Telomere Repair Gene Mutation in Inflammatory Bowel Disease

Inflammatory Bowel Disease Clinical Trial

Official title:

Telomere Repair Gene Mutations in Inflammatory Bowel Disease

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT00353639
• Other study ID #: 060082
• Secondary ID: 06-H-0082
• Status: Completed
• Start date: May 15, 2006
• Est. completion date: May 21, 2020

Study information

• Verified date: May 2020
• Source: National Institutes of Health Clinical Center (CC)
• Contact: n/a
• Is FDA regulated: No
• Study type: Observational

Clinical Trial 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.

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.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 95
• Est. completion date: May 21, 2020
• Est. primary completion date: May 15, 2006
• Accepts healthy volunteers: No
• Gender: All
• Age group: 2 Years to 80 Years

Eligibility

• 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.

Related Conditions & MeSH terms

• Inflammatory Bowel Disease
• Inflammatory Bowel Diseases
• Intestinal Diseases

Locations

Country	Name	City	State
United States	National Institutes of Health Clinical Center, 9000 Rockville Pike	Bethesda	Maryland

Sponsors (1)

Lead Sponsor	Collaborator
National Heart, Lung, and Blood Institute (NHLBI)

Country where clinical trial is conducted

United States, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	To identify if telomere repair complex gene mutations are abnormally prevalent among patients with IBO.	To identify if telomere repair complex gene mutations are abnormally prevalent among patients with IBO.	Ongoing
Secondary	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.	We aim to correlate telomere repair gene mutations in subjects with immune mediated disease stratified based on diagnosis with clinical course and response to therapy.	Ongoing
Secondary	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	We aim to compare the telomere repair gene mutations of normal individuals with those of patients with known bone marrow failure	Ongoing

External Links

•   NIH Clinical Center Detailed Web Page