Journal Article

A Gene Recently Inactivated in Human Defines a New Olfactory Receptor Family in Mammals

Sylvie Rouquier, Cynthia Friedman, Cécile Delettre, Ger van den Engh, Antoine Blancher, Brigitte Crouau-Roy, Barbara J. Trask and Dominique Giorgi

in Human Molecular Genetics

Volume 7, issue 9, pages 1337-1345
Published in print September 1998 | ISSN: 0964-6906
Published online September 1998 | e-ISSN: 1460-2083 | DOI: http://dx.doi.org/10.1093/hmg/7.9.1337
A Gene Recently Inactivated in Human Defines a New Olfactory Receptor Family in Mammals

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The olfactory receptor (OR) gene family constitutes one of the largest multigene families and is distributed among many chromosomal sites in the human genome. Four OR families have been defined in mammals. We previously demonstrated that a high fraction of human OR sequences have incurred deleterious mutations, thus reducing the repertoire of functional OR genes. In this study, we have characterized a new OR gene, 912–93, in primates. This gene is unique and it defines a new OR family. It localizes to human chromosome 11q11-12 and at syntenical sites in other hominoids. The sequence marks a previously unrecognized rearrangement of pericentromeric material from chromosome 11 to the centromeric region of gibbon chromosome 5. The human gene contains a nonsense point mutation in the region corresponding to the extracellular N–terminus of the receptor. This mutation is present in humans of various ethnic groups, but is absent in apes, suggesting that it probably appeared during the divergence of humans from other apes, <4 000 000–5 000 000 years ago. A second mutation, a frameshift at a different location, has occurred in the gorilla copy of this gene. These observations suggest that OR 912–93 has been recently silenced in human and gorilla, adding to a pool of OR pseudogenes whose growth may parallel a reduction in the sense of smell in primates.

Journal Article.  6237 words.  Illustrated.

Subjects: Genetics and Genomics

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