Greig Cephalopolysyndactyly Syndrome: Phenotypic Variability Associated with Variants in Two Different Domains of GLI3.

BACKGROUND

GLI3 is a transcriptional regulator of several genes involved in mammalian skeletal development. Mutations in the pleiotropic gene GLI3 may result in different inherited disorders including Greig cephalopolysyndactyly syndrome (GCPS). GCPS is characterized by mild to severe craniofacial and limb malformations.

METHODS AND RESULTS

Here, we report clinical and molecular study of 3 families with GCPS originated in different regions of Pakistan. Sanger sequencing revealed two novel variants including a frameshift [c. 3790_3791InsC, p.(Gly1236Argfs11)] and a missense [c.1692A>G, p.(His536Arg)], and one previously reported variant [c.1965_1966delAT, p.(His627Glufs48)] located in 2 different domains of the GLI3.

CONCLUSION

This study not only expanded spectrum of the mutations in the but also highlighted phenotypic variability in the GCPS patients. This will facilitate diagnosis and genetic counseling of families with same and related disorders in the Pakistani population.