Abstract
Investigation of one kindred with autosomal recessive isolated hypoparathyroidism, which had resulted from a consanguineous marriage, has identified a g to c substitution in the first nucleotide of intron 2 of the parathyroid hormone (PTH) gene. This donor splice mutation could be detected by restriction enzyme cleavage with DdeI, and this revealed that the patients were homozygous for the mutant alleles, the unaffected relatives were heterozygous, and unrelated normals were homozygous for the wild type alleles. Defects in messenger RNA splicing were investigated by the detection of illegitimate transcription of the PTH gene in lymphoblastoid cells. The mutation resulted in exon skipping with a loss of exon 2, which encodes the initiation codon and the signal peptide, thereby causing parathyroid hormone deficiency.
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Parkinson, D., Thakker, R. A donor splice site mutation in the parathyroid hormone gene is associated with autosomal recessive hypoparathyroidism. Nat Genet 1, 149–152 (1992). https://doi.org/10.1038/ng0592-149
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DOI: https://doi.org/10.1038/ng0592-149
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