The Detection of Steroid Sulfatase Gene Deletion(STS) in Egyptian Males With X-linked Ichthyosis
October 2010 | Volume 9 | Issue 10 | Original Article | 1192 | Copyright © October 2010
Mahmoud F. Abdel Hamed, Hassan A. Hussein, Nivine A. Helmy, Mohamed L. Elsaiea,
Background: Ichthyosis is a disorder of keratinization characterized by diffuse uniform and persistent scales resulting from abnormal
epidermal differentiation or metabolism. The identification of steroid sulfatase (STS) as the cause of X-linked ichthyosis (XLI) points to
the importance of this enzyme in skin desquamation. Fluorescent in situ hybridization (FISH) analysis is a good diagnostic technique
with which to detect a common deletion of the STS gene.
Objective: In this study, the authors set out to detect the X-linked type of ichthyosis, diagnosed by detection of STS gene deletions
among Egyptian males.
Methodology: Egyptian males complaining of X-linked ichthyosis were clinically examined, evaluating pedigree analysis of the family,
cytogenetic studies using G-banding technique and FISH using locus specific probe for stereoid sulfatase (STS) gene which is
located at chromosome Xp22.3.
Results: Of patients, 11.11 percent had nocturnal enuresis and 33.33 percent showed STS gene deletion by FISH analysis.
Conclusion: This study underlines a difficulty in diagnosing X-linked ichthyosis on the clinical features or familial pedigree analysis in
Egypt and the importance of cytogenetic and molecular cytogenetic studies for diagnosis. FISH analysis is a good, reliable and rapid
diagnostic tool with which to detect STS gene deletion. Since FISH will not detect partial deletion or point mutations, the authors
recommend further molecular studies to reach the proper diagnosis of X-linked ichthyosis.