Does haptoglobin genotype affect early onset of diabetic retinopathy in patients with type 2 diabetes?

Nitza Goldenberg-Cohen, Merav Gabbay, Olga Dratviman-Storobinsky, Ehud Reich, Ruth Axer-Siegel, Dov Weinberger, Uri Gabbay

Research output: Contribution to journalArticlepeer-review

Abstract

Purpose: There are 2 common alleles for Hp (Hp-1 and Hp-2) and 3 common Hp genotypes: Hp1-1, Hp2-1, and Hp2-2. The haptoglobin genotype may play a dual role in morbidities of diabetes: Hp1-1, protective and Hp2-2, provocative. This study investigated the possible association of haptoglobin genotypes with onset of retinopathy in Type 2 diabetes (DM2). Methods: The sample included 98 consecutive adults with DM2 under routine outpatient follow-up from 2007 to 2009 who met the criteria for either no retinopathy at ≥10 years after diagnosis (Group 1) or proliferative retinopathy at ≤10 years after diagnosis (Group 2). Blood samples were collected for haptoglobin genotyping by polymerase chain reaction. Findings were compared between and within groups. Results: Eighty-four patients had no retinopathy and 14 had early proliferative retinopathy. The distributions of the Hp genotypes were as follows: no-retinopathy group: 28.6% Hp1-1, 35.7% Hp2-1, and 35.7% Hp2-2 and proliferative retinopathy group: 22.6% Hp1-1, 27.4% Hp2-1, and 50% Hp2-2 (NS). On statistical analysis (limited to the larger no-retinopathy group), a predominance of Hp1-1 was noted in older patients; Hp2-2 was associated with an increased rate of stroke. Conclusion: The Hp genotype apparently plays no role in the development or worsening of proliferative retinopathy in DM2. Hp1-1 may be involved in delaying the onset of diabetes. Hp2-2 may pose a microvascular risk.

Original languageEnglish
Pages (from-to)1574-1580
Number of pages7
JournalRetina
Volume31
Issue number8
DOIs
StatePublished - Sep 2011

Keywords

  • DM2
  • Hp1-1
  • Hp2-1
  • Hp2-2
  • case-control study
  • diabetic retinopathy
  • early PDR
  • haptoglobin genotype
  • proliferative diabetic retinopathy

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