English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The term pseudohypoparathyroidism (PHP) refers to different disorders that are caused by mutations within GNAS or upstream of this complex genetic locus. GNAS gives rise to several different transcripts, including Gs alpha (alpha-subunit of the heterotrimeric stimulatory G protein), XL alpha s (extra-large variant of Gs alpha), and several additional sense and antisense transcripts. The complexity of the GNAS locus is furthermore reflected by a parent-specific methylation pattern of most of its different promoters. PHP can be divided into two major groups, PHP type Ia (PHP-Ia) and PHP type Ib (PHP-Ib). PHP-Ia is caused by heterozygous mutations affecting one of the 13 GNAS exons encoding Gs alpha. In contrast, PHP-Ib is caused by heterozygous deletions within STX16, the gene encoding syntaxin 16, which is located more than 220 kb upstream of GNAS, or by deletions within GNAS involving exon NESP55 and two of the antisense exons. In either form of PHP, hormonal resistance develops only after maternal inheritance of the mutation, while paternal inheritance of the same molecular defect is not associated with endocrine abnormalities. In most familial cases of PHP-Ib, there is a loss of exon A/B methylation combined with active A/B transcription from both parental alleles, which leads to suppression of Gs alpha transcription in the proximal renal tubules and, therefore, PTH resistance.

Different Mutations Within or Upstream of the GNAS Locus Cause Distinct Forms of Pseudohypoparathyroidism