An apparently dominant bipolar affective disorder (BPAD) locus on chromosome 20p11.2-q11.2 in a large Turkish pedigree

Eur J Hum Genet. 2001 Jan;9(1):39-44. doi: 10.1038/sj.ejhg.5200584.


Bipolar affective disorder (BPAD), also known as manic-depressive illness, is a common complex, polygenic disorder characterised by recurrent cyclic episodes of mania and depression. Family, twin, and adoption studies strongly suggest a genetic predisposition/susceptibility to BPAD, but no genes have yet been identified. We studied a large Turkish pedigree, with an apparently autosomal dominant BPAD, which contained 13 affected individuals. The age of onset ranged from 15-40 with a mean of 25 years. The phenotypes consisted of recurrent manic and major depressive episodes, including suicidal attempts; there was usually full remission with lithium treatment. A genome-wide linkage analysis using a dominant mode of inheritance showed strong evidence for a BPAD susceptibility locus on chromosome 20p11.2-q11.2. The highest 2-point lod score of 4.34 at theta = 0 was obtained with markers D20S604, D20S470, D20S836 and D20S838 using a dominant model with full penetrance. Haplotype analysis enabled the mapping of the BPAD locus in this family between markers D20S186 and D20S109, to a region of approximately 42 cM.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Alleles
  • Bipolar Disorder / genetics*
  • Bipolar Disorder / pathology
  • Chromosome Banding
  • Chromosome Mapping
  • Chromosomes, Human, Pair 20 / genetics*
  • DNA / genetics
  • Family Health
  • Female
  • Genes, Dominant*
  • Genotype
  • Humans
  • Lod Score
  • Male
  • Microsatellite Repeats
  • Middle Aged
  • Pedigree
  • Penetrance
  • Phenotype
  • Turkey


  • DNA