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Song Y, Chen C, Xie Y, Sun T, Xu K, Li Y. Clinical and genetic findings in a Chinese cohort with choroideremia. Eye (Lond) 2023; 37:459-466. [PMID: 35132212 PMCID: PMC9905080 DOI: 10.1038/s41433-022-01950-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Revised: 01/06/2022] [Accepted: 01/18/2022] [Indexed: 11/09/2022] Open
Abstract
OBJECTIVE Choroideremia (CHM) is an X-linked chorioretinal dystrophy caused by variants in the CHM gene. The aim of this study was to report the clinical and genetic features of a cohort of affected males with CHM and establish the relationship between best correct visual acuity (BCVA) and age. METHOD Twenty-seven patients from 24 unrelated families underwent detailed ophthalmic examinations and comprehensive molecular genetic analysis. We combined the 27 patients in our own cohort with 68 Chinese patients from six previously reported studies to determine a transition age for BCVA rapid decline in 95 patients. RESULTS Twenty-three causal (9 novel) CHM variants were identified in the 27 patients, who had a mean age of 30.5 ± 17.4 years and a mean BCVA (LogMAR) of 0.61 ± 0.79. Patients at different disease stages showed different extents of retinal pigment epithelium (RPE) and choroid abnormalities. Central retinal optical coherence tomography (OCT) scanning revealed defects in the ellipsoid zone and RPE in all patients and outer retinal tubulations in 75%. The 95 patients had a mean age of 33.27 ± 16.27 years and an average (LogMAR) of 0.72 ± 0.82. The BCVA did not decline rapidly before age 25, but decreased at a mean rate of 0.037logMAR/year after that age. CONCLUSIONS Our results indicated Chinese patients with CHM variants have a younger transition age for rapid BCVA decline than previously reported for other ethnic groups. Central retinal OCT scanning can identify different abnormalities in the retinal structures, and these might be used as other parameters for monitoring disease progression in patients with CHM.
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Affiliation(s)
- Yuning Song
- Beijing Institute of Ophthalmology, Beijing Tongren Eye Center, Beijing Tongren Hospital, Beijing Ophthalmology & Visual Sciences Key Lab, Capital Medical University, Beijing, China
| | - Chunjie Chen
- Beijing Institute of Ophthalmology, Beijing Tongren Eye Center, Beijing Tongren Hospital, Beijing Ophthalmology & Visual Sciences Key Lab, Capital Medical University, Beijing, China
| | - Yue Xie
- Beijing Institute of Ophthalmology, Beijing Tongren Eye Center, Beijing Tongren Hospital, Beijing Ophthalmology & Visual Sciences Key Lab, Capital Medical University, Beijing, China
| | - Tengyang Sun
- Beijing Institute of Ophthalmology, Beijing Tongren Eye Center, Beijing Tongren Hospital, Beijing Ophthalmology & Visual Sciences Key Lab, Capital Medical University, Beijing, China
| | - Ke Xu
- Beijing Institute of Ophthalmology, Beijing Tongren Eye Center, Beijing Tongren Hospital, Beijing Ophthalmology & Visual Sciences Key Lab, Capital Medical University, Beijing, China
| | - Yang Li
- Beijing Institute of Ophthalmology, Beijing Tongren Eye Center, Beijing Tongren Hospital, Beijing Ophthalmology & Visual Sciences Key Lab, Capital Medical University, Beijing, China.
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Sahin B, Burton E, Kuybu O, Sahin Y, Brinkley J. The genetic counseling in a patient affected by choroideremia solved with the whole-exome sequencing approach. Indian J Ophthalmol 2022; 70:2693-2694. [PMID: 35791209 PMCID: PMC9426147 DOI: 10.4103/ijo.ijo_64_22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Affiliation(s)
- Bedia Sahin
- Department of Ophthalmology, Karaman State Hospital, Karaman, Turkey
| | - Erik Burton
- Department of Neurology, LSU Health Shreveport, Shreveport, LA, USA
| | - Okkes Kuybu
- Department of Neurology, LSU Health Shreveport, Shreveport, LA, USA
| | - Yavuz Sahin
- Genoks Genetic Diseases Diagnostic Center, Ankara, Turkey
| | - John Brinkley
- Department of Ophthalmology, LSU Health Shreveport, Shreveport, LA, USA
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Tang H, Mao J, Xiang J, Liu M, Li H, Wang T. Whole-exome sequencing identified a novel mutation in CHM of a Chinese family. J Genet 2021. [DOI: 10.1007/s12041-021-01282-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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McLaren TL, De Roach JN, Thompson JA, Chen FK, Mackey DA, Hoffmann L, Urwin IR, Lamey TM. Expanding the genetic spectrum of choroideremia in an Australian cohort: report of five novel CHM variants. Hum Genome Var 2020; 7:35. [PMID: 33110609 PMCID: PMC7584600 DOI: 10.1038/s41439-020-00122-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Revised: 08/04/2020] [Accepted: 09/11/2020] [Indexed: 12/23/2022] Open
Abstract
Choroideremia is an X-linked chorioretinal dystrophy caused by mutations in the CHM gene. Several CHM gene replacement clinical trials are in advanced stages. In this study, we report the molecular confirmation of choroideremia in 14 Australian families sourced from the Australian Inherited Retinal Disease Registry and DNA Bank. Sixteen males (14 symptomatic) and 18 females (4 symptomatic; 14 obligate carriers) were identified for analysis. Participants' DNA was analyzed for disease-causing CHM variants by Sanger sequencing, TaqMan qPCR and targeted NGS. We report phenotypic and genotypic data for the 14 symptomatic males and four females manifesting disease symptoms. A pathogenic or likely pathogenic CHM variant was detected in all families. Eight variants were previously reported, and five were novel. Two de novo variants were identified. We previously reported the molecular confirmation of choroideremia in 11 Australian families. This study expands the CHM genetically confirmed Australian cohort to 32 males and four affected carrier females.
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Affiliation(s)
- Terri L. McLaren
- Australian Inherited Retinal Disease Registry and DNA Bank, Department of Medical Technology and Physics, Sir Charles Gairdner Hospital, Hospital Avenue, Nedlands, Western Australia Australia
- Centre for Ophthalmology and Visual Science, The University of Western Australia, 35 Stirling Highway, Crawley, Perth, Western Australia Australia
| | - John N. De Roach
- Australian Inherited Retinal Disease Registry and DNA Bank, Department of Medical Technology and Physics, Sir Charles Gairdner Hospital, Hospital Avenue, Nedlands, Western Australia Australia
- Centre for Ophthalmology and Visual Science, The University of Western Australia, 35 Stirling Highway, Crawley, Perth, Western Australia Australia
| | - Jennifer A. Thompson
- Australian Inherited Retinal Disease Registry and DNA Bank, Department of Medical Technology and Physics, Sir Charles Gairdner Hospital, Hospital Avenue, Nedlands, Western Australia Australia
| | - Fred K. Chen
- Australian Inherited Retinal Disease Registry and DNA Bank, Department of Medical Technology and Physics, Sir Charles Gairdner Hospital, Hospital Avenue, Nedlands, Western Australia Australia
- Centre for Ophthalmology and Visual Science, The University of Western Australia, 35 Stirling Highway, Crawley, Perth, Western Australia Australia
- Lions Eye Institute, 2 Verdun Street, Nedlands, Western Australia Australia
- Department of Ophthalmology, Royal Perth Hospital, Victoria Square, Perth, Western Australia Australia
- Department of Ophthalmology, Perth Children’s Hospital, Hospital Avenue, Nedlands, Western Australia Australia
| | - David A. Mackey
- Australian Inherited Retinal Disease Registry and DNA Bank, Department of Medical Technology and Physics, Sir Charles Gairdner Hospital, Hospital Avenue, Nedlands, Western Australia Australia
- Centre for Ophthalmology and Visual Science, The University of Western Australia, 35 Stirling Highway, Crawley, Perth, Western Australia Australia
- Lions Eye Institute, 2 Verdun Street, Nedlands, Western Australia Australia
| | - Ling Hoffmann
- Australian Inherited Retinal Disease Registry and DNA Bank, Department of Medical Technology and Physics, Sir Charles Gairdner Hospital, Hospital Avenue, Nedlands, Western Australia Australia
| | - Isabella R. Urwin
- Australian Inherited Retinal Disease Registry and DNA Bank, Department of Medical Technology and Physics, Sir Charles Gairdner Hospital, Hospital Avenue, Nedlands, Western Australia Australia
| | - Tina M. Lamey
- Australian Inherited Retinal Disease Registry and DNA Bank, Department of Medical Technology and Physics, Sir Charles Gairdner Hospital, Hospital Avenue, Nedlands, Western Australia Australia
- Centre for Ophthalmology and Visual Science, The University of Western Australia, 35 Stirling Highway, Crawley, Perth, Western Australia Australia
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da Palma MM, Motta FL, Gomes CP, Salles MV, Pesquero JB, Sallum JMF. Synonymous Variant in the CHM Gene Causes Aberrant Splicing in Choroideremia. Invest Ophthalmol Vis Sci 2020; 61:38. [PMID: 32097478 PMCID: PMC7329626 DOI: 10.1167/iovs.61.2.38] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Purpose Choroideremia is an inherited retinal degeneration caused by 280 different pathogenic variants in the CHM gene. Only one silent/synonymous variant (c.1359C>T; p.(Ser453=)) has been reported and was classified as inconclusive based on in silico analysis. This study elucidates the pathogenicity of this variant also found in a Brazilian patient. Methods Ophthalmological examinations such as color fundus photography, spectral-domain optical coherence tomography, fundus autofluorescence, and macular integrity assessment microperimetry were performed. The subjects' total RNA was extracted from peripheral blood cells. cDNA was synthesized and the amplification between exon 10 and 14 of the CHM mRNA was performed. The amplification products were sequenced by Sanger sequencing and the results were aligned to the reference sequence. Results The synonymous variant c.1359C>T p.(Ser453=) in the CHM gene is associated with an error in mRNA processing, leading preferentially to production of an aberrant transcript without exon 11 (p.(Gln451Phefs*3)). This anomalous mRNA production is related to typical choroideremia phenotype. Conclusions These molecular findings reinforce the need for more detailed investigation of silent variants in patients with well-defined phenotype of retinal dystrophies. Molecular and clinical findings provided evidence that c.1359C>T (p.(Gln451Phefs*3)) in CHM should be considered a disease-causing variant.
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CLINICAL CHARACTERISTICS AND MOLECULAR GENETIC ANALYSIS OF A COHORT OF CHINESE PATIENTS WITH CHOROIDEREMIA. Retina 2020; 40:2240-2253. [PMID: 31922496 DOI: 10.1097/iae.0000000000002743] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
PURPOSE To describe the clinical and molecular genetic characteristics of a large cohort of Chinese patients with choroideremia (CHM). METHODS Forty-eight Chinese participants from 35 families with a clinical diagnosis of CHM who harbored sequence variants in the CHM gene were enrolled. Comprehensive clinical evaluations and molecular genetic analysis of the CHM gene were performed. RESULTS The median age of the 48 patients was 31.5 years (range, 5-78 years). There were 30 different sequence variants detected in 35 families; of which, 13 sequence variants were novel. The mean (±SD) best-corrected visual acuity best in logarithm of the minimum angle of resolution equivalents was 0.71 (±0.87) (range, 0.00-2.80) or approximately 20/100 in Snellen visual acuity. A significant correlation was revealed between best-corrected visual acuity best and age (P < 0.001). The trend in the change in the best-corrected visual acuity over age showed that relatively good vision remained until 20 years old. The patterns of fundus photography and fundus autofluorescence finding demonstrated that residual retinal pigment epithelium areas significantly declined in patients at the age of 20 years or older. The results of visual field and full-field electroretinography showed that these measures might be of limited value for evaluating the condition of the late stage of CHM in Chinese patients. CONCLUSION This study described for the first time the clinical and molecular genetic characteristics of a large cohort of Chinese patients with CHM. The findings from best-corrected visual acuity best and visual field showed that the impairment of visual function in CHM might be more severe in Chinese patients than in western patients.
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Novel CHM mutations in Polish patients with choroideremia - an orphan disease with close perspective of treatment. Orphanet J Rare Dis 2018; 13:221. [PMID: 30541579 PMCID: PMC6291982 DOI: 10.1186/s13023-018-0965-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Accepted: 11/27/2018] [Indexed: 11/27/2022] Open
Abstract
Background Choroideremia (CHM) is a rare X-linked recessive retinal dystrophy characterized by progressive chorioretinal degeneration in the males affected. The symptoms include night blindness in childhood, progressive peripheral vision loss and total blindness in the late stages. The disease is caused by mutations in the CHM gene encoding Rab Escort Protein 1 (REP-1). The aim of the study was to identify the molecular basis of choroideremia in five families of Polish origin. Methods Six male patients from five unrelated families of Polish ethnicity, who were clinically diagnosed with choroideremia, were examined in this study. An ophthalmologic examination performed in all the probands included: best-corrected visual acuity, slit-lamp examination, funduscopy, fluorescein angiography and perimetry. The entire coding region encompassing 15 exons and the flanking intronic sequences of the CHM gene were amplified with PCR and directly sequenced in all the patients. Results Five variants in the CHM gene were identified in the five families examined. Two of the variants were new: c.1175dupT and c.83C > G, while three had been previously reported. Conclusions This study provides the first molecular genetic characteristics of patients with choroideremia from the previously unexplored Polish population.
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Li HH, Shan L, Wang B, DU L, Jia FY. [Warburg-Micro syndrome caused by 1q43-q44 deletion: genotypic and phenotypic analysis in a child]. ZHONGGUO DANG DAI ER KE ZA ZHI = CHINESE JOURNAL OF CONTEMPORARY PEDIATRICS 2018; 20:585-587. [PMID: 30022763 PMCID: PMC7389199 DOI: 10.7499/j.issn.1008-8830.2018.07.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Accepted: 05/28/2018] [Indexed: 06/08/2023]
Affiliation(s)
- Hong-Hua Li
- Department of Developmental and Behavioral Pediatrics, First Hospital, Jilin University, Changchun 130021, China
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Imani S, Ijaz I, Shasaltaneh MD, Fu S, Cheng J, Fu J. Molecular genetics characterization and homology modeling of the CHM gene mutation: A study on its association with choroideremia. MUTATION RESEARCH-REVIEWS IN MUTATION RESEARCH 2018; 775:39-50. [DOI: 10.1016/j.mrrev.2018.02.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Revised: 01/21/2018] [Accepted: 02/13/2018] [Indexed: 12/19/2022]
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Yang L, Ijaz I, Cheng J, Wei C, Tan X, Khan MA, Fu X, Fu J. Evaluation of amplification refractory mutation system (ARMS) technique for quick and accurate prenatal gene diagnosis of CHM variant in choroideremia. APPLICATION OF CLINICAL GENETICS 2017; 11:1-8. [PMID: 29296092 PMCID: PMC5741072 DOI: 10.2147/tacg.s144383] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Choroideremia is a rare X-linked recessive inherited disorder that causes chorioretinal dystrophy leading to visual impairment in its early stages which finally causes total blindness in the affected person. It is caused due to mutations in the CHM gene. In this study, we have recruited a pedigree with choroideremia and detected a nonsense variant (c.C799T:p.R267X) in CHM of the proband (I:1). Different primer sets for amplification refractory mutation system (ARMS) were designed and PCR conditions were optimized. Then, we evaluated the sequence variant in the patient, carrier, and a fetus by using ARMS technique to identify if they inherited the pathogenic gene from parental generation; we used amniotic fluid DNA for the diagnosis of the gene in the fetus. The primer pairs, WT2+C and MT+C, amplified high specific products in different DNAs which were verified by Sanger sequencing. Based on our results, ARMS technique is fast, accurate, and reliable prenatal gene diagnostic tool to assess CHM variants. Taken together, our study indicates that ARMS technique can be used as a potential molecular tool in the diagnosis of prenatal mutation for choroideremia as well as other genetic diseases in undeveloped and developing countries, where there might be shortage of medical resources and supplies.
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Affiliation(s)
- Lisha Yang
- Key Laboratory of Epigenetics and Oncology, the Research Center for Precision Medicine, Southwest Medical University, Luzhou
| | - Iqra Ijaz
- Key Laboratory of Epigenetics and Oncology, the Research Center for Precision Medicine, Southwest Medical University, Luzhou
| | - Jingliang Cheng
- Key Laboratory of Epigenetics and Oncology, the Research Center for Precision Medicine, Southwest Medical University, Luzhou.,Department of Pathology, Hunan Normal University College of Medicine, Changsha
| | - Chunli Wei
- Key Laboratory of Epigenetics and Oncology, the Research Center for Precision Medicine, Southwest Medical University, Luzhou.,State Key Laboratory of Quality Research in Chinese Medicine, Macau University of Science and Technology, Macau (SAR)
| | - Xiaojun Tan
- Reproductive and Genetic Center, the Central Hospital of Xiangtan City, Xiangtan
| | - Md Asaduzzaman Khan
- Key Laboratory of Epigenetics and Oncology, the Research Center for Precision Medicine, Southwest Medical University, Luzhou
| | - Xiaodong Fu
- Department of Obstetrics and Gynecology, First Affiliated Hospital of Southwest Medical University, Luzhou, People's Republic of China
| | - Junjiang Fu
- Key Laboratory of Epigenetics and Oncology, the Research Center for Precision Medicine, Southwest Medical University, Luzhou.,Department of Pathology, Hunan Normal University College of Medicine, Changsha.,State Key Laboratory of Quality Research in Chinese Medicine, Macau University of Science and Technology, Macau (SAR)
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Huang XF, Huang ZQ, Fang XL, Chen ZJ, Cheng W, Jin ZB. Retinal miRNAs variations in a large cohort of inherited retinal disease. Ophthalmic Genet 2017; 39:175-179. [PMID: 28704127 DOI: 10.1080/13816810.2017.1329448] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
BACKGROUND Although great efforts have been paid on identification of genetic predisposition in the inherited retinal disease (IRD), genetic causes of a large proportion of patients remain a mystery. This dilemma makes us attempt to speculate that genetic components other than coding genes might be an additional pool predisposing IRD. In this study, we aim to perform a mutational screening in a large cohort of IRD patients with a particular focus on retina-specific or abundant microRNAs (miRs). MATERIAL AND METHODS A total of 324 unrelated patients with IRD were recruited. Targeted next-generation sequencing (tNGS) was performed to survey genetic mutations in 32 known miRs highly expressed in the retina, followed by validation with Sanger sequencing, co-segregation analysis in each family, and computational assessments. RESULTS Novel genotype-phenotype associations have been uncovered. In total, six different variants in the miRs were identified, including four rare ones, miR-216a (n.56C>A), miR-216b (n.43_44insG), miR-7-2 (n.107C>T), and miR-7-3 (n.95G>A). The other two variants, miR-182 (n.106G>A) and miR-216a (n.105T>A), were considered as polymorphic. CONCLUSIONS We for the first time screened candidate retinal miRs in patients with IRD. Although there is no convincing evidence that these variants are responsible for the IRD, the results enhance the current knowledge of the associations between IRD and miRNAs variants.
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Affiliation(s)
- Xiu-Feng Huang
- a Division of Ophthalmic Genetics , Lab for Stem Cell & Retinal Regeneration, Institute of Stem Cell Research, The Eye Hospital, Wenzhou Medical University , Wenzhou , China
| | - Zhi-Qin Huang
- a Division of Ophthalmic Genetics , Lab for Stem Cell & Retinal Regeneration, Institute of Stem Cell Research, The Eye Hospital, Wenzhou Medical University , Wenzhou , China
| | - Xiao-Long Fang
- a Division of Ophthalmic Genetics , Lab for Stem Cell & Retinal Regeneration, Institute of Stem Cell Research, The Eye Hospital, Wenzhou Medical University , Wenzhou , China
| | - Zhen-Ji Chen
- a Division of Ophthalmic Genetics , Lab for Stem Cell & Retinal Regeneration, Institute of Stem Cell Research, The Eye Hospital, Wenzhou Medical University , Wenzhou , China
| | - Wan Cheng
- a Division of Ophthalmic Genetics , Lab for Stem Cell & Retinal Regeneration, Institute of Stem Cell Research, The Eye Hospital, Wenzhou Medical University , Wenzhou , China
| | - Zi-Bing Jin
- a Division of Ophthalmic Genetics , Lab for Stem Cell & Retinal Regeneration, Institute of Stem Cell Research, The Eye Hospital, Wenzhou Medical University , Wenzhou , China
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