A Genome-Wide Linkage Scan for Diabetic Retinopathy Susceptibility Genes in Mexican Americans With Type 2 Diabetes From Starr County, Texas

  1. D. Michael Hallman1,
  2. Eric Boerwinkle1,
  3. Victor H. Gonzalez2,
  4. Barbara E. K. Klein3,
  5. Ronald Klein3 and
  6. Craig L. Hanis1
  1. 1Human Genetics Center, University of Texas Health Science Center at Houston School of Public Health, Houston, Texas
  2. 2Valley Retina Institute, McAllen, Texas
  3. 3Department of Ophthalmology and Visual Sciences, University of Wisconsin–Madison Medical School, Madison, Wisconsin
  1. Address correspondence and reprint requests to Craig L. Hanis, University of Texas Health, Science Center at Houston, P.O. Box 20186, Houston, TX 77225. E-mail: craig.l.hanis{at}uth.tmc.edu

Abstract

We conducted a genome-wide linkage scan for genes contributing to retinopathy risk using 794 diabetes case subjects from 393 Mexican-American families from Starr County, Texas, having at least two diabetic siblings. The sample included 567 retinopathy case subjects comprising 282 affected sibling pairs. Retinopathy was classified as none, early nonproliferative, moderate-to-severe nonproliferative, or proliferative. Using 360 polymorphic markers (average spacing 9.4 cM), we conducted nonparametric linkage analysis followed by ordered-subset analysis (OSA) ranking families by average age of diabetes diagnosis. For any retinopathy, the highest LOD scores including all families were on chromosomes 3 (2.41 at 117 cM) and 12 (2.47 at 15.5). OSA logarithm of odds (LOD) scores >2 for any retinopathy occurred on chromosomes 12 (4.47 at 13.2 cM), 15 (3.65 at 100.6), and 20 (2.67 at 54.1). Scores >2 for either moderate-to-severe nonproliferative or proliferative retinopathy occurred on chromosomes 5 (2.53 at 11.2 cM), 6 (2.28 at 30.6), and 19 (2.21 at 100.6). Thus, unconditional linkage analysis revealed suggestive evidence of linkage with retinopathy on two chromosomes, whereas OSA revealed strong evidence of linkage on two chromosomes, and suggestive evidence on four. Candidate genes were identified in most implicated regions.

Footnotes

  • Published ahead of print at http://diabetes.diabetesjournals.org on 24 January 2007. DOI: 10.2337/db06-1373.

    Additional information can be found in an online appendix at http://dx.doi.org/10.2337/db06-1373.

  • The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked “advertisement” in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

    • Accepted January 9, 2007.
    • Received October 2, 2006.
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  1. Diabetes vol. 56 no. 4 1167-1173
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