RESEARCH SUPPORT, NON-U.S. GOV'T
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A homoallelic Gly317-->Asp mutation in ALPL causes the perinatal (lethal) form of hypophosphatasia in Canadian mennonites.

Genomics 1993 July
We have discovered a single homoallelic nucleotide substitution as the putative cause of the perinatal (lethal) form of hypophosphatasia in Canadian Mennonites. Previous linkage and haplotype analysis in this population suggested that a single mutational event was responsible for this autosomal recessive form of hypophosphatasia. The mutation is a guanosine-to-adenosine substitution at nucleotide position 1177 in exon 10 of the tissue nonspecific (liver/bone/kidney) alkaline phosphatase gene. This Gly317-->Asp mutation segregates exclusively with the heterozygote phenotype we previously assigned by biochemical testing (maximum combined lod score of 18.24 at theta = 0.00). This putative disease-causing mutation has not been described in controls nor in other non-Mennonite probands with both lethal and nonlethal forms of hypophosphatasia studied to date. This Gly317-->Asp mutation changes a polar glycine to an acidic aspartate at amino acid position 317 within the highly conserved active site region of the 507-amino-acid polypeptide. Carrier screening for this lethal mutation in our high-risk population is now feasible.

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