TSH Receptor Mutations Among a Consanguineous Community (TSHR)

September 10, 2008 updated by: HaEmek Medical Center, Israel

The Prevalence of TSH Receptor Mutation Among the Arab Population of Israel

Resistance to thyrotropin (RTSH) is a condition of impaired responsiveness of the thyroid gland to TSH, characterized by elevated TSH, low or normal thyroid hormone levels, and hypoplastic or normal-sized thyroid gland.

The aim of the present study was to evaluate the clinical course over time,the genotype-phenotype association and the frequency of two different TSH-receptor (TSHR) mutations in a highly consanguineous population of the town of Um-El-Fahem.

Study Overview

Status

Completed

Conditions

Detailed Description

Resistance to thyrotropin (RTSH) is a syndrome involving reduced sensitivity to TSH. It is characterized by elevated TSH, absence of goiter (normal or hypoplastic thyroid gland) and normal to very low levels of thyroid hormones. The TSH-receptor (TSHR) gene is located on chromosome 14q31 and it consists of extracellular, trans-membrane and intracellular domains. Mutation in the TSHR may cause either gain or loss of function of the receptor. Loss-of-function mutations are autosomal-recessively inherited and lead to a spectrum of phenotypes, ranging from mild euthyroid hyperthyrotropinemia to severe congenital hypothyroidism (CH). Insensitivity to TSH depends on both the severity and location of the TSHR mutations. Since the first report of familial euthyroid hyperthyrotropinemia caused by a TSHR mutation, several cases of loss-of-function mutations of the TSHR have been reported however only a few reports on the outcome of patients affected with TSHR mutations. Whether the condition of euthyroid hyperthyrotropinemia leads to clinical hypothyroidism, remains stable or normalizes over time has yet to be elucidated. We recently described a unique novel TSHR-inactivating mutation located at the third extracellular loop that preferentially affected the inositol phosphate (IP) pathway in three sisters of Arab-Muslim decent that presented with euthyroid hyperthyrotropinemia. Further analysis of the extended family revealed additional members with TSHR syndrome phenotype carrying two different TSHR mutations. All the affected subjects live in the same town. The aim of the present study was to evaluate the clinical course over time, the genotype-phenotype association and the frequency of these two different TSHR mutations among the highly consanguineous population of the town of Um El Fahem.

Study Type

Observational

Enrollment (Actual)

209

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Israel
      • Afula, Israel, 18101
        • Ha'Emek Medical Center
  • United States
    • Illinois
      • Chicago, Illinois, United States, 60637-1470
        • Samuell Refetoff

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Child
  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Sampling Method

Non-Probability Sample

Study Population

Subjects belonging to extended family of the index case

Description

Inclusion Criteria:

  • Subjects belonging to extended family of the index case

Exclusion Criteria:

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

Cohorts and Interventions

Group / Cohort
1
Extended family members
2
Control- subjects from the same town without known thyroid diseases

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Two specific TSHR mutations
Time Frame: Finished
Finished

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

HaEmek Medical Center, Israel

Collaborators

National Institutes of Health (NIH)

Investigators

  • Principal Investigator: Yardena Tenenbaum-Rakover, MD, Ha'Emelk Medical Center,Afula, Israel
  • Principal Investigator: Samuel Refetoff, MD, The University of Chicago, Chicago, Il, USA

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

December 1, 2005

Primary Completion (Actual)

July 1, 2006

Study Completion (Actual)

December 1, 2006

Study Registration Dates

First Submitted

September 4, 2008

First Submitted That Met QC Criteria

September 4, 2008

First Posted (Estimate)

September 5, 2008

Study Record Updates

Last Update Posted (Estimate)

September 11, 2008

Last Update Submitted That Met QC Criteria

September 10, 2008

Last Verified

September 1, 2008

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 920050194
  • 066-2005

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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