Clinical Research Directory

Genotype-Phenotype Study of Patients With Plaquenil -Induced Retinal Toxicity, With Evaluation of the ABCA4 Gene

Background: \- Plaquenil (hydroxychloroquine) is an anti-inflammatory drug that is used to treat some autoimmune diseases such as lupus and rheumatoid arthritis. This drug can damage the retina by causing a condition called plaquenil-induced retinal toxicity, which may lead to vision loss. However, most people taking plaquenil do not develop this problem. Researchers are interested in studying whether differences in a person s genes explain why some people develop plaquenil-induced retinal toxicity while others do not. Objectives: \- To investigate possible correlations between certain genes or genetic mutations and plaquenil-induced retinal toxicity. Eligibility: * Individuals at least 18 years of age who have previously used plaquenil. * Both individuals who have and have not developed plaquenil-induced retinal toxicity will be eligible for this study. Design: * The study requires one or two visits to the National Eye Institute or an outpatient study clinic over a maximum 2-year period. * Participants will provide a personal and family medical history, and will have a full eye examination. * Participants will also provide blood samples for testing. * No treatment will be provided as part of this protocol.

Genotyping GUided Antiplatelet theRapy in pAtieNts Treated With Drug Eluting stEnts (GUARANTEE)

The aim of this study is to assess the efficacy and safety of the CYP2C19 genotype guided antiplatelet treatment strategy, using clopidogrel in non-carriers of a CYP2C19\*2 or \*3 allele and ticagrelor in carriers of a CYP2C19\*2 or \*3 allele in patients treated with new generation drug eluting stents.

Natural History Study of Inherited Retinal Diseases

This prospective, observational investigation seeks to delineate the interplay between chromatic vision deficits and both functional visual outcomes and anatomical retinal biomarkers in individuals affected by Inherited Retinal Dystrophies (IRDs). The study will recruit approximately 200 subjects, encompassing a heterogeneous population of IRD patients-spanning a range of genotypes and clinical severities-as well as control participants devoid of retinal pathology. All enrolled individuals will undergo a standardized battery of evaluations, including quantitative color vision assessment, best-corrected visual acuity (BCVA) determination, and advanced multimodal retinal imaging. The principal aim is to characterize the relationship between impairments in color discrimination and morphologic disruptions within the outer retinal layers, with particular emphasis on the continuity and reflectivity of the ellipsoid zone (EZ)-historically referred to as the inner segment/outer segment (IS/OS) junction-assessed through spectral-domain optical coherence tomography (SD-OCT). Further, the study will explore associations between chromatic perceptual deficits and underlying genetic mutations, mutation patterns specific to IRD subtypes, and the influence of patient age on the severity and progression of color vision loss. A key secondary objective is the clinical appraisal and validation of a novel diagnostic modality, the Moji Low-Vision Color Discrimination Test (Moji Test), which is specifically engineered to quantify residual color perception in individuals with advanced central visual impairment. The test's discriminatory capacity will be benchmarked against established color vision testing paradigms to assess its reliability, clinical sensitivity, and suitability for implementation in populations with severe visual acuity reduction. By incorporating a genetically and phenotypically diverse IRD cohort, the study is designed to enable granular, stratified analyses that will refine the understanding of structural-functional correlations in hereditary retinal disease. The inclusion of a control group with preserved retinal architecture and normal color vision function will provide essential normative baselines for comparative evaluation and statistical inference.

Phenotype - Genotype Correlation in a Sample of Egyptian Patients With Congenital Myopathies and Congenital Muscular Dystrophies

The aim of this study is to correlate the phenotype and genotype among a sample of Egyptian patients with Congenital myopathies and Congenital muscular dystrophies.

The Study of the Phenotype of Hereditary Xerocytosis

Hereditary xerocytosis is a dominant red blood cell membrane disorder characterized by an increased leakage of potassium from the interior to the exterior of the red blood cell membrane, leading to water loss, red cell dehydration, and chronic hemolysis. In 90% of cases, it is associated with heterozygous gain-of-function mutations in PIEZO1, a gene that encodes a mechanotransducer responsible for converting mechanical stimuli into biological signals. The remaining 10% of cases are linked to mutations in the GARDOS channel gene.

AI-Driven Genotype Prediction Using EHR and Multimodal Data

The goal of this clinical study is to explore the potential of using electronic health records (EHR) and multimodal data (such as imaging, lab results, and clinical history) to predict a patient's genotype. The study will evaluate whether predictive models based on this non-genetic data can accurately infer genetic information, which traditionally requires direct genetic testing.

FAMILY INHERITANCE, GENE-GENE AND GENE-ENVIRONMENT INTERACTIONS IN THE FIELD OF CARDIOVASCULAR AND RENAL DISEASES. Fifth Visit of the STANISLAS Cohort

The Stanislas Cohort is a monocentric familial longitudinal cohort originally comprised of 1006 families consisting of two parents and at least two biological children and deemed healthy, recruited in 1993-1995 at the Centre for Preventive Medicine of Nancy. This cohort was established with the primary objective of investigating gene-gene and gene-environment interactions in the field of cardiovascular diseases. The 5th visit of the STANISLAS Cohort will allow a better evaluation of the cardiovascular ageing of the population and the transition toward cardiovascular or renal diseases in relation with their genetic profile and environment.