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CHM/REP1 Transcript Expression and Loss of Visual Function in Patients Affected by Choroideremia
Valentina Di Iorio1, Gabriella Esposito2,3, Francesca De Falco2,3
1Eye Clinic, Multidisciplinary Department of Medical, Surgical and Dental Sciences, University of Campania Luigi Vanvitelli, Naples, Italy.
Choroideremia patients experience slow vision loss, worsening after age 50. CHM/REP1 gene mutations impact disease progression and phenotype, highlighting the need for genotype-phenotype correlation studies.
Area of Science:
- Ophthalmology
- Genetics
- Medical Research
Background:
- Choroideremia is an X-linked genetic disorder causing progressive vision loss.
- Understanding disease progression and genotype-phenotype correlations is crucial for patient management.
Purpose of the Study:
- To evaluate long-term disease progression in choroideremia patients.
- To investigate the relationship between CHM/REP1 gene variants and disease phenotypes.
Main Methods:
- Retrospective longitudinal study of 51 male patients.
- Analysis of ocular findings (visual acuity, visual field, OCT, microperimetry) and genetic data (DNA, mRNA).
Main Results:
- Significant worsening of best-corrected visual acuity and Goldmann visual field area over time, accelerating after age 40-50.
- Decreased macular sensitivity and thickness observed.
- Absence of CHM/REP1 gene transcript expression correlated with earlier vision loss.
Conclusions:
- Choroideremia exhibits slow progression, especially in early decades.
- Genotype-phenotype correlation, particularly based on CHM/REP1 transcript expression, warrants further investigation.
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