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HLA associations

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It is believed the HLA region on the short arm of chromosome 6 (ie, the IDDM1 locus) is responsible for one-half of the genetic susceptibility that leads to risk of type 1 diabetes (1)

  • the strongest associations with T1D is seen in HLA class II type
    • in Caucasians, particularly DR4-DQ8, are associated with a high risk of T1D, however, the exact HLA types may vary among different ethnic groups
  • class I MHCs also seem to influence risk for type 1 diabetes, independent of class II molecules (1,2)

In addition certain DQ alleles which code for an amino acid other than aspartate at position 57 of the beta chain and/or arginine at position 52 of the alpha chain are significantly more common in the diabetic population. Interestingly DR2 is protective against IDDM. There are also associations with certain HLA class 1 antigens, for example B8 and B15.

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Last edited 11/2018

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