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Genetic and expression deregulation of immunoregulatory genes in rheumatoid arthritis

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Abstract

Rheumatoid arthritis (RA) is one of the most common autoimmune diseases globally, and is an important public health concern, associating with early death and systemic complications. Although key development in RA treatment has already been made still RA affected individuals face comorbidity and disability. Therefore, there is a need to discover new risk factors in helping early diagnosis and treatment of RA. The present study is designed to assess the variations of Vitamin D receptor (VDR) and interleukin -6 (IL-6) in RA patients. Polymorphisms of said genes were calculated in 300 RA patients and 300 controls, using Tetra-ARMS polymerase chain reaction. Secondly, expression levels of selected genes were checked using the quantitative PCR (qPCR) and obtained results were evaluated using a different statistical test. Logistic regression analysis showed that frequency of mutant allele of VDR gene polymorphisms (rs11168268, OR = 4.84; 95% CI = 2.94–7.97; p = 0.0001; rs2248098, OR = 1.65; 95% CI = 1.07–2.54; p = 0.02) and IL-6 gene polymorphisms (rs184229712, OR = 2.47; 95% CI = 1.56–3.92, p = 0.0001; rs36215814, OR = 2.14; 95% CI = 1.30–3.53; p = 0.002) was observed significantly higher in RA patients vs controls. Expression analysis showed the significant upregulation of IL-6 (p < 0.0001) and downregulation of VDR gene (p < 0.0001) in RA cases vs controls. ROC curve analysis showed that downregulation of IL-6 (AUC = 0.86, p < 0.001) and upregulation of VDR (AUC = 0.77, p < 0.001) was act as the good diagnostic marker for detection/diagnosis of arthritis. In conclusions, data from the present study showed the significant involvement of VDR and IL-6 gene variations in RA pathogenesis.

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Data availability

All data generated or analyzed during this study are included in this published article.

Abbreviations

RA:

Rheumatoid Arthritis

VDR:

Vitamin D Receptor

IL-6:

Interleukin -6

Tetra-ARMS-PCR:

Tetra- Amplification-Refractory Mutation System Polymerase Chain Reaction

AUC:

Area Under Curve

VD:

Vitamin D

TAE:

Tris Acetic Acid EDTA

IDT:

Integrated DNA Technologies

CI:

Confidence Interval

ANOVA:

Analysis of Variance

ESR:

Erythrocyte Sedimentation Rate

Anti-CCP:

Cyclic Citrullinated Peptide Antibody

ESR:

Erythrocyte Sedimentation Rate

CRP:

C-Reactive Protein

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Acknowledgements

The authors are thankful to patients and staff of the military hospital (MH), Rawalpindi, for their contribution to this research.

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Authors and Affiliations

Authors

Contributions

All authors contributed to the study’s conception and design. Material preparation and data collection were performed by [MSK], [NM], [AAC], and [SUM]. Experimentation and analysis were performed by [FI], [SNA], [Q-u-AK], and [RA]. The first draft of the manuscript was written by [MZH] and [IM] and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Muhammad Zhaid Hussain.

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The authors declare that they have no conflict of interests.

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All authors have seen the manuscript and approved to submit the manuscript.

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All authors consent to the publication of the manuscript. Furthermore, consent from cases and controls was obtained to publish their data before submitting their paper to a journal.

Ethical approval

Present study was conducted after the prior approval by the Ethical Review Committee of the Military hospital, Rawalpindi (RTMC # RHE-2019-124-87). The procedures used in this study adhere to the tenets of the Declaration of Helsinki.

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Hussain, M.Z., Mahjabeen, I., Khan, M.S. et al. Genetic and expression deregulation of immunoregulatory genes in rheumatoid arthritis. Mol Biol Rep 48, 5171–5180 (2021). https://doi.org/10.1007/s11033-021-06518-3

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