Familial atopy in Australian pedigrees: adventitious linkage to chromosome 8 is not confirmed nor is there evidence of linkage to the high affinity IgE receptor

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Abstract
Atopy frequently displays autosomal dominant inheritance and recent studies have favoured genetic linkage between atopy and the human chromosome 11q13. We have studied 12 extended families with aggregation of atopy consistent with autosomal dominant inheritance. The families have been studied for linkage of asthma and atopy to loci on chromosome 8p following the observation that one family suggested preliminary evidence of linkage to an anonymous hypervariable locus cloned from a DNA fingerprint and mapped to 8pter-p22. Subsequent analysis shows this putative linkage to be adventitious as the remaining 11 families do not support linkage between atopy and 8p. We have analysed the same families for evidence of linkage of atopy to loci on 11q13. In these families there is no evidence of association between atopy and the 11q loci stronger than that expected by chance alone; furthermore there is no suggestion that a subpopulation of these families display linkage between atopy and the loci. In addition neither the 8p loci nor the 11q loci exhibit evidence of linkage to atopy by affected sib-pair analysis. This also conflicts with previously published data for 11q.