Gene First Approach to Connective Tissue Disease

Overview

Background: Elastic fibers affect parts of the body that stretch repetitively, such as the skin, blood vessels, and lungs. Researchers want to use medical and research tests in patients with already identified changes in a set of connective tissue genes to better understand diseases related to elastic fibers. Objective: To learn more about the impact of underlying changes in a set of connective tissue genes on people s overall health. Eligibility: People ages 2-100 who have had a gene test that identified a change in a gene that affects elastic fibers. Initial emphasis will be placed on people with changes in ELN, LOX, MFAP4, FBLN5 and EFEMP2. Design: Participants will visit the NIH for several days to perform tests that will help researchers learn more about how changes in connective tissue genes affect a person s health. They will also have clinicians take their medical history and physical exam. Optional tests include giving blood samples, hair strand, urine, and/or saliva samples. They may have a cheek swab or skin biopsy. Their genes may be studied. Their cells may be grown in a laboratory. Participants may have photographs taken of the face and body. They will receive exams by a medical team with experience in connective tissue disease. They may have a dental exam or eye exams and with photography. During the eye exam, pictures may be taken of the blood vessels in the eyes. If this occurs, they will get dye through an intravenous (IV) line in an arm vein. They will also have medical tests to check the health of tissues that may be affected by these connective tissue genes. Participants may have lung function tests. They may have a six-minute walk test. They may complete a treadmill or bike stress test. Their heart s electrical activity may be recorded. Participants may have X-rays and ultrasounds. They may have a DEXA scan to measure bone density. They may have CT, MRI or other imaging scans. Some of these tests require the participant to get a contrast fluid via IV. Participants may have a skin elasticity test using a suction cup that pulls lightly on their skin. Participants may wear blood pressure cuffs while probes are placed on their skin. The tests will be chosen for each individual based on their specific gene change and no person is expected to complete all tests. Participation will last 3-5 days.

Study Description: This protocol will allow deep phenotyping of patients with underlying gene variation in a set of connective tissue genes (see Appendix A for list) to both quantify risk of specific disease features and to describe novel phenotypes attributable to gene variation. Study Objectives: Primary Objective: Phenotypic description for patients with known variation in specified connective tissue genes. Secondary Objective: Within and across gene correlation of variant type with specific phenotype outcomes. Endpoints: Primary Endpoint: We will quantify the frequency of a set phenotypic observations for patients with variation in specified connective tissue genes. Organ systems under evaluation are those predicted to be affected based on gene expression or previous medical record investigations by our collaborators at Geisinger Health System. Secondary Endpoint: We will compare the frequency of specified phenotypes within genes in patients with specific genotypes and across connective tissue genes. Different variation type (stop gain vs missense) or location (in or out of a functional domain) has the potential to cause different phenotypic outcomes. Likewise, variation in genes impacting the same pathways may have overlapping phenotypes/outcomes.