© 1995 Oxford University Press
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New polymorphic microsatellite markers place the haemochromatosis gene telomeric to D6S105
Department of Haematology, University of Wales College of Medicine Cardiff CF4 4XN 1MRC Molecular Haernatology Unit, Institute of Molecular Medicine, John Radcliffe Hospital College of Oxford OX3 9DU 2Wellcome Centre for Human Genetics, University of Oxford Headington, Oxford OX3 7BN 3Nuffield Department of Medicine, John Radcliffe Hospital Oxford OX3 9DU 4Institute of Liver Studies, King's College School of Medicine and Dentistry London SE5 BRX, UK
*To whom correspondence should be addressed
Received April 21, 1995; Revised July 14, 1995; Accepted July 14, 1995
The haemochromatosis gene (HFE) is linked to both HLA-A and D6S105 on the short arm of chromosome 6 but these markers are separated by
2 Mb of DNA. Most chromosomes carrying HFE have a common haplotype which extends from HLA-A to D6S105 and includes HLA-F. To localise the gene more precisely we have examined 10 microsatellite markers extending over a genetic distance of
5 cM from D6S265 (within 100 kb of HLA-A on the centromeric side) to D6S299 (telomeric). The order of markers is D6S265, HLA-F, D6S258, D6S306, CS3, D6S105, D6S464, CS5, D6S461 and D6S299. We confirm that haemochromatosis appears to originate from a founder mutation which has multiplied in the population through successive generations. This mutation is associated with the haplotype D6S306-5, CS3 D6S105-8, D6S464-9 and CS5-4 which Is found on
70% of HFE chromosomes. We have applied a new and powerful, likelihood analysis for linkage disequilibrium. The maximum value of
(proportion of total possible association between a marker and disease) Is 0.74 for marker CS5 (allele 4). A multipoint analysis also gives a maximum likelihood near marker CS5. We conclude that the HFE gene is likely to be located telomeric of D6S105 and close to CS5.
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