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Chediak-Higashi Syndrome: Novel Mutation of the CHS1/LYST Gene in 3 Omani Patients

Al-Tamemi, Salem MD, FRCPC; Al-Zadjali, Shoaib PhD; Al-Ghafri, Fahad MD; Dennison, David MBBS, MD

Journal of Pediatric Hematology/Oncology: May 2014 - Volume 36 - Issue 4 - p e248–e250
doi: 10.1097/MPH.0000000000000025
Online Articles: Clinical and Laboratory Observations

Background: Chediak-Higashi syndrome (CHS) is a rare, autosomal, recessive lysosomal disorder with hematological and immunologic abnormalities; however, stem-cell transplantation from a matched or related donor may be curative. Many mutations of the CHS1/LYST gene have been reported to date. We report a novel nonsense mutation of the CHS1/LYST gene in 3 Omani patients.

Methods and Results: Three patients from 2 different families presented with clinical and laboratory features of CHS and a history of death of a previous sibling because of a severe illness, suggestive of the accelerated phase of CHS. Giant granules were present in the myeloid cell lines. Before the stem-cell transplant, the first patient underwent gene sequencing of all exons of the lysosome trafficking regulator (CHS1/LYST) gene and revealed a nonsense mutation in exon 5 (c.925C>T, p.R309X). Subsequently, upon presentation, the second and third patients’ direct gene sequencing of exon 5 revealed the same mutation.

Conclusions: We report a nonsense mutation in exon 5 (c.925C>T, p.R309X). This supports the allelic heterogeneity of CHS and is in line with most reported mutation types that lead to a truncated protein. Identification of the mutation type will facilitate timely diagnosis, management, and family counseling for those with affected children in Oman.

Departments of *Child Health

Hematology, Sultan Qaboos University Hospital, Muscat, Oman

The authors declare no conflict of interest.

Reprints: Salem Al-Tamemi, MD, FRCPC, Department of Child Health, Sultan Qaboos University Hospital, P.O. Box 96, PC 123 SQU, Muscat, Oman (e-mails: tamemi@squ.edu.om; drtamemi@gmail.com).

Received March 13, 2013

Accepted August 20, 2013

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