Clinical and Genetic Studies of Families With Congenital or Hereditary Cataracts
|First Received Date ICMJE||March 22, 2003|
|Last Updated Date||April 26, 2014|
|Start Date ICMJE||March 2003|
|Primary Completion Date||Not Provided|
|Current Primary Outcome Measures ICMJE
||statistically significant linkage|
|Original Primary Outcome Measures ICMJE||Not Provided|
|Change History||Complete list of historical versions of study NCT00056771 on ClinicalTrials.gov Archive Site|
|Current Secondary Outcome Measures ICMJE||Not Provided|
|Original Secondary Outcome Measures ICMJE||Not Provided|
|Current Other Outcome Measures ICMJE||Not Provided|
|Original Other Outcome Measures ICMJE||Not Provided|
|Brief Title ICMJE||Clinical and Genetic Studies of Families With Congenital or Hereditary Cataracts|
|Official Title ICMJE||Clinical and Molecular Studies in Families With Congenital or Hereditary Cataracts|
This study will explore the clinical and hereditary (genetic) features of inherited cataracts. A cataract is a clouding of the eye lens, which focuses light on the back of the eye. When the lens becomes cloudy and does not let light through, vision is impaired. Cataracts may be associated with vision problems alone, or with other problems, such as changes in facial appearance or skin problems. A better understanding of these genetic conditions may help in the development of better diagnostic tests.
Patients with inherited cataracts and their family members may be eligible for this study. Participants will be drawn from patients enrolled in other studies of inherited cataracts at the NEI and collaborating clinics.
Participants will undergo the following tests and procedures:
Objective: This project, Clinical and Molecular Studies in Families with Congenital or Hereditary Cataracts will study the inheritance of genetic cataracts, both Mendelian and complex age related cataracts, in families of many nationalities and ethnic backgrounds in order to identify the genes that, when mutated, cause cataracts and the pathophysiology through which they act.
Study Population: Families of many nationalities and ethnic backgrounds. We will study a maximum or 5,000 patients and family members.
Design: The study consists of ascertaining individuals, and especially families with multiple individuals, affected by both congenital and age related cataracts. These patients and their families will undergo detailed ophthalmological examinations to characterize their cataracts and determine their affectation status. A blood sample will be collected from each individual for isolation of DNA and in some individuals 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 cataracts in this family. If necessary, the gene product will be characterized biochemically. The study will enroll subjects at NEI and collaborating institutions, the Centre for Excellence in Molecular Biology, Lahore, Pakistan, the Zhongshan Ophthalmic Center, Guangzhou, China, the Aravind Eye Hospital, Madurai, India, and the University of Parma, Italy and the All India Institute of Medical Sciences (AIIMS).
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.
|Study Type ICMJE||Observational|
|Study Design ICMJE||Time Perspective: Prospective|
|Target Follow-Up Duration||Not Provided|
|Sampling Method||Not Provided|
|Study Population||Not Provided|
|Intervention ICMJE||Not Provided|
|Study Group/Cohort (s)||Not Provided|
* Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
|Recruitment Status ICMJE||Recruiting|
|Estimated Enrollment ICMJE||5000|
|Completion Date||Not Provided|
|Primary Completion Date||Not Provided|
|Eligibility Criteria ICMJE||
Subjects with the following will be recruited:
|Ages||4 Years and older|
|Accepts Healthy Volunteers||No|
|Location Countries ICMJE||India, Pakistan, United States, Italy, China|
|NCT Number ICMJE||NCT00056771|
|Other Study ID Numbers ICMJE||030123, 03-EI-0123|
|Has Data Monitoring Committee||Not Provided|
|Responsible Party||Not Provided|
|Study Sponsor ICMJE||National Eye Institute (NEI)|
|Collaborators ICMJE||Not Provided|
|Information Provided By||National Institutes of Health Clinical Center (CC)|
|Verification Date||April 2014|
ICMJE Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP