Ellis-van Creveld syndrome in adulthood: extending the clinical spectrum

Ellis-van Creveld Syndrome: A Rare Case Report with Emphasis on Skeletal Manifestations

Introduction

Ellis-van Creveld syndrome (EVC) is a rare autosomal recessive disorder characterized by growth retardation, dysplastic nails, cardiac defects, dental abnormalities, and polydactyly. Early diagnosis and multidisciplinary management are essential for improving patient outcomes.

Case Report

We present a case of a 12-year-old male with EVC, born to consanguineous parents, who presented with bilateral bowing of the legs and difficulty walking. The patient exhibited classic features of EVC, including short stature, bilateral polydactyly, dysplastic nails, dental anomalies, and a history of cardiac defects. Radiological evaluation confirmed the diagnosis.

Conclusion

This case highlights the importance of early diagnosis and comprehensive management in EVC syndrome. Recognizing the characteristic clinical features is key to timely intervention and improved quality of life.

An intrafamilial phenotypic variability in Ellis-Van Creveld syndrome due to a novel 27 bps deletion mutation

Ellis-van Creveld (EvC) syndrome is an autosomal recessive disease, characterized by ectodermal, skeletal, and cardiac anomalies. We report intrafamilial phenotypic variability in three new EvC syndrome cases. Affected males in this study showed only ectodermal abnormalities, whereas an affected female showed the classical presentation of EvC Syndrome, including bilateral postaxial polydactyly of hands and feet, and congenital heart defects. Whole exome sequencing was performed to identify the causative variant, followed by validation and segregation analysis using Sanger sequencing. A homozygous deletion variant (c.731_757del) was identified in exon 6 of the EVC gene (NM_153717.2). The identified variant is considered to be the most likely candidate variant for the EvC syndrome in the family based on previous reports validating the role of EVC variants in the EvC syndrome. The disease correctly segregated in the family members, as all affected members were homozygous, and obligate carriers were heterozygous. Our family is remarkable in highlighting the variable expressivity of the EvC phenotype within the same family, due to a homozygous deletion mutation in the EVC gene. The variable expressivity might be due to the hypomorphic nature of mutation, or the presence of additional variants in modifier genes or in the regulatory regions of the EVC/EVC2 genes.

Identification of a novel EVC variant in a Han-Chinese family with Ellis-van Creveld syndrome

Background

Ellis‐van Creveld syndrome (EVC), a very rare genetic skeletal dysplasia, is clinically characterized by a tetrad consisting of chondrodystrophy, polydactyly, ectodermal dysplasia, and cardiac anomalies. The aim of this study was to identify the genetic defect for EVC in a five‐generation consanguineous Han‐Chinese pedigree.

Methods

A five‐generation, 12‐member Han‐Chinese pedigree was enrolled in this study. Exome sequencing was applied in the proband to screen potential genetic variant(s), and then Sanger sequencing was used to identify the variant in family members and 200 unrelated ethnicity‐matched controls.

Results

A novel homozygous variant, c.2014C>T, p.(Q672*), in the EvC ciliary complex subunit 1 gene (EVC), was detected in the patient, which was cosegregated with the disease in the family and absent in the controls.

Conclusion

The identified novel homozygous EVC variant, c.2014C>T, p.(Q672*), was responsible for EVC in this Han‐Chinese pedigree. The findings in this study extend the EVC mutation spectrum and may provide new insights into EVC causation and diagnosis with implications for genetic counseling and clinical management.