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• W1891299758 abstract "Pseudohypoparathyroidism type Ib (PHP1B) is caused by proximal tubular resistance to parathyroid hormone that occurs in most cases in the absence of Albright's Hereditary Osteodystrophy (AHO). Familial forms of PHP1B are caused by maternally inherited microdeletions within STX16, the gene encoding syntaxin 16, or within GNAS, a complex genetic locus on chromosome 20q13.3 encoding Gsα and several splice variants thereof. These deletions lead either to a loss-of-methylation affecting GNAS exon A/B alone or to epigenetic changes involving multiple differentially methylated regions (DMRs) within GNAS. Broad GNAS methylation abnormalities are also observed in most sporadic PHP1B (sporPHP1B) cases. However, with the exception of paternal uniparental disomy involving chromosome 20q (patUPD20q), the molecular mechanism leading to this disease variant remains unknown. We now investigated 23 Japanese sporPHP1B cases, who presented with hypocalcemia, hyperphosphatemia, elevated PTH levels, and occasionally with TSH elevations and mild AHO features. Age at diagnosis was 10.6 ± 1.45 years. Calcium, phosphate, and PTH were 6.3 ± 0.23 mg/dL, 7.7 ± 0.33 mg/dL, and 305 ± 34.5 pg/mL, respectively, i.e. laboratory findings that are indistinguishable from those previously observed for Caucasian sporPHP1B cases. All investigated patients showed broad GNAS methylation changes. Eleven individuals were homozygous for SNPs within exon NESP and a pentanucleotide repeat in exon A/B. Two of these patients furthermore revealed homozygosity for numerous microsatellite markers on chromosome 20q raising the possibility of patUPD20q, which was confirmed through the analysis of parental DNA. Based on this and our previous reports, paternal duplication of the chromosomal region comprising the GNAS locus appears to be a fairly common cause of sporPHP1B that is likely to occur with equal frequency in Caucasians and Asians." @default.
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• W1891299758 date "2015-10-01" @default.
• W1891299758 modified "2023-10-06" @default.
• W1891299758 title "Similar frequency of paternal uniparental disomy involving chromosome 20q (patUPD20q) in Japanese and Caucasian patients affected by sporadic pseudohypoparathyroidism type Ib (sporPHP1B)" @default.
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• W1891299758 doi "https://doi.org/10.1016/j.bone.2015.05.011" @default.
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