First Report of Two Egyptian Patients with Desbuquois Dysplasia due to Homozygous CANT1 Mutations.

Autor:	Thomas MM; Human Genetics and Genome Research Division, Clinical Genetics Department, National Research Centre, Cairo, Egypt., Ashaat EA; Human Genetics and Genome Research Division, Clinical Genetics Department, National Research Centre, Cairo, Egypt., Otaify GA; Human Genetics and Genome Research Division, Clinical Genetics Department, National Research Centre, Cairo, Egypt., Ismail S; Human Genetics and Genome Research Division, Clinical Genetics Department, National Research Centre, Cairo, Egypt., Essawi ML; Human Genetics and Genome Research Division, Medical Molecular Genetics Department, National Research Centre, Cairo, Egypt., Abdel-Hamid MS; Human Genetics and Genome Research Division, Medical Molecular Genetics Department, National Research Centre, Cairo, Egypt., Hassan HA; Human Genetics and Genome Research Division, Medical Molecular Genetics Department, National Research Centre, Cairo, Egypt., Alsaiedi SA; Pediatric Department, Cairo University, Cairo, Egypt., Aglan M; Human Genetics and Genome Research Division, Clinical Genetics Department, National Research Centre, Cairo, Egypt., El Ruby MO; Human Genetics and Genome Research Division, Clinical Genetics Department, National Research Centre, Cairo, Egypt., Temtamy S; Human Genetics and Genome Research Division, Clinical Genetics Department, National Research Centre, Cairo, Egypt.
Jazyk:	angličtina
Zdroj:	Molecular syndromology [Mol Syndromol] 2021 Aug; Vol. 12 (5), pp. 279-288. Date of Electronic Publication: 2021 Jul 22.
DOI:	10.1159/000516607
Abstrakt:	Desbuquois dysplasia type 1 (DBQD1) is a very rare skeletal dysplasia characterized by growth retardation, short stature, distinct hand features, and a characteristic radiological monkey wrench appearance at the proximal femur. We report on 2unrelated Egyptian patients having the characteristic features of DBQD1 with different expressivity. Patient 1 presented at the age of 45 days with respiratory distress, short limbs, faltering growth, and distinctive facies while patient 2 presented at 5 years of age with short stature and hypospadias. The 2 patients shared radiological features suggestive of DBQD1. Whole-exome sequencing revealed a homozygous frameshift mutation in the CANT1 gene (NM_001159772.1:c.277_278delCT; p.Leu93ValfsTer89) in patient 1 and a homozygous missense mutation (NM_138793.4:c.898C>T; p.Arg300Cys) in patient 2. Phenotypic variability and variable expressivity of DBQD was evident in our patients. Hypoplastic scrotum and hypospadias were additional unreported associated findings, thus expanding the phenotypic spectrum of the disorder. We reviewed the main features of skeletal dysplasias exhibiting similar radiological manifestations for differential diagnosis. We suggest that the variable severity in both patients could be due to the nature of the CANT1 gene mutations which necessitates the molecular study of more cases for phenotype-genotype correlations. Competing Interests: The authors have no conflicts of interest to declare. (Copyright © 2021 by S. Karger AG, Basel.)
Databáze:	MEDLINE
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