Retinitis pigmentosa genetics: a study in Indian population

Area of Science:

• Ophthalmology
• Genetics
• Medical Research

Background:

• Retinitis pigmentosa (RP) is a group of inherited retinal diseases.
• Understanding the genetic basis of RP is crucial for diagnosis and treatment.
• Previous studies have indicated varied genetic patterns in different populations.

Purpose of the Study:

• To investigate the frequencies of different genetic categories in Indian RP patients.
• To identify the predominant inheritance pattern and associated factors in this cohort.
• To explore the relationship between consanguinity and disease characteristics in autosomal recessive RP.

Main Methods:

• Screening of 151 retinitis pigmentosa patients from 83 families.
• Analysis of inheritance patterns, categorizing cases into autosomal recessive, isolated/sporadic, and others.
• Detailed study of autosomal recessive cases, focusing on consanguinity and clinical presentation.

Main Results:

• A significant proportion (110/151) of patients exhibited a positive inheritance pattern.
• Autosomal recessive (AR) inheritance was the most frequent genetic pattern (53/151), followed by isolated/sporadic cases (41/151).
• Consanguinity was a major characteristic in the Indian autosomal recessive RP cohort (49/53), associated with early onset and severe disease progression.

Conclusions:

• Autosomal recessive inheritance is the predominant genetic pattern of RP in the studied Indian population.
• Consanguinity significantly contributes to the prevalence and severity of autosomal recessive RP in this region.
• Findings highlight the importance of genetic counseling and screening for consanguineous families affected by RP.