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Journal of Clinical Endocrinology & Metabolism, Vol 70, 346-348, Copyright © 1990 by Endocrine Society

ARTICLES

Lack of preferential transmission of diabetic HLA alleles by healthy parents to offspring in Spanish diabetic families

JM Martin-Villa, JL Vicario, J Martinez-Laso, M Serrano-Rios, G Lledo, A Damiano, F Hawkins, JR Regueiro and A Arnaiz-Villena
Department of Immunology, Hospital 12 de Octubre, Madrid, Spain.

HLA-DR3 or -DR4 segregation distortion to normal or insulin-dependent (ID) diabetic offspring of 108 Spanish families whose parents were healthy was not observed; however, DR3 or DR4 ID offspring is significantly increased in the present study, since parents were chosen after tracing ID children. These results are discrepant with those found by others in families with diabetic parents in other ethnic groups. These conflicting data could be due to sampling errors or segregation distortion. Thus, ethnic group differences in a genetic (T/t-like) or metabolic mechanism might confer advantages to DR3- or DR4-bearing gametes from ID diabetic parents, but segregation distortion might only affect certain HLA DR3 or DR4 extended haplotypes which are frequent and characteristic for certain ethnic groups (i.e. B8-DR3-BfS-C4AQOB1 and Bw62-DR3-BfS-C4A383 in most caucasians) but not for other haplotypes in other ethnic groups (Spaniards; B18-DR3-BfF1- C4A3BQO and BwX-DR4-BfX-C4AXBX).




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