Abstract
Shwachman-Diamond syndrome (SDS) is an autosomal recessive disorder characterised by exocrine pancreatic dysfunction, haematological and skeletal abnormalities. We have previously defined the SDS locus as a 2.7 cM interval spanning the centromere of chromosome 7. To facilitate additional analysis of this complex and poorly characterised region, a framework of ordered genetic markers at 7p11-q11, including six newly identified, has been constructed using somatic cell, radiation hybrid and STS-content mapping. We have identified shared disease haplotypes, that recur in unrelated families of common ethnic origin, and extend across the SDS locus. Detection of ancestral and intrafamilial recombination events in patients refined the SDS locus to a 1.9 cM interval at 7q11, which contains the tyrosylprotein sulfotransferase 1 (TPST1) gene. Patients with SDS were screened for mutations in TPST1 by sequencing of exons and intron–exon junctions. Two single nucleotide polymorphisms, but no disease-causing mutations, were identified. In addition, Southern blot analysis yielded no evidence of large-scale mutations, and RT–PCR analysis failed to detect alterations in expression. These results exclude TPST1 as the causative gene for SDS. The established map of the refined SDS locus will assist in the identification and characterisation of other candidate genes for SDS.
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Acknowledgements
We are grateful for the co-operation of the patients with SDS, their families, and their physicians. We thank the Canadian Institutes of Health Research (CIHR) Genome Resource Facility at HSC for YAC and BAC library screening. We also acknowledge support from Shwachman-Diamond Canada, Shwachman Support of Great Britain, The Harrison Wright Appeal, Shwachman-Diamond Support of Australia, Shwachman-Diamond Support International, and the CIHR. JM Rommens is a member of the Canadian Genetic Diseases Network (CGDN). M Popovic received a joint CGDN-HSC Award and an Ontario Graduate Scholarship. S Goobie received a Postgraduate Scholarship from the Natural Sciences and Engineering Research Council of Canada.
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Popovic, M., Goobie, S., Morrison, J. et al. Fine mapping of the locus for Shwachman-Diamond syndrome at 7q11, identification of shared disease haplotypes, and exclusion of TPST1 as a candidate gene. Eur J Hum Genet 10, 250–258 (2002). https://doi.org/10.1038/sj.ejhg.5200798
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DOI: https://doi.org/10.1038/sj.ejhg.5200798
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