Clinical and Genetic Studies in Families With Myopia and Related Diseases

This study is currently recruiting participants. (see Contacts and Locations)
Verified August 2014 by National Institutes of Health Clinical Center (CC)
Sponsor:
Information provided by:
National Institutes of Health Clinical Center (CC)
ClinicalTrials.gov Identifier:
NCT00272376
First received: January 5, 2006
Last updated: August 29, 2014
Last verified: August 2014
  Purpose

This study will examine the inheritance of myopia in families of various nationalities and ethnic backgrounds to identify gene changes that cause myopia or similar diseases and to better understand these conditions. In patients with myopia, the eye does not focus light accurately on the retina (tissue that lines the back of the eye), so that objects at a distance appear blurry. Myopia may occur alone, with other vision problems such as retinal dislocations, cataract or glaucoma, or with other problems such as joint or skin problems.

People with myopia (usually those from families with several affected members) and control subjects with normal vision may be eligible for this study.

Each participant undergoes the following procedures:

  • Blood draw for genetic testing related to the disorders under study
  • Medical and family history, including drawing a family tree to explore vision problems in the family
  • Complete eye examination, including refraction (pupil dilation) and visual acuity testing, photographs of the retina and possibly lens, and specialized tests to measure field of vision, color vision and ability to see in the dark

Condition
Myopia

Study Type: Observational
Study Design: Time Perspective: Retrospective
Official Title: Clinical and Molecular Studies in Families With Myopia and Related Diseases

Further study details as provided by National Institutes of Health Clinical Center (CC):

Primary Outcome Measures:
  • Statistically significant linkage [ Designated as safety issue: No ]

Estimated Enrollment: 2000
Study Start Date: December 2005
Detailed Description:

Objective: This project, Clinical and Molecular Studies in Families with Myopia and Related Diseases will study the inheritance of myopia in families of many nationalities and ethnic backgrounds in order to identify the genes that, when mutated, cause myopia, high myopia, or similar diseases and the pathophysiology through which they act.

Study Population: The number of subjects to be enrolled has no logical upper limit, but will be at least 250 and not more than 2000 during the next 5 years. The study consists of ascertaining individuals and especially families with multiple individuals, affected by myopia or related ocular diseases.

Design: These patients and their families will undergo detailed ophthalmological examinations and, where indicated, additional non-investigational examinations to characterize disease in their families and determine their affectation status. A blood sample will be collected from each individual for isolation of DNA and in some individual s biochemical studies or for lymphoblastoid transformation to establish a renewable source of DNA. Linkage analysis, physical mapping, and mutational screening will be carried out to identify the specific the gene and the mutations in it that are associated with myopia in this family. If necessary, the gene product or blood sample will be characterized biochemically. The study will enroll subjects at the NEI and at collaborating centers including the Zhongshan Ophthalmic Center of Sun Yat-Sen University, Guangzhou, China.

Outcome Measures: Linkage will be determined using the lod score method and mutations in specific genes will be assessed using a combination of residue conservation, blosum score, and molecular modeling. Biochemical, metabolic, and physiological effects will be individualized to the specific assay.

  Eligibility

Ages Eligible for Study:   4 Years and older
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No
Criteria
  • INCLUSION CRITERIA:

    1. Individuals or family members of individuals with myopia, either congenital, childhood, or older.
    2. Adults must be capable of providing their own consent.
    3. All subjects must be able to cooperate with study examination and phlebotomy.
    4. Older than 4 years of age.

EXCLUSION CRITERIA:

  1. Diseases, infections, or trauma that mimic primary myopia.
  2. Children requiring sedation for study procedures.
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT00272376

Contacts
Contact: James F Hejtmancik, M.D. (301) 435-1598 f3h@helix.nih.gov

Locations
United States, Maryland
National Institutes of Health Clinical Center, 9000 Rockville Pike Recruiting
Bethesda, Maryland, United States, 20892
Contact: For more information at the NIH Clinical Center contact Patient Recruitment and Public Liaison Office (PRPL)    800-411-1222 ext TTY8664111010    prpl@mail.cc.nih.gov   
China
Zhongshan Ophthalmic Center, Sun Yat-sen University Recruiting
Guangzho, China
Sponsors and Collaborators
Investigators
Principal Investigator: James F Hejtmancik, M.D. National Eye Institute (NEI)
  More Information

Additional Information:
Publications:
ClinicalTrials.gov Identifier: NCT00272376     History of Changes
Other Study ID Numbers: 060058, 06-EI-0058
Study First Received: January 5, 2006
Last Updated: August 29, 2014
Health Authority: United States: Federal Government

Keywords provided by National Institutes of Health Clinical Center (CC):
Myopia
Nearsightedness

Additional relevant MeSH terms:
Myopia
Eye Diseases
Refractive Errors

ClinicalTrials.gov processed this record on October 20, 2014