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In-silico analysis of novel p.(Gly14Ser) variant of ATOX1 gene: plausible role in modulating ATOX1–ATP7B interaction

  • Niti Kumari
  • Aman Kumar
  • Amit Pal
  • Babu Ram Thapa
  • Manish Modi
  • Rajendra PrasadEmail author
Original Article
  • 36 Downloads

Abstract

Clinical heterogeneity is commonly observed in Wilson disease (WD), including cases with identical ATP7B mutations. It is thought to be an outcome of impairment in other genes involved in cellular copper homeostasis in addition to the mutations in the ATP7B gene. ATOX1, a copper chaperone that delivers copper to ATP7B, is a potential genetic modifier of WD. In the present study, we analyzed the genetic variations in the ATOX1 gene in 50 WD patients and 60 controls. We identified four novel variants, of which, the coding region variant c.40G > A, p.(Gly14Ser) was observed in 2% alleles. Interestingly, p.(Gly14Ser) was seen with an early onset age, reduced serum ceruloplasmin level and manifestations of liver and brain in a WD patient unlike the other having identical ATP7B mutation but normal ATOX1 alleles. Further, computational analysis predicted that p.(Gly14Ser) substitution, in the critical copper binding motif (MXCXG14C) of the protein, affects the protein–protein interaction involved in copper sharing and transfer between ATOX1 and ATP7B-MBD4. Our findings suggest that p.(Gly14Ser) variant of ATOX1 might play a role as a genetic modifier leading to phenotypic variation in WD.

Keywords

ATOX1 ATP7B Cu chaperone Modifier Phenotype Wilson disease 

Notes

Acknowledgements

We thank the patients and families for their kind participation and interest in this study. The work was supported by grants from the Indian Council of Medical Research, New Delhi, India (Grant Nos. 54/1/2014-BMS and 3/1/3/JRF-2012/HRD-53).

Compliance with ethical standards

Conflict of interest

The authors declare no conflicts of interest.

Supplementary material

11033_2019_4791_MOESM1_ESM.docx (258 kb)
Supplementary material 1 (DOCX 257 kb)

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Department of BiochemistryPGIMERChandigarhIndia
  2. 2.Department of BiochemistryAIIMSJodhpurIndia
  3. 3.Department of Pediatrics GastroenterologyPGIMERChandigarhIndia
  4. 4.Department of NeurologyPGIMERChandigarhIndia

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