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Genetic markers for retinitis pigmentosa
D Y Wang1, W M Chan, P O S Tam
1Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Hong Kong Eye Hospital, 147K Argyle Street, Hong Kong.
Hong Kong Medical Journal = Xianggang Yi Xue Za Zhi
|August 9, 2005
Summary
Recent advances in retinitis pigmentosa genetics have identified numerous mutations and genetic markers. While genetic testing is becoming feasible, complex inheritance patterns still challenge genetic counseling.
Area of Science:
- Ophthalmology
- Medical Genetics
Background:
- Retinitis pigmentosa (RP) is a group of inherited retinal diseases.
- The genetic basis of RP is complex, involving numerous genes and inheritance patterns.
Purpose of the Study:
- To review recent advances in the molecular genetics of retinitis pigmentosa.
- To highlight the development of genetic markers for RP diagnosis and prognosis.
Main Methods:
- Literature search of MEDLINE (1988-2005) using keywords: 'retinitis pigmentosa', 'rhodopsin', 'RP1', 'RPGR', 'genetic counseling'.
- Review of genes RHO and RP1 associated with RP in the Chinese population.
Main Results:
- RP genetics is complex, with nearly 40 loci and 32 identified candidate genes.
- No single mutation explains over 10% of RP cases, necessitating broad genetic screening.
- High-throughput screening technologies are making comprehensive genetic testing feasible.
Conclusions:
- Advances in RP genetics enable clinically valuable genetic tests.
- Complex inheritance patterns continue to pose challenges for genetic counseling, even with positive genetic screening.