Utility and efficiency of linked marker genes for genetic counseling. III. Proportion of informative families under linkage disequilibrium

A. Chakravarti

Research output: Contribution to journalArticlepeer-review

Abstract

A marker locus closely linked to a disease locus is often useful for genetic counseling provided that a counselee is heterozygous at both disease and marker loci. Furthermore, the linkage phase of these genes in the counselee must be known. When the linkage between the disease and marker loci is very close, one often finds linkage disequilibrium between the loci. To evaluate the effect of such nonrandom associations on the utility of linked marker genes for genetic counseling, the proportion of informative families is studied for X-linked recessive and autosomal dominant diseases. This proportion is higher for X-linked genes than for autosomal genes, if other factors are the same. In general, codominant markers are more useful than dominant markers. Also, under appropriate conditions, the proportion of informative families is higher when linkage disequilibrium is present. The results obtained in this paper are useful for evaluating the utility of polymorphic restriction endonuclease cleavage sites as markers in genetic counseling.

Original languageEnglish (US)
Pages (from-to)592-610
Number of pages19
JournalAmerican journal of human genetics
Volume35
Issue number4
StatePublished - 1983

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

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