Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/7287
Title: ORMDL proteins are a conserved new family of endoplasmic reticulum membrane proteins
Author: Tusón Segarra, Miquel
Marfany i Nadal, Gemma
Herrero, Enric
Balcells Comas, Susana
Gonzàlez-Duarte, Roser
Hjelmqvist, Lars
Keywords: Evolució
Biologia cel·lular
Genètica
Evolution
Cell biology
Genetics
Issue Date: 2002
Publisher: BioMed Central
Abstract: Background: Annotations of completely sequenced genomes reveal that nearly half of the genes identified are of unknown function, and that some belong to uncharacterized gene families. To help resolve such issues, information can be obtained from the comparative analysis of homologous genes in model organisms. Results: While characterizing genes from the retinitis pigmentosa locus RP26 at 2q31-q33, we have identified a new gene, ORMDL1, that belongs to a novel gene family comprising three genes in humans (ORMDL1, ORMDL2 and ORMDL3), and homologs in yeast, microsporidia, plants, Drosophila, urochordates and vertebrates. The human genes are expressed ubiquitously in adult and fetal tissues. The Drosophila ORMDL homolog is also expressed throughout embryonic and larval stages, particularly in ectodermally derived tissues. The ORMDL genes encode transmembrane proteins anchored in the endoplasmic reticulum (ER). Double knockout of the two Saccharomyces cerevisiae homologs leads to decreased growth rate and greater sensitivity to tunicamycin and dithiothreitol. Yeast mutants can be rescued by human ORMDL homologs. Conclusions: From protein sequence comparisons we have defined a novel gene family, not previously recognized because of the absence of a characterized functional signature. The sequence conservation of this family from yeast to vertebrates, the maintenance of duplicate copies in different lineages, the ubiquitous pattern of expression in human and Drosophila, the partial functional redundancy of the yeast homologs and phenotypic rescue by the human homologs, strongly support functional conservation. Subcellular localization and the response of yeast mutants to specific agents point to the involvement of ORMDL in protein folding in the ER.
Note: Reproducció del document publicat a http://dx.doi.org/10.1186/gb-2002-3-6-research0027
It is part of: Genome Biology, 2002, vol. 3, núm. 6
URI: http://hdl.handle.net/2445/7287
Related resource: http://dx.doi.org/10.1186/gb-2002-3-6-research0027
ISSN: 1465-6914
Appears in Collections:Articles publicats en revistes (Genètica, Microbiologia i Estadística)

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