Genetic Study of the FBN1 Gene and Fibrillin-1 Abnormalities in Choctaw Native Americans and Other Patients With Systemic Sclerosis

National Center for Research Resources (NCRR)

Status: Unknown

Conditions: Systemic Sclerosis

Study type: Observational

Funder types: Other; NIH

Identifiers

NCT00006393

NCRR-M01RR02558-0104

UT-H-HSC-MS-96-206

Details and patient eligibility

About

OBJECTIVES: I. Determine whether defects in fibrillin-1 cellular processing are present in the tsk1 mouse model that carries a known FBN1 gene rearrangement and in a population of Choctaw Native American patients with systemic sclerosis who have a strong genetic predisposition to the disease.

II. Determine the ultrastructural features of fibrillin-1 in these patients. III. Screen the FBN1 gene for mutations beginning at the regions homologous to the tsk1 duplication and latent transforming growth factor binding proteins in these patients and in an unaffected Choctaw control group.

IV. Determine the correlation between fibrillin-1 abnormalities and clinical presentation, autoantibodies, and ethnicity.

Full description

PROTOCOL OUTLINE:

Patients undergo punch skin biopsy obtained from the upper arm or back. Studies of fibrillin-1 synthesis and cellular processing, and FBN1 mutational analysis, linkage analysis, and genetic mapping are performed on the tissue samples. Patients from all major US ethnic groups (Caucasian, Hispanic, African Americans) will be recruited for the study in the next 2 years.

Sex: All

Volunteers: Accepts Healthy Volunteers

Inclusion and exclusion criteria

PROTOCOL ENTRY CRITERIA:

--Disease Characteristics--

Diagnosis of systemic sclerosis in accordance with the American College of Rheumatology preliminary criteria

Positive for systemic sclerosis antibodies (e.g., anticentromere, antitopo, antifibrillarin, or antiRNA polymerase)