Recurrent small variants in NESP55/NESPAS associated with broad GNAS methylation defects and pseudohypoparathyroidism type 1B.

ABSTRACT: Pseudohypoparathyroidism type 1B (PHP1B) is associated with epigenetic changes in the maternal allele of the imprinted GNAS gene that inhibit expression of the α subunit of Gs (Gsα), thereby leading to parathyroid hormone resistance in renal proximal tubule cells where expression of Gsα from the paternal GNAS allele is normally silent. Although all patients with PHP1B show loss of methylation for the exon A/B differentially methylated region (DMR), some patients with autosomal dominant PHP1B (AD-PHP1B) and most patients with sporadic PHP1B have additional methylation defects that affect the DMRs corresponding to exons XL, AS1, and NESP. Because the genetic defect is unknown in most of these patients, we sought to identify the underlying genetic basis for AD-PHP1B in 2 multigenerational fam

SUBMITTER: Li D 

PROVIDER: S-EPMC11665564 | biostudies-literature | 2024 Dec

REPOSITORIES: biostudies-literature