Table of Contents
ISRN Genetics
Volume 2013 (2013), Article ID 951202, 4 pages
http://dx.doi.org/10.5402/2013/951202
Research Article

Mutation Screening of Elongation Factor 2 in Shwachman-Diamond Syndrome Patients Lacking Mutations in the SBDS Gene

1Laboratory of Molecular Pathology, University Hospital of Verona, Piazzale Stefani, 37126 Verona, Italy
2Cystic Fibrosis Center, University Hospital of Verona, Piazzale Stefani, 37126 Verona, Italy

Received 10 October 2012; Accepted 27 October 2012

Academic Editors: B. Blaumeiser, B.-H. Jeong, J. Moreaux, and M. Romkes

Copyright © 2013 Elena Nicolis and Marco Cipolli. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Shwachman-Diamond syndrome is an autosomal recessive disorder characterized by bone marrow failure, pancreatic insufficiency, and skeletal abnormalities. Mutations in SBDS gene explain, by literature, 90% of SDS cases. The Italian experience shows that only the 5% of individuals diagnosed as affected by SDS on clinical and hematological grounds lack mutations in the SBDS gene. It is well established that SBDS protein is essential for the assembly of mature ribosomes. The yeast SBDS ortholog functions within a pathway containing elongation factor-like 1, homologous to human GTPase elongation factor-2, to promote the release and recycling of the nucleolar shuttling factor Tif6 from cytoplasmic pre-60S subunits in a cascade targeted to form the active ribosome. We considered that mutations of genes that disrupt pathways shared by SBDS may result in disease with comparable clinical features. EEF2 was evaluated as a candidate gene by mutation screening in clinically defined SDS which lack mutations in the SBDS gene. To date, no deleterious mutations were found in EEF2 in four Italian patients without SBDS mutations, but with a clinical diagnosis of SDS.