Novel ALOX12B Mutation Identified in Parents following Single Nucleotide Polymorphism Microarray Testing of Banked DNA from a Fatal Case of Congenital Ichthyosis.

Abstract:

:In genetically and phenotypically heterogeneous conditions like ichthyosis, it is clinically not possible to predict mutation in a specific gene. Sequential testing of all the causative genes is time consuming and expensive. In consanguineous families with autosomal recessive genetically heterogeneous disorders, it is possible to narrow down the candidate gene/genes by recognizing the regions of homozygosity by a single nucleotide polymorphism (SNP) array. Here, we present a fatal case of autosomal recessive severe congenital ichthyosis born to a consanguineous couple. Two candidate genes were recognized by SNP array on banked DNA of the subject. Sequencing of these candidate genes in parents found them to be carriers of the same variation, a novel heterozygous deletion of single nucleotide in exon 8 (c. 1067delT) of ALOX12B gene. The present case illustrates the utility of DNA banking, SNP array and testing of parents to arrive at a definitive molecular diagnosis, essential for genetic counseling, and prenatal testing.

journal_name

Indian J Dermatol

authors

Salian S,Gupta A,Shukla A,Girisha KM

doi

10.4103/0019-5154.174134

subject

Has Abstract

pub_date

2016-01-01 00:00:00

pages

122

issue

1

eissn

0019-5154

issn

1998-3611

pii

IJD-61-122b

journal_volume

61

pub_type

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