Patrick Revy, France

Imagine Institute / Inserm U1163 Genome Dynamics in the Immune System
Dr Patrick Revy is a research director at the Centre National de la Recherche Scientifique (CNRS). He obtained his PhD degree in immunology in 1999. He co-heads with Jean-Pierre de Villartay an INSERM Team « Genome Dynmics in the Immune System » within the Imagine Institute headed by Pr. Stanislas Lyonnet. The primary goal of the Team is to identify the molecular mechanisms of genetic disorder of the immune system accompanied by DNA repair defect and/or telomere dysfunction in humans. This serves as the basis for both basic studies on the function and the regulation of the immune system and for medical applications in the diagnosis and treatment of diseases. Patrick Revy has contributed to the identification of several molecular defects associating DNA repair/modification or telomere dysfunction with immunodeficiencies including AID, UNG, ATR, RTEL1, Apollo, HEBO, CERNUNNOS. More recently he identified EFL1 mutations as a novel cause of Shwachman-Diamond syndrome, a bone marrow failure syndrome associated with defect in teminal maturation of ribosomes. His work also provided functional information concerning some of these factors. He developed the different techniques required to study the physiology of telomere, DNA replication (including molecular combing), and DNA repair. More recently he developed CRISPR/Cas9 technology to generate KO and KI cell lines and animal models to further analyse the in vivo consequences of defect of some of these fators.

Presenter of 1 Presentation

Parallel Session No Topic Needed

HUMAN TELOMERE BIOLOGY DISORDERS AND NEW INSIGHTS INTO NHP2 DEFICIENCY

Lecture Time
11:30 - 12:00
Room
Bozar
Date
19.09.2019, Thursday
Session Time
11:00 - 12:30
Presentation Topic
No Topic Needed

Abstract

Abstract Body

Telomeres are nucleoprotein structures at the end of chromosomes. The telomerase complex, constituted of the catalytic subunit TERT, the RNA matrix hTR, and several cofactors including the H/ACA box ribonucleoproteins (RNP) Dyskerin, NOP10, GAR1, NAF1, and NHP2, regulates telomere length. In humans, inherited defects in telomere length maintenance are responsible for a wide spectrum of clinical premature aging manifestations including pulmonary fibrosis (PF), dyskeratosis congenita (DC), bone marrow failure (BMF), Immunodeficiency and predisposition to cancer. NHP2 mutations have been so far reported only in two patients with DC. Here, we report the first case of Høyeraal-Hreidarsson syndrome (HH), the severe form of DC, caused by biallelic missense mutations in NHP2. Additionally, we identified three unrelated patients with PF carrying NHP2 heterozygous mutations. Strikingly, one of these patients acquired a somatic mutation in the promoter of TERT that likely conferred a selective advantage in a subset of blood cells. Lastly, we demonstrate that a functional deficit of human NHP2 affects ribosomal RNA biogenesis. Together, our results broaden the functional consequences and clinical spectrum of NHP2 deficiency.

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