RT Journal Article SR Electronic T1 Insulin dependent diabetes mellitus (IDDM) and autoimmune thyroiditis in a boy with a ring chromosome 18: additional evidence of autoimmunity or IDDM gene(s) on chromosome 18 JF Journal of Medical Genetics JO J Med Genet FD BMJ Publishing Group Ltd SP 156 OP 158 DO 10.1136/jmg.36.2.156 VO 36 IS 2 A1 C Dacou-Voutetakis A1 A Sertedaki A1 M Maniatis-Christidis A1 C Sarri A1 G Karadima A1 M B Petersen A1 A Xaidara A1 M Kanariou A1 P Nicolaidou YR 1999 UL http://jmg.bmj.com/content/36/2/156.abstract AB A 4 year 3 month old boy with insulin dependent diabetes mellitus (IDDM), autoimmune thyroiditis, slight mental retardation, facial dysmorphism, and a de novo ring chromosome 18 (deletion 18q22.3-18qter) is described. This unique association of defects could represent a chance association. Alternatively, the clinical features could be the result of the chromosomal aberration. If so, one could speculate that a gene or genes on chromosome 18 might act as a suppressor or activator of the autoimmune process by itself or in concert with other IDDM loci.