Letters

Reanalysis of twin studies suggests that diabetes is mainly genetic

BMJ 2001; 323 doi: http://dx.doi.org/10.1136/bmj.323.7319.997/a (Published 27 October 2001) Cite this as: BMJ 2001;323:997
  1. Edwin A M Gale, professor ([email protected]),
  2. Polly J Bingley, senior lecturer,
  3. George S Eisenbarth, professor,
  4. Maria J Redondo, postdoctoral fellow,
  5. Kirsten O Kyvik, professor,
  6. Jacob S Petersen, head of islet discovery research
  1. Diabetes/Metabolism, Southmead Hospital, Bristol BS10 5NB
  2. Barbara Davis Center for Childhood Diabetes, University of Colorado Health Sciences Center, Denver, CL 80262, USA
  3. Genetic Epidemiology Research Unit, Institute of Community Health, Odense University, DK-5000 Odense, Denmark
  4. Novo Nordisk, Novo Alle (1KO3), 2880 Bagsvaerd, Denmark

    EDITOR—Two twin studies of type 1 diabetes have reached opposite conclusions. In one, a population based cohort of Danish twins in which one or both cotwins had type 1 diabetes was studied for the presence of islet autoantibodies.1 High rates of autoantibody positivity were identified in twins with and without diabetes. Since positivity did not differ between the monozygotic and dizygotic twins it was suggested that a shared intrauterine or early postnatal environment might be more important than genetic factors. The second study found that the prevalence of islet autoantibodies was lower in initially unaffected dizygotic twins than monozygotic twins and did not differ from that found in unaffected non-twin siblings. The authors concluded that islet autoimmunity is determined predominantly …

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