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Nagral A, Mallakmir S, Garg N, Tiwari K, Masih S, Nagral N, Unavane O, Jhaveri A, Phadke S, ArunKumar G, Aggarwal R. Genomic Variations in ATP7B Gene in Indian Patients with Wilson Disease. Indian J Pediatr 2023; 90:240-248. [PMID: 36112267 DOI: 10.1007/s12098-022-04250-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/15/2021] [Revised: 03/13/2022] [Accepted: 04/05/2022] [Indexed: 01/03/2023]
Abstract
OBJECTIVE To report genotype data of the patients with Wilson disease (WD) hailing from across several parts of India to add to the available spectrum of causative variants in ATP7B gene (ATPase copper transporting beta polypeptide gene) and associated phenotypes in the Indian population. METHODS The entire ATP7B gene was sequenced in 58 patients with WD and additional testing was also done by MLPA to look for intragenic deletions duplications and exome sequencing to rule out genetic variations with similar phenotypic overlap. RESULTS Of all patients, 37 patients had a total of 33 distinct pathogenic variations, including 29 in the exonic regions and 4 at intronic splice sites. Of the variations identified, six were novel. The underlying genomic variations could be identified in nearly two-thirds of the patients by sequencing the entire gene. CONCLUSIONS This study reports the genotype-phenotype data to add to the available spectrum of causative variants in ATP7B gene. The inability to detect a pathogenic variation in some patients and the existence of phenotypic variations in individuals with the same variation suggest that additional factors or genes may play a role in causation of the disease. Further, a marked genetic heterogeneity was found in the study patients, indicating ethnic diversity of the Indian population.
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Affiliation(s)
- Aabha Nagral
- Department of Gastroenterology, Apollo Hospitals, Navi Mumbai, Maharashtra, India. .,Department of Gastroenterology, Jaslok Hospital and Research Center, Mumbai, Maharashtra, India. .,, 7, Snehsagar, Prabhanagar, Prabhadevi, Mumbai, Maharashtra, 400025, India.
| | - Snehal Mallakmir
- Department of Pediatrics, Apollo Hospitals, Navi Mumbai, Maharashtra, India
| | - Nikita Garg
- Department of Gastroenterology, Jaslok Hospital and Research Center, Mumbai, Maharashtra, India
| | - Kritika Tiwari
- Department of Pediatrics, Matushree Gomati Hospital, Mumbai, Maharashtra, India
| | - Suzena Masih
- Department of Medical Genetics, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
| | - Nishtha Nagral
- Department of General Medicine, Fortis Hospital, Mulund, Mumbai, Maharashtra, India
| | - Ojas Unavane
- Department of General Medicine, Seth G.S. Medical College and KEM Hospital, Mumbai, Maharashtra, India
| | - Ajay Jhaveri
- Department of Gastroenterology, Jaslok Hospital and Research Center, Mumbai, Maharashtra, India
| | - Shubha Phadke
- Department of Medical Genetics, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
| | | | - Rakesh Aggarwal
- Department of Gastroenterology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India.,Department of Gastroenterology, Jawaharlal Institute of Postgraduate Medical Education and Research, Puducherry, India
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Novel mutations of ATP7B gene in Wilson's disease patients of South Indian cohort. Meta Gene 2017. [DOI: 10.1016/j.mgene.2017.08.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Guggilla SR, Senagari JR, Rao PN, Madireddi S. Spectrum of mutations in the ATP binding domain of ATP7B gene of Wilson Disease in a regional Indian cohort. Gene 2015; 569:83-7. [PMID: 25982861 DOI: 10.1016/j.gene.2015.05.031] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2014] [Revised: 05/01/2015] [Accepted: 05/12/2015] [Indexed: 12/31/2022]
Abstract
Wilson disease is an autosomal recessive disorder of abnormal copper accumulation in the liver, brain, kidney and cornea, resulting in hepatic and neurological abnormalities, which results from impaired ATP7B protein function due to mutations in candidate ATP7B gene, till date more than 500 disease causing mutations were found. In India most disease causing mutations were identified in ATP-BD. DNA samples of the 101 WD cases and 100 control population were analyzed for mutations. 11 mutations were identified in 57 chromosomes. Three novel mutations, c.3310T>A (p.Cys1104Ser), c.3337C>A (p.Leu1113Met) on exon 15 and c.3877G>A (p.Glu1293Lys) on exon 18 were identified for the first time in the ATP7B gene. Two mutations, c.3121C>T (p.Arg1041Trp) and c.3128T>C (p.Leu1043Pro) on exon 14 were discovered for the first time in Indian Wilson disease patients. Four previously reported mutations c.3008C>T, c.3029A>G on exon 13, c.3182G>A on exon 14 and c.3809A>G on exon 18 from South India were also found in this study. Our research has enriched the spectrum of mutations of the ATP7B gene in the south Indian population. The detection of new mutations in the ATP7B gene can aid in genetic counseling and clinical or/prenatal diagnosis.
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Affiliation(s)
- Sreenivasa Rao Guggilla
- Institute of Genetics and Hospital for Genetic Diseases, Osmania University, Hyderabad India
| | | | - P N Rao
- Asian Institute of Gastroenterology Hyderabad, India
| | - Sujatha Madireddi
- Institute of Genetics and Hospital for Genetic Diseases, Osmania University, Hyderabad India.
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