title: Exclusion of APC and MCC as the gene defect in one family with familial juvenile polyposis.
abstract: BACKGROUND
  In familial juvenile polyposis, multiple juvenile polyps occur throughout the colon. The genetic defect has not been characterized. The risk of colon cancer is increased, although the magnitude of the increased risk is controversial. The hypothesis of this study was that the genetic defect is within a tumor suppressor gene, possibly one already known to be inactivated in colorectal neoplasia.
  
  
  METHODS
  Linkage analysis using the short tandem repeat polymorphism D5S346 was performed to determine if juvenile polyposis was linked to either APC (adenomatous polyposis coli) or MCC (mutated in colorectal carcinoma) genes within a single large family.
  
  
  RESULTS
  A family in which eight subjects have been affected by juvenile polyposis over three generations is described. Six affected subjects had colectomies in childhood, but the two who have so far survived beyond 35 years of age have developed adenocarcinoma of the jejunum. Within this family, linkage analysis excluded linkage of the juvenile polyposis trait to either APC or MCC.
  
  
  CONCLUSIONS
  In a family with juvenile polyposis with a clear predisposition to malignancy, including carcinoma of the jejunum, APC and MCC were not the defective genes causing the condition.
authors.affiliation: Glaxo Gastroenterology Research Laboratory, Royal Brisbane Hospital Foundation Clinical Research Centre, Bancroft Centre, Herston, Australia.
authors.forename: B A
authors.initials: BA
authors.lastname: Leggett
authors.forename: L R
authors.initials: LR
authors.lastname: Thomas
authors.forename: N
authors.initials: N
authors.lastname: Knight
authors.forename: S
authors.initials: S
authors.lastname: Healey
authors.forename: G
authors.initials: G
authors.lastname: Chenevix-Trench
authors.forename: J
authors.initials: J
authors.lastname: Searle
mesh_terms: D011125:Adenomatous Polyposis Coli / Q000235:genetics*; D000328:Adult; D002648:Child; D015179:Colorectal Neoplasms / Q000235:genetics; D017491:Genes, APC; D017431:Genes, MCC; D008040:Genetic Linkage; D006801:Humans; D007580:Jejunal Neoplasms / Q000235:genetics; D008875:Middle Aged; D009154:Mutation; D010375:Pedigree