title: Similar anti-mitochondrial antibody reactivity profiles in familial primary biliary cirrhosis.
abstract: OBJECTIVE
  : Familial accumulation of primary biliary cirrhosis (PBC) has been documented. To examine the importance of genetic factors, we carried out family study of the disease with a particular focus on the reactivity profiles of anti-mitochondrial antibodies (AMA).
  
  
  METHODS
  : Eighty-five patients with PBC that we experienced in the period of 1982-2003 were investigated, retrospectively. Twelve patients from a total of six families were investigated clinically and immunologically.
  
  
  RESULTS
  : Of the 85 patients, 5 (5.9%) were found to have a family history of PBC. The six PBC family relationships consisted of four cases of sisters and two cases of a mother and daughter. HLA haplotypes were identical in two cases and were half-similar in the other cases. AMA titers were almost the same in three families and in five of the six families, sera from individual members within the family showed similar AMA-reactive bands in immunoblotting.
  
  
  CONCLUSIONS
  : The prevalence of PBC is strikingly increased in family members (frequency of 5.9%). Sera from PBC patients of the same family showed the same AMA reactivity profile, suggesting that development of AMA may be greatly influenced by certain underlying genetic factors. Large-scale genomic studies of familial PBC will be critical to identify mechanisms of disease susceptibility.
authors.affiliation: The Department of Gastroenterology and Hepatology, Kochi Medical School, Nankoku, Kochi 783-8505, Japan.
authors.forename: Yoshizumi
authors.initials: Y
authors.lastname: Hayase
authors.forename: Shinji
authors.initials: S
authors.lastname: Iwasaki
authors.forename: Naoaki
authors.initials: N
authors.lastname: Akisawa
authors.forename: Toshiji
authors.initials: T
authors.lastname: Saibara
authors.forename: Yoshiko
authors.initials: Y
authors.lastname: Kadokawa
authors.forename: Katsuhisa
authors.initials: K
authors.lastname: Omagari
authors.forename: Takashi
authors.initials: T
authors.lastname: Maeda
authors.forename: Saburo
authors.initials: S
authors.lastname: Onishi