Abstract
The aim of the present work was to explore the intriguing association of maternal folate regulator gene polymorphisms and mutations with the incidence of chromosome 21 nondisjunction and Down syndrome birth. We tested polymorphisms/mutations of DNMT3B and RFC1 genes for their association with meiotic errors in oocyte among the 1215 Down syndrome child-bearing women and 900 controls. We observed that 23 out of 31 variants of DNMT3B and RFC1 exhibited an association with meiosis II nondisjunction in maternal age-independent manner. Additionally, we have reported 17 novel mutations and 1 novel polymorphic variant that are unique to the Indian Bengali speaking cohort and increased odds in favour of meiosis II nondisjunction. We hypothesize that the risk variants and mutations of DNMT3B and RFC1 genes may cause reduction in two or more recombination events and also cause peri-centromeric single exchange that increases the risk of nondisjunction at any age of women. In silico analyses predicted the probable damages of the transcripts or proteins from the respective genes owing to the said polymorphisms. These findings from the largest population sample tested ever revealed that mutations/polymorphisms of the genes DNMT3B and RFC1 impair recombination that leads to chromosome 21 nondisjunction in the oocyte at meiosis II stage and bring us a significant step closer towards understanding the aetiology of chromosome 21 nondisjunction and birth of a child with Down syndrome to women at any age.
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Acknowledgements
We are indebted to the participating families and physician friends who helped in procuring tissue samples. The departmental instrumental facilities were supported by University Grants Commission-University with Potential for Excellence II (UGC-UPE II), Department of Science and Technology-Fund for Improvement of S&T Infrastructure (DST-FIST), Department of Science and Technology-Promotion of University Research and Scientific Excellence (DST-PURSE) programme at the University of Calcutta.
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This work was supported by the grant from the Department of Science and Technology, Government of West Bengal (WB-DST), India (Grant number SG/WBDST/S&T 1000114/2016) and University of Potential excellence (UGC-UPE II) (Grant No. UPE-4004214/20UGC-UPE II). The author PH has received fellowship award (Ref. No: 21/06/2015(i)EU-V) from University Grants Commission (UGC), New Delhi, India.
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PH: data curation, formal analysis, investigation, methodology, software, writing—original draft, writing—review and editing, visualization, validation; UP: data curation, methodology, writing—review and editing; AG: data curation; PG: investigation, writing—review and editing, project administration; AR: formal analysis, methodology, writing—review and editing; SS: resources, writing—review and editing; SG: conceptualization, funding acquisition, investigation, resources, writing—original draft, writing—review and editing, visualization, supervision, project administration.
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Halder, P., Pal, U., Ganguly, A. et al. Genetic aetiology of Down syndrome birth: novel variants of maternal DNMT3B and RFC1 genes increase risk of meiosis II nondisjunction in the oocyte. Mol Genet Genomics 298, 293–313 (2023). https://doi.org/10.1007/s00438-022-01981-4
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DOI: https://doi.org/10.1007/s00438-022-01981-4