Different pattern of epigenetic changes of the GNAS gene locus in patients with pseudohypoparathyroidism type Ic confirm the heterogeneity of underlying pathomechanisms in this subgroup of pseudohypoparathyroidism and the demand for a new classification of GNAS-related disorders.

Abstract excerpt

CONTEXT: Disorders characterized by PTH resistance are grouped within the term pseudohypoparathyroidism type I (PHPI). Most subtypes of this disease are caused by genetic or epigenetic changes of the GNAS locus leading to deficiency of the α-subunit of stimulatory G proteins (Gsα). Because the in vitro measured Gsα protein activity is normal in pseudohypoparathyroidism Ic (PHPIc), it had previously been...

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