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Srikrupa N, Srilekha S, Sen P, Arokiasamy T, Meenakshi S, Bhende M, Kapur S, Soumittra N. Genetic profile and mutation spectrum of Leber congenital amaurosis in a larger Indian cohort using high throughput targeted re-sequencing. Clin Genet 2018; 93:329-339. [DOI: 10.1111/cge.13159] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Revised: 09/22/2017] [Accepted: 10/16/2017] [Indexed: 01/02/2023]
Affiliation(s)
- N.N. Srikrupa
- SNONGC Department of Genetics and Molecular Biology; Vision Research Foundation; Chennai India
- PhD Scholar; Birla Institute of Technology & Science (BITS); Hyderabad India
| | - S. Srilekha
- SNONGC Department of Genetics and Molecular Biology; Vision Research Foundation; Chennai India
| | - P. Sen
- Department of Vitreo-Retinal Services; Medical Research Foundation; Chennai India
| | - T. Arokiasamy
- SNONGC Department of Genetics and Molecular Biology; Vision Research Foundation; Chennai India
| | - S. Meenakshi
- Department of Pediatric Ophthalmology; Medical Research Foundation; Chennai India
| | - M. Bhende
- Department of Vitreo-Retinal Services; Medical Research Foundation; Chennai India
| | - S. Kapur
- Department of Biological Sciences; Birla Institute of Technology & Science (BITS); Hyderabad India
| | - N. Soumittra
- SNONGC Department of Genetics and Molecular Biology; Vision Research Foundation; Chennai India
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Neuillé M, Malaichamy S, Vadalà M, Michiels C, Condroyer C, Sachidanandam R, Srilekha S, Arokiasamy T, Letexier M, Démontant V, Sahel JA, Sen P, Audo I, Soumittra N, Zeitz C. Next-generation sequencing confirms the implication of SLC24A1 in autosomal-recessive congenital stationary night blindness. Clin Genet 2016; 89:690-9. [PMID: 26822852 DOI: 10.1111/cge.12746] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2015] [Revised: 01/25/2016] [Accepted: 01/25/2016] [Indexed: 01/17/2023]
Abstract
Congenital stationary night blindness (CSNB) is a clinically and genetically heterogeneous retinal disorder which represents rod photoreceptor dysfunction or signal transmission defect from photoreceptors to adjacent bipolar cells. Patients displaying photoreceptor dysfunction show a Riggs-electroretinogram (ERG) while patients with a signal transmission defect show a Schubert-Bornschein ERG. The latter group is subdivided into complete or incomplete (ic) CSNB. Only few CSNB cases with Riggs-ERG and only one family with a disease-causing variant in SLC24A1 have been reported. Whole-exome sequencing (WES) in a previously diagnosed icCSNB patient identified a homozygous nonsense variant in SLC24A1. Indeed, re-investigation of the clinical data corrected the diagnosis to Riggs-form of CSNB. Targeted next-generation sequencing (NGS) identified compound heterozygous deletions and a homozygous missense variant in SLC24A1 in two other patients, respectively. ERG abnormalities varied in these three cases but all patients had normal visual acuity, no myopia or nystagmus, unlike in Schubert-Bornschein-type of CSNB. This confirms that SLC24A1 defects lead to CSNB and outlines phenotype/genotype correlations in CSNB subtypes. In case of unclear clinical characteristics, NGS techniques are helpful to clarify the diagnosis.
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Affiliation(s)
- M Neuillé
- Sorbonne Universités, UPMC Univ Paris 06, INSERM, CNRS, Institut de la Vision, Paris, France
| | - S Malaichamy
- SN ONGC Department of Genetics and Molecular Biology, Vision Research Foundation, Chennai, India
| | - M Vadalà
- Ophthalmology Section, Department of Experimental Medicine and Clinical Neuroscience, University of Palermo, Palermo, Italy
| | - C Michiels
- Sorbonne Universités, UPMC Univ Paris 06, INSERM, CNRS, Institut de la Vision, Paris, France
| | - C Condroyer
- Sorbonne Universités, UPMC Univ Paris 06, INSERM, CNRS, Institut de la Vision, Paris, France
| | - R Sachidanandam
- Department of Optometry, Medical Research Foundation, Chennai, India
| | - S Srilekha
- SN ONGC Department of Genetics and Molecular Biology, Vision Research Foundation, Chennai, India
| | - T Arokiasamy
- SN ONGC Department of Genetics and Molecular Biology, Vision Research Foundation, Chennai, India
| | | | - V Démontant
- Sorbonne Universités, UPMC Univ Paris 06, INSERM, CNRS, Institut de la Vision, Paris, France
| | - J-A Sahel
- Sorbonne Universités, UPMC Univ Paris 06, INSERM, CNRS, Institut de la Vision, Paris, France.,CHNO des Quinze-Vingts, DHU Sight Restore, INSERM-DHOS CIC 1423, Paris, France.,Institute of Ophthalmology, University College of London, London, UK.,Fondation Ophtalmologique Adolphe de Rothschild, Paris, France.,Académie des Sciences, Institut de France, Paris, France
| | - P Sen
- Department of Vitreo-Retinal Services, Medical Research Foundation, Chennai, India
| | - I Audo
- Sorbonne Universités, UPMC Univ Paris 06, INSERM, CNRS, Institut de la Vision, Paris, France.,CHNO des Quinze-Vingts, DHU Sight Restore, INSERM-DHOS CIC 1423, Paris, France.,Institute of Ophthalmology, University College of London, London, UK
| | - N Soumittra
- SN ONGC Department of Genetics and Molecular Biology, Vision Research Foundation, Chennai, India
| | - C Zeitz
- Sorbonne Universités, UPMC Univ Paris 06, INSERM, CNRS, Institut de la Vision, Paris, France
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Kumaramanickavel G, Joseph B, Vidhya A, Arokiasamy T, Shridhara Shetty N. Consanguinity and Ocular Genetic Diseases in South India: Analysis of a Five-Year Study. ACTA ACUST UNITED AC 2002; 5:182-5. [PMID: 14960889 DOI: 10.1159/000066334] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
OBJECTIVE Consanguineous marriage is a widely practised social custom in Asia and northern Africa. In south India, Dravidian Hindus have contracted consanguineous marriages for over 2,000 years. In the present study, the influence of consanguinity on the prevalence of visual disorders was examined in patients attending a specialist genetic eye clinic. SUBJECTS AND METHODS A total of 2,335 patients attending Sankara Nethralaya, Chennai, India, were screened for genetic eye disorders over a five-year period. The patients were drawn from all parts of India and from neighbouring countries in south Asia. RESULTS AND DISCUSSION Six hundred and seventy-three (28.8%) of the patients tested for ophthalmic genetic disorders reported a family history of consanguinity. The majority (n = 574) of these families were from south India. In the patient group as a whole, the most common form of consanguineous union was between first cousins (n = 367), followed by uncle/niece marriage (n = 177), equivalent to a mean coefficient of inbreeding alpha = 0.0202. Among the consanguineous families, 430 of 673 (63.9%) had retinitis pigmentosa, 167 of these cases were autosomal recessive and 199 were isolated cases. The public in regions such as south India should be made aware of the merits and demerits of consanguineous marriages.
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Affiliation(s)
- G Kumaramanickavel
- Department of Genetics and Molecular Biology, Medical and Vision Research Foundations, Sankara Nethralaya, Chennai, India.
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Kumaramanickavel G, Sripriya S, Vellanki RN, Upadyay NK, Badrinath SS, Arokiasamy T, Sukumar B, Vidhya A, Joseph B, Sharma T, Gopal L. Tumor necrosis factor allelic polymorphism with diabetic retinopathy in India. Diabetes Res Clin Pract 2001; 54:89-94. [PMID: 11640992 DOI: 10.1016/s0168-8227(01)00269-8] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The association of tumor necrosis factor (TNF) with diabetic retinopathy (DR) has been described previously. A total of 207 Asian Indian patients of 15-year duration of type 2 diabetes were identified. This group included (i) 100 patients with DR and (ii) 107 patients without retinopathy (DNR). In this study, we correlated the length of the (GT)n microsatellite di-nucleotide repeat upstream to the promoter region of TNF gene with susceptibility for the development of retinopathy. The microsatellite was polymerase chain reaction amplified and electrophoresed on polyacrylamide gel and silver stained. In our study population, there were 18 alleles ranging from 97 to 131 base pairs (bp). Allele 4 (103 bp) had a higher prevalence (9.81%) in the DNR group compared to that (2.5%) in the DR group (P=0.002). Patients with retinopathy and allele 8 (111 bp) had a tendency to develop proliferative diabetic retinopathy (PDR). In this study of Indian subjects, it is suggested that allele 4 is a low risk allele for developing retinopathy and allele 8 (111 bp) shows an association with PDR.
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Affiliation(s)
- G Kumaramanickavel
- Department of Genetics & Molecular Biology, Medical & Vision Research Foundations, Sankara Nethralaya, 18, College Road, 600 006, Chennai, India.
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