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BMC Medical Genetics
Published in: BMC Medical Genetics 1/2019

Open Access 01-12-2019 | Colorectal Cancer | Research article

Screening and computational analysis of colorectal associated non-synonymous polymorphism in CTNNB1 gene in Pakistani population

Authors: Suhail Razak, Nousheen Bibi, Javid Ahmad Dar, Tayyaba Afsar, Ali Almajwal, Zahida Parveen, Sarwat Jahan

Published in: BMC Medical Genetics | Issue 1/2019

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Abstract

Background

Colorectal cancer (CRC) is categorized by alteration of vital pathways such as β-catenin (CTNNB1) mutations, WNT signaling activation, tumor protein 53 (TP53) inactivation, BRAF, Adenomatous polyposis coli (APC) inactivation, KRAS, dysregulation of epithelial to mesenchymal transition (EMT) genes, MYC amplification, etc. In the present study an attempt was made to screen CTNNB1 gene in colorectal cancer samples from Pakistani population and investigated the association of CTNNB1 gene mutations in the development of colorectal cancer.

Methods

200 colorectal tumors approximately of male and female patients with sporadic or familial colorectal tumors and normal tissues were included. DNA was extracted and amplified through polymerase chain reaction (PCR) and subjected to exome sequence analysis. Immunohistochemistry was done to study protein expression. Molecular dynamic (MD) simulations of CTNNB1WT and mutant S33F and T41A were performed to evaluate the stability, folding, conformational changes and dynamic behaviors of CTNNB1 protein.

Results

Sequence analysis revealed two activating mutations (S33F and T41A) in exon 3 of CTNNB1 gene involving the transition of C.T and A.G at amino acid position 33 and 41 respectively (p.C33T and p.A41G). Immuno-histochemical staining showed the accumulation of β-catenin protein both in cytoplasm as well as in the nuclei of cancer cells when compared with normal tissue. Further molecular modeling, docking and simulation approaches revealed significant conformational changes in the N-terminus region of normal to mutant CTNNB1 gene critical for binding with Glycogen synthase kinase 3-B (GSK3) and transducin containing protein1 (TrCp1).

Conclusion

Present study on Pakistani population revealed an association of two non-synonymous polymorphisms in the CTNNB1 gene with colorectal cancer. These genetic variants led to the accumulation of the CTNNB1, a hallmark of tumor development. Also, analysis of structure to function alterations in CTNNB1 gene is crucial in understanding downstream biological events.
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Metadata
Title
Screening and computational analysis of colorectal associated non-synonymous polymorphism in CTNNB1 gene in Pakistani population
Authors
Suhail Razak
Nousheen Bibi
Javid Ahmad Dar
Tayyaba Afsar
Ali Almajwal
Zahida Parveen
Sarwat Jahan
Publication date
01-12-2019
Publisher
BioMed Central
Published in
BMC Medical Genetics / Issue 1/2019
Electronic ISSN: 1471-2350
DOI
https://doi.org/10.1186/s12881-019-0911-y

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