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| Tracking Information | |
|---|---|
| First Received Date ICMJE | November 3, 1999 |
| Last Updated Date | March 3, 2008 |
| Start Date ICMJE | October 1996 |
| Primary Completion Date | |
| Current Primary Outcome Measures ICMJE | |
| Original Primary Outcome Measures ICMJE | |
| Change History | Complete list of historical versions of study NCT00001609 on ClinicalTrials.gov Archive Site |
| Current Secondary Outcome Measures ICMJE | |
| Original Secondary Outcome Measures ICMJE | |
| Descriptive Information | |
| Brief Title ICMJE | Studies of Families With Hereditary Cataracts |
| Official Title ICMJE | Clinical and Molecular Studies in Families With Congenital or Hereditary Cataracts |
| Brief Summary | The objective of this study is to discover the genes responsible for the development of hereditary cataracts in families. A cataract is clouding of the lens of the eye that obstructs the passage of light and may impair vision. Information from this study may provide a better understanding of why hereditary cataracts form and perhaps lead to the development of a test that can predict who will likely be affected and to what degree. Patients or family members of patients with inherited cataracts who participate in this study will be asked questions about their family history, especially concerning eye disease or cataracts, and a family tree will be drawn. They will undergo a complete eye examination, including photographs to document the clarity or opacity of the lens. In addition, a small blood sample will be drawn for use in gene mapping studies of inherited cataract. |
| Detailed Description | Although the etiology of some secondary cataracts is becoming better understood and certain animal models have the promise to elucidate the relationships between lens crystallin and hereditary cataract, little is known about the causes of congenital cataracts in humans. Even the classification of different types of cataracts is cumbersome and imperfect. A better understanding of cataractogenesis will come through an understanding of the molecular components of the lens of the eye and the ways in which lesions of these components are manifested structurally and functionally as opacity of the lens. It is well known that cataracts exhibit marked genetic heterogeneity. In mice and humans, hereditary cataracts have been shown to result from lesions at many distinct loci and those cataracts corresponding to one locus can be morphologically heterogeneous, implying that environmental factors may modify the phenotype of the cataract which a molecular lesion causes. Nonetheless, molecular biological characterization of cataracts in the mouse and guinea pig has suggested that alterations in lens crystallins can cause hereditary cataracts making them reasonable candidate genes for causing hereditary cataracts in humans. In addition, it is apparent that hereditary lesions which mimic or contribute additively to environmental stresses known to cause cataracts might be candidate genes for causing hereditary cataracts. This knowledge increases the feasibility of genetic linkage studies and provides a rationale basis on which to begin the molecular analysis of naturally occurring hereditary cataracts. Therefore, it is the purpose of this protocol to concentrate upon hereditary cataracts. |
| Study Phase | |
| Study Type ICMJE | Observational |
| Study Design ICMJE | |
| Condition ICMJE |
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| Intervention ICMJE | |
| Study Arms / Comparison Groups | |
| Publications * |
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* Includes publications given by the data provider as well as publications identified by National Clinical Trials Identifier (NCT ID) in Medline. |
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| Recruitment Information | |
| Recruitment Status ICMJE | Completed |
| Enrollment ICMJE | 1200 |
| Completion Date | March 2003 |
| Primary Completion Date | |
| Eligibility Criteria ICMJE | The proband must have documentation of congenital or hereditary cataract. Patients with cataract due to radiation, steroid, or associated with other ocular diseases such as uveitis, retinitis pigmentosa etc. and age-related cataracts will be excluded. |
| Gender | Both |
| Ages | |
| Accepts Healthy Volunteers | No |
| Contacts ICMJE | Contact information is only displayed when the study is recruiting subjects |
| Location Countries ICMJE | United States |
| Administrative Information | |
| NCT ID ICMJE | NCT00001609 |
| Responsible Party | |
| Study ID Numbers ICMJE | 970009, 97-EI-0009 |
| Study Sponsor ICMJE | National Eye Institute (NEI) |
| Collaborators ICMJE | |
| Investigators ICMJE | |
| Information Provided By | National Institutes of Health Clinical Center (CC) |
| Verification Date | March 2003 |
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ICMJE Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP |
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