hrp0089s1.2 | Recent developments in the understanding of Hypothalamo-pituitary disorders | ESPE2018

Stem Cells in the Pituitary: A Role for Regeneration?

Rizzoti Karine

During morphogenesis, embryonic progenitors proliferate, differentiate and establish the shape of the future organs and tissues. In the mature organism, a certain degree of plasticity and potential for regeneration is retained as most organs maintain a population of adult stem cells sharing important similarities with embryonic progenitors; they are characterized by the ability to both self-renew and differentiate into the full range of the specialized cell types corresponding...

hrp0098s6.2 | Novel Insights into Pituitary Disorders | ESPE2024

Early postnatal pituitary stem cells mostly generate gonadotrophs.

Rizzoti Karine

The reproductive axis comprises the hypothalamus, the pituitary gland and the gonads. While all its components are assembled in the embryo, it only starts to be active postnatally, initially during a transient period known as minipuberty. Activity is re-initiated at puberty which marks the onset of reproductive capacity. The hypothalamic gonadotrophin releasing hormone (GnRH) has a central regulatory role because it controls production and secretion of the two gonadotrophins, ...

hrp0095p1-348 | Pituitary, Neuroendocrinology and Puberty | ESPE2022

A homozygous Y443C variant in the RNPC3 is associated with severe syndromic congenital hypopituitarism and diffuse brain atrophy

Bezen Diğdem , Kutlu Orkide , Mouilleron Stephane , Rizzoti Karine , Dattani Mehul , Guran Tulay , Yeşil Gözde

Context: Biallelic RNPC3 variants have been reported in a few patients with growth hormone deficiency, either in isolation or in association with central hypothyroidism, congenital cataract, neuropathy, developmental delay/intellectual deficiency, hypogonadism and pituitary hypoplasia.Objective: To describe a new case with syndromic congenital hypopituitarism and diffuse brain atrophy due to RNPC3 mutations and to compar...

hrp0092fc11.2 | Pituitary, Neuroendocrinology and Puberty Session 2 | ESPE2019

A Novel Minor Spliceosome Defect Associated with Growth Hormone Deficiency (GHD) and Primary Ovarian Insufficiency (POI)

Akin Leyla , Gregory Louise , Buonocore Federica , Group GOSgene , Kurtoglu Selim , Kendirci Mustafa , Burçin Gonen Z. , Lovell-Badge Robin , Rizzoti Karine , Dattani Mehul

Objectives: We describe 5 pedigrees with a novel phenotype including GHD associated with primary ovarian insufficiency (POI) and investigate the underlying molecular basis.Patients and Methods: 6 Turkish patients (5F, 1M) born to 5 consanguineous pedigrees with severe GHD were identified. All females had POI; the male had normal puberty. All had severe postnatal growth retardation (height -4.4 to -8.9 SDS at presentation...