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Open Access Research article

A novel recessive mutation in the gene ELOVL4 causes a neuro-ichthyotic disorder with variable expressivity

Hina Mir1, Syed Irfan Raza14, Muhammad Touseef2, Mazhar Mustafa Memon1, Muhammad Nasim Khan2, Sulman Jaffar3 and Wasim Ahmad1*

Author Affiliations

1 Department of Biochemistry, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, Pakistan

2 Department of Zoology, University of Azad Jammu and Kashmir, Muzafarabad, Pakistan

3 Shifa College of Medicine, Shifa International Hospital, Sector H-8/4, Islamabad, Pakistan

4 Army Medical College, National University of Science & Technology NUST), Islamabad, Pakistan

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BMC Medical Genetics 2014, 15:25  doi:10.1186/1471-2350-15-25

Published: 26 February 2014

Abstract

Background

A rare neuro-ichthyotic disorder characterized by ichthyosis, spastic quadriplegia and intellectual disability and caused by recessive mutations in ELOVL4, encoding elongase-4 protein has recently been described. The objective of the study was to search for sequence variants in the gene ELOVL4 in three affected individuals of a consanguineous Pakistani family exhibiting features of neuro-ichthyotic disorder.

Methods

Linkage in the family was searched by genotyping microsatellite markers linked to the gene ELOVL4, mapped at chromosome 6p14.1. Exons and splice junction sites of the gene ELOVL4 were polymerase chain reaction amplified and sequenced in an automated DNA sequencer.

Results

DNA sequence analysis revealed a novel homozygous nonsense mutation (c.78C > G; p.Tyr26*).

Conclusions

Our report further confirms the recently described ELOVL4-related neuro-ichthyosis and shows that the neurological phenotype can be absent in some individuals.

Keywords:
Ichthyosis; Phenotypic variability; ELOVL4; Non-sense mutation