Abstract
Glucose-6-phosphate dehydrogenase (G6PD) deficiency is a common X-linked disorder with well-established clinical and allelic heterogeneity and ethnic disparity. With ~390,000 annual births with G6PD deficiency in India, it emerges as the most predictable and preventable inborn metabolic error. Disease prevalence and mutation spectrum have been reasonably reported from central, western and southern parts of India and are mostly retrospective studies. Although prevalence data from north India is available, there is paucity of data on the mutation spectrum and genotype–phenotype correlation (G×P). Thus, we aimed at establishing the clinical and mutation profiles for G6PD, as a part of a large prospective newborn screening study conducted between 2014 and 2016 across hospitals in Delhi, India. G6PD activity levels were measured at 24–48 h of life for ~200,000 neonates using Victor 2D and/or Genomic Screening Processor followed by confirmatory spectrophotometric analysis using RBC lysates of the respective neonates based on clinical symptoms. A subset of 570 enzyme deficient neonates were screened for mutations by polymerase chain reaction-restriction fragment length polymorphism and/or Sanger sequencing. Mediterranean was the most common mutation (n=318; 55.8%) with the lowest enzyme activity and most severe phenotype, followed by G6PD Orissa (n=187;32.8%); Kerala-Kalyan (n=25); Jammu (n=24); Mahidol (n=14); Chattam (n=1) and Nilgiri/Coimbra (n=1). Of the 163 intramural neonates followed up, 68 developed clinical jaundice. However, no correlation was observed between jaundice and enzyme level. Notable outcome of this first ever prospective screening approach for G6PD deficiency in neonates may help in prediction of disease severity and appropriate timely management.
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Acknowledgements
Gratefully acknowledge Grant (# IR/SO/LC-0001/2012) to BKT and SK from Science and Engineering Research Board (SERB), New Delhi, India and all the members of SERB-NBS initiative group listed in Annexure; Sanger sequencing and computational facility provided by Central Instrumentation Facility, University of Delhi South Campus (UDSC); infrastructure support provided by the University Grants Commission (UGC), New Delhi, through Special Assistance Programme and Department of Science and Technology, New Delhi, through FIST and DU-DST PURSE (Phase II) programmes to the Department of Genetics, UDSC; Non-NET Fellowship from UGC; and Senior Research Fellowship from Indian Council of Medical Research, New Delhi to UB.
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BKT and SK designed the study and obtained research funding. All clinical collaborators of the SERB-NBS initiative group recruited the neonates; SKP performed confirmatory screening and PD, the clinical follow up of the deficient cohort; UB, DS, MK performed all mutation analysis; UB, PD, SK and BKT wrote the first draft of the manuscript; and all authors contributed and have approved the final manuscript.
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Corresponding editor: Ashwin Dalal
List of SERB-NBS Initiative Group Members is provided in the Appendix.
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Appendix
SERB-NBS Initiative Group Members, Delhi: Madhulika Kabra1, Neerja Gupta1, Ramesh Agarwal1, A. K. Deorari1, V. K. Paul1, Shevendru Roy2, R. K. Sanjeev2, R. S. Tomar2, J. S. Bhasin3, Amit Tyagi3, V. K. Sharma4, Anil Gulati4, Rajesh Yadav5, M. M. A. Faridi6, Prerna Batra6, Pooja Dewan6, Veena Devgan7, Alka Mathur7, Aseem Bhatnagar8, Sunita Bhatia9, Ajay Kumar1,10, Sushma Nangia10, Arvind Saili10, Anju Seth10, Deepak Singla11, S. K. Arora12, S. Mehndiratta12, Ashish Jain13, Gaurav Pradhan13, Sangeeta Gupta13, Siddarth Ramji13, Mukesh Darshan13, S. K. Polipalli13, Somesh Kumar13, Biju Varughese13, Avinash Lomash13, Poonam Sidana14, Sonia Mittal,14, Amarjeet Chitkara14, Arti Maria15, Harish Chellani16, K. C. Aggarwal,16, Shobhna Gupta16, Arya Sugandha16, Ajay Gambhir17, Surinder Bisht18, Anand Aggarwal19, P. M. Kohli19, Indermeet Singh19.
Affiliations: 1All India Institute of Medical Sciences, Delhi, India; 2Army and Base Hospital, Delhi, India; 3BLKapoor Hospital, Delhi, India; 4Deen Dayal Hospital, Delhi, India; 5Girdhari Lal Hospital, Delhi, India; 6Guru Teg Bahadur Hospital, Delhi, India; 7Hindu Rao Hospital, Delhi, India; 8Institute of Nuclear Medicine and Allied Sciences, Delhi, India; 9Kasturba Hospital, Delhi, India; 10Lady Hardinge Medical College, Delhi, India; 11Maharaja Agrasen Hospital, Delhi, India; 12Mata Chanan Devi Hospital, Delhi, India; 13Maulana Azad Medical College, Delhi, India; 14Max Super Speciality Hospital, Delhi, India; 15Ram Manohar Lohia Hospital, Delhi, India; 16Safdurjung Hospital and VMM College, Delhi, India; 17Saroj Hospital, Delhi, India; 18Swami Dayanand Hospital, Delhi, India; 19Sanjay Gandhi Hospital, Delhi, India.
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Bhattacharyya, U., Deswal, P., Polipalli, S.K. et al. Mutation spectrum and enzyme profiling of G6PD deficiency in neonates of north India: a prospective study. J Genet 102, 40 (2023). https://doi.org/10.1007/s12041-023-01437-7
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DOI: https://doi.org/10.1007/s12041-023-01437-7