Localization of a recessive gene for North American Indian childhood cirrhosis to chromosome region 16q22-and identification of a shared haplotype

Am J Hum Genet. 2000 Jul;67(1):222-8. doi: 10.1086/302993. Epub 2000 May 11.

Abstract

North American Indian childhood cirrhosis (NAIC, or CIRH1A) is an isolated nonsyndromic form of familial cholestasis reported in Ojibway-Cree children and young adults in northwestern Quebec. The pattern of transmission is consistent with an autosomal recessive mode of inheritance. To map the NAIC locus, we performed a genomewide scan on three DNA pools of samples from 13 patients, 16 unaffected siblings, and 22 parents from five families. Analysis of 333 highly polymorphic markers revealed 3 markers with apparent excess allele sharing among affected individuals. Additional mapping identified a chromosome 16q segment shared by all affected individuals. When the program FASTLINK/LINKAGE was used and a completely penetrant autosomal recessive mode of inheritance was assumed, a maximum LOD score of 4.44 was observed for a recombination fraction of 0, with marker D16S3067. A five-marker haplotype (D16S3067, D16S752, D16S2624, D16S3025, and D16S3106) spanning 4.9 cM was shared by all patients. These results provide significant evidence of linkage for a candidate gene on chromosome 16q22.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Alleles
  • Child
  • Cholestasis / genetics
  • Chromosome Mapping
  • Chromosomes, Human, Pair 16 / genetics*
  • Female
  • Genes, Recessive / genetics*
  • Genetic Markers / genetics
  • Haplotypes / genetics*
  • Humans
  • Indians, North American / genetics*
  • Liver Cirrhosis / genetics*
  • Lod Score
  • Male
  • Models, Genetic
  • Pedigree
  • Penetrance
  • Polymorphism, Genetic / genetics
  • Quebec
  • Software

Substances

  • Genetic Markers