025, China.
authors.forename: Jianzhong
authors.initials: J
authors.lastname: Li
authors.affiliation: Institute of Otolaryngology, Chinese PLA General Hospital Beijing 100853, China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Lu
authors.affiliation: Institute of Otolaryngology, Chinese PLA General Hospital Beijing 100853, China.
authors.forename: Huijun
authors.initials: H
authors.lastname: Yuan
authors.affiliation: Department of Obstetrics and Gynecology, Chinese PLA General Hospital Beijing 100853, China.
authors.forename: Yali
authors.initials: Y
authors.lastname: Li
authors.affiliation: Department of Obstetrics and Gynecology, Chinese PLA General Hospital Beijing 100853, China.
authors.forename: Yanping
authors.initials: Y
authors.lastname: Lu
mesh_terms: D000015:Abnormalities, Multiple / Q000235:genetics; D002681:China; D002925:Ciliary Motility Disorders / Q000235:genetics*; D004252:DNA Mutational Analysis; D004677:Encephalocele / Q000235:genetics*; D005190:Family; D006801:Humans; D008565:Membrane Proteins / Q000235:genetics*; D020125:Mutation, Missense; D007690:Polycystic Kidney Diseases / Q000235:genetics*
chemical_list: D008565:Membrane Proteins; C468846:TMEM67 protein, human
keywords: MKS3; TMEM67; meckelin; mutation