Clinical trial NCT00353639: Telomere Repair Gene Mutation in Inflammatory Bowel Disease
Official title: Telomere Repair Gene Mutations in Inflammatory Bowel Disease
Study type: OBSERVATIONAL
Overall status: COMPLETED
Conditions: Inflammatory Bowel Disease
Keywords: Ulcera
Telomerase
TERT
TERC
SBDS
DNA Helicase
Inflammatory Bowel Disease
IBD
Lead sponsor: National Institutes of Health Clinical Center (CC)
Sponsor class: NIH
First posted: 2006-07-19
Enrollment: 95
Sex: ALL
Minimum age (years): 2
Maximum age (years): 80
Standard ages: CHILD
ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Observational model: CASE_ONLY
Time perspective: CROSS_SECTIONAL
Sampling method: NON_PROBABILITY_SAMPLE
Study population: Subjects with Inflammatory Bowell Disease

Brief summary: This study will evaluate and compare the genes of the telomere repair complex in healthy control subjects, patients with blood diseases, and patients with inflammatory bowel disease to identify what, if any, changes are associated specifically with inflammatory bowel disease.

Patients between 2 and 80 years of age with ulcerative colitis or regional enteritis may be eligible for this study. Participants are recruited from the practice of Dr. Stuart Danovitch, Washington, D.C.

Researchers have established that minor differences in a specific set of genes called the telomere repair complex are related to immune-mediated diseases of the bone marrow. NIH researchers are now interested in whether inflammatory bowel disease and other autoimmune diseases show a similar pattern of genetic differences.

Participants provide a cell sample for evaluation of the telomere repair complex. The sample is collected via buccal swab, a gentle scraping of the inside of the cheek, and stored for use in research.

Detailed description: We have identified inherited mutations in genes of the telomere repair complex in patients with acquired aplastic anemia. These mutations diminish the ability of cells to repair the ends of chromosomes, called telomeres, which normally shorten with each cell division. Mutations in TERC, the gene which encodes for the RNA template of the complex; in TERT, the gene for the enzyme in the complex, and also in the Schwachman-Bodian-Diamond syndrome gene (SBDS), which we believe to be associated with telomere repair, lead to reduced telomerase activity, diminished numbers of hematopoietic cells in the bone marrow, and presumably also a deficiency in the ability of cells to respond to immunological attack and destruction of the hematopoietic system.

This laboratory research protocol will allow us to evaluate whether similar gene mutations might underlie other autoimmune diseases, here specifically, inflammatory bowel disease, which share broad pathophysiologic features with immune-mediated aplastic anemia. We will directly assess by DNA sequencing suspect genes (TERC, TERT, SBDS, DNA helicases and others) in buccal mucosal samples obtained from patients with inflammatory bowel disease (IBD). Analyses from large numbers of controls have defined polymorphisms for these genes. IBD samples will allow us to determine whether mutations in these genes are more prevalent in this patient population and to test the hypotheses that telomere repair defects underlie human autoimmunity, or that these genes are specifically involved in hematology as risks factors for bone marrow failure.

Eligibility criteria: * INCLUSION CRITERIA:

Diagnosis of ulcerative colitis or regional enteritis

For adults:

Ability to comprehend the investigational nature of the study and provide informed consent. Or

For minors: Written informed consent from one parent or guardian and informed assent. The process will be explained to the minor on a level of complexity appropriate for their age and ability to comprehend.

Age greater than 2 but less or equal to 80 years old

EXCLUSION CRITERIA:

All subjects not fulfilling the inclusion criteria will be considered ineligible.

Primary outcomes:
measure: To identify if telomere repair complex gene mutations are abnormally prevalent among patients with IBO.
timeFrame: Ongoing
Secondary outcomes:
measure: To correlate telomere repair gene mutations in subjects with immune mediated disease stratified based on diagnosis as they relate to clinical course and response to therapy.
timeFrame: Ongoing
measure: To compare the telomere repair gene mutations of normal individuals (from large populations studies in the public domain) as well as to those of patients with known bone marrow failure
timeFrame: Ongoing
Other outcomes:
Locations:
city: Bethesda
country: United States
facility: National Institutes of Health Clinical Center, 9000 Rockville Pike
state: Maryland
Study officials:
affiliation: National Heart, Lung, and Blood Institute (NHLBI)
name: Neal S Young, M.D.
role: PRINCIPAL_INVESTIGATOR
References: