Document Type

Article

Publication Date

9-15-2009

Comments

This article has been peer reviewed. It is the authors' final version prior to publication in Clinical Orthopaedics and Related Research Volume 468, Issue 2, February 2010, Pages 337-344. The published version is available at DOI: 10.1007/s11999-009-1073-6. Copyright © Springer

Abstract

Developmental dysplasia of the hip (DDH) is a disabling condition of the hip that, depending on geography, can afflict between 20-80% of patients with end-stage arthritis of the hip. Despite its prevalence, the etiology of this disease remains unknown. DDH is a complex disorder with both environmental and genetic causes.. Based on the literature, the candidate genes for the disease are HOXB9, collagen type I α1, and DLX 3. The purpose of our study was to map and characterize the gene or genes responsible for this disorder by family linkage analysis. We recruited one 18-member, multigeneration affected family to provide cheek swabs and blood samples for isolation of DNA. Amplified DNA underwent a total genome scan using GeneChip Mapping 250 K Assay (Affymetrix, Santa Clara, CA). We observed only one region with a LOD score greater than 1.5: a 4Mb region on chromosome 17q21.32, yielding a LOD score of 1.82. While a LOD score of 1.82 does not meet the accepted standard for linkage we interpret these data as suggesting the responsible gene could be linked to this region, which includes a cluster of homeobox regulatory system providing cells with specific positional identities along the developing joint and spine. Discovering the genetic basis of the disease would be an important step in understanding the etiology of the disabling condition.

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