title: An extension of the Maximum Lod Score method to X-linked loci.
abstract: The Maximum Lod Score method for affected relative-pair analysis, introduced by Risch, is a powerful method for detecting linkage between an autosomal marker locus and disease. In order to use the method to detect linkage to markers on the X-chromosome, some modification is necessary. Here we extend the method to be applicable to X-chromosomal data, and derive genetic restrictions on the haplotype-sharing probabilities analogous to the 'possible triangle' restrictions described by Holmans for the autosomal case. Size criteria are derived using asymptotic theory and simulation, and the power is calculated for a number of possible underlying models. The method is applied to data from 284 type 1 diabetic families and evidence is found for the presence of one or more diabetogenic loci on the X-chromosome.
authors.affiliation: Nuffield Department of Surgery, Wellcome Trust Centre for Human Genetics, University of Oxford.
authors.forename: H J
authors.initials: HJ
authors.lastname: Cordell
authors.forename: Y
authors.initials: Y
authors.lastname: Kawaguchi
authors.forename: J A
authors.initials: JA
authors.lastname: Todd
authors.forename: M
authors.initials: M
authors.lastname: Farrall
mesh_terms: D000483:Alleles; D003922:Diabetes Mellitus, Type 1 / Q000235:genetics*; D005260:Female; D008040:Genetic Linkage / Q000235:genetics*; D005819:Genetic Markers / Q000235:genetics; D006801:Humans; D008126:Lod Score; D008297:Male; D008957:Models, Genetic; D010375:Pedigree; D012737:Sex Factors; D014960:X Chromosome / Q000235:genetics*
chemical_list: D005819:Genetic Markers