Original ArticlesRecurrent c.776T>C mutation in CHST3 with four other novel mutations and a literature reviewDuz, Mehmet Bugrahana; Topak, AlibAuthor Information aDepartment of Medical Genetics, Haseki Training and Research Hospital, Health Sciences University, Istanbul bDepartment of Medical Genetics, Health Sciences University Bursa Higher Specialization Training and Research Hospital, Bursa, Turkey Received 26 August 2019 Accepted 11 May 2020 Correspondence to Mehmet Bugrahan Duz, MD, Department of Medical Genetics, Health Sciences University, Haseki Training and Research Hospital, Fatih, Istanbul 34173, Turkey, Tel: +09002124814111; fax: +09002124532000; e-mail: [email protected] Clinical Dysmorphology: October 2020 - Volume 29 - Issue 4 - p 167-172 doi: 10.1097/MCD.0000000000000329 Buy Metrics Abstract The chondrodysplasia with congenital joint dislocations, CHST3 type, which was distinguished by predominantly contractures, marked vertebral changes, and normal facial appearance. Although, some clinical clues can be used for differential diagnosis, it is mostly too difficult to discriminate one type from another on basis of clinical findings only. Eight patients with multiple dislocations from five unrelated families were included in this study to elucidate molecular diagnoses. Clinical exome sequencing (CES) was performed on one patient from each family. Variable degree vertebral changes, pes equinovarus, and kyphoscoliosis accompanied multiple dislocations and short stature. In CES analyses, all mutations showed in CHST3. Previously reported c.776T>C homozygous mutations were detected in two families, compound heterozygous novel c.740G>C and c.881T>C mutations were found in one family, and homozygous novel c.564C>A and c.963G>A mutations were also determined in remaining two families, separately. Biallelic CHST3 c.776T>C mutations are most frequent mutation in CHST3 and have been reported predominantly in Turkish patients which may be remarkable for genotype-ethnicity correlation in chondrodysplasia with congenital joint dislocations, CHST3 type. It is suggested that c.776T>C mutation can be accepted as a recurrent mutation in CHST3 for Turkish patients who are suspected of having chondrodysplasia with congenital joint dislocations, CHST3 type. Copyright © 2020 Wolters Kluwer Health, Inc. All rights reserved.