Identification of Pathogenic Variants in the CHM Gene in Two Korean Patients With Choroideremia.
10.3343/alm.2017.37.5.438
- Author:
Kunho BAE
1
;
Ju Sun SONG
;
Chung LEE
;
Nayoung K D KIM
;
Woong Yang PARK
;
Byoung Joon KIM
;
Chang Seok KI
;
Sang Jin KIM
Author Information
1. Department of Ophthalmology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea. sangjinkim@skku.edu
- Publication Type:Case Report
- Keywords:
Choroideremia;
CHM;
Inherited retinal degeneration
- MeSH:
Atrophy;
Blindness;
Choroideremia*;
Clinical Coding;
Diagnosis;
Electroretinography;
Exons;
Genetic Therapy;
Humans;
Introns;
Molecular Biology;
Multimodal Imaging;
Night Blindness;
Visual Fields
- From:Annals of Laboratory Medicine
2017;37(5):438-442
- CountryRepublic of Korea
- Language:English
-
Abstract:
Choroideremia is a rare X-linked disorder causing progressive chorioretinal atrophy. Affected patients develop night blindness with progressive peripheral vision loss and eventual blindness. Herein, we report two Korean families with choroideremia. Multimodal imaging studies showed that the probands had progressive loss of visual field with characteristic chorioretinal atrophy, while electroretinography demonstrated nearly extinguished cone and rod responses compatible with choroideremia. Sanger sequencing of all coding exons and flanking intronic regions of the CHM gene revealed a novel small deletion at a splice site (c.184_189+3delTACCAGGTA) in one patient and a deletion of the entire exon 9 in the other. This is the first report on a molecular genetic diagnosis of choroideremia in Korean individuals. Molecular diagnosis of choroideremia should be widely adopted for proper diagnosis and the development of new treatment modalities including gene therapy.
