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Ulaganathan K, Puranam K, Mukta S, Hanumanth SR. Expression profiling of luminal B breast tumor in Indian women. J Cancer Res Clin Oncol 2023; 149:13645-13664. [PMID: 37516983 DOI: 10.1007/s00432-023-05195-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2023] [Accepted: 07/17/2023] [Indexed: 08/01/2023]
Abstract
PURPOSE In this study, we aimed at profiling of luminal B breast cancer specific gene expression pattern in Indian women using mRNA-seq and validation based on TCGA expression data. METHODS RNA isolated from luminal B tumor and adjacent normal tissues was used for library construction and sequencing. Reference-based assemblies of these reads were used for differential gene expression analysis using DeSeq2. The DEGs were evaluated using TCGA expression data. Kaplan-Meier survival method was used to evaluate association between genes showing luminal B specific differential expression pattern and breast cancer prognosis and statistical significance was assessed using log-rank test. Alternate splicing analysis was done using rmats. RESULTS Differential expression analysis identified 2371 differentially expressed genes (DEGs) in luminal B breast tumors in comparison with adjacent normal tissues of Indian Women. Of them, 1692 DEGs were validated using TCGA luminal B paired samples. Integration of this data with the DEGs obtained by comparative analysis of unpaired luminal B with luminal A unpaired samples from TCGA resulted in 291 DEGs showing luminal B specific expression pattern. Further, 26 genes of prognostic value were identified. Differential splicing analysis between luminal B tumors and adjacent normal tissues in our cohort led to the identification of 687 genes showing significant differential alternate splicing events. CONCLUSION This study profiled gene expression pattern of luminal B tumors of Indian women and identified 26 key genes of prognostic value for luminal B breast cancer. This study also profiled differential alternate splicing and identified important alternate splicing events in luminal B breast cancer.
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Affiliation(s)
| | - Kaushik Puranam
- Department of Genetics, Osmania University, Hyderabad, Telangana, 500007, India
| | - Srinivasulu Mukta
- Department of Surgical Oncology, MNJ Institute of Oncology and RCC, Hyderabad, Telangana, India
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Khan MS, Hanif W, Alsakhen N, Jabbar B, Shamkh IM, Alsaiari AA, Almehmadi M, Alghamdi S, Shakoori A, Al Farraj DA, Almutairi SM, Hussein Issa Mohammed Y, Abouzied AS, Rehman AU, Huwaimel B. Isoform switching leads to downregulation of cytokine producing genes in estrogen receptor positive breast cancer. Front Genet 2023; 14:1230998. [PMID: 37900178 PMCID: PMC10611502 DOI: 10.3389/fgene.2023.1230998] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2023] [Accepted: 09/18/2023] [Indexed: 10/31/2023] Open
Abstract
Objective: Estrogen receptor breast cancer (BC) is characterized by the expression of estrogen receptors. It is the most common cancer among women, with an incidence rate of 2.26 million cases worldwide. The aim of this study was to identify differentially expressed genes and isoform switching between estrogen receptor positive and triple negative BC samples. Methods: The data were collected from ArrayExpress, followed by preprocessing and subsequent mapping from HISAT2. Read quantification was performed by StringTie, and then R package ballgown was used to perform differential expression analysis. Functional enrichment analysis was conducted using Enrichr, and then immune genes were shortlisted based on the ScType marker database. Isoform switch analysis was also performed using the IsoformSwitchAnalyzeR package. Results: A total of 9,771 differentially expressed genes were identified, of which 86 were upregulated and 117 were downregulated. Six genes were identified as mainly associated with estrogen receptor positive BC, while a novel set of ten genes were found which have not previously been reported in estrogen receptor positive BC. Furthermore, alternative splicing and subsequent isoform usage in the immune system related genes were determined. Conclusion: This study identified the differential usage of isoforms in the immune system related genes in cancer cells that suggest immunosuppression due to the dysregulation of CXCR chemokine receptor binding, iron ion binding, and cytokine activity.
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Affiliation(s)
| | - Waqar Hanif
- Department of Bioinformatics, Department of Sciences, School of Interdisciplinary Engineering & Science (SINES), National University of Sciences and Technology (NUST), Islamabad, Pakistan
| | - Nada Alsakhen
- Department of Chemistry, Faculty of Science, The Hashemite University, Zarqa, Jordan
| | - Basit Jabbar
- Centre of Excellence in Molecular Biology, University of the Punjab, Lahore, Pakistan
| | - Israa M. Shamkh
- Chemo and Bioinformatics Lab, Bio Search Research Institution, Giza, Egypt
| | - Ahad Amer Alsaiari
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, Taif University, Taif, Saudi Arabia
| | - Mazen Almehmadi
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, Taif University, Taif, Saudi Arabia
| | - Saad Alghamdi
- Laboratory Medicine Department, Faculty of Applied Medical Sciences, Umm Al-Qura University, Makkah, Saudi Arabia
| | - Afnan Shakoori
- Laboratory Medicine Department, Faculty of Applied Medical Sciences, Umm Al-Qura University, Makkah, Saudi Arabia
| | - Dunia A. Al Farraj
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Saeedah Musaed Almutairi
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh, Saudi Arabia
| | | | - Amr S. Abouzied
- Department of Pharmaceutical Chemistry, College of Pharmacy, University of Hail, Hail, Saudi Arabia
- Department of Pharmaceutical Chemistry, National Organization for Drug Control and Research (NOD CAR), Giza, Egypt
| | - Aziz-Ur Rehman
- Keystone Pharmacogenomics LLC, Bensalem, PA, United States
| | - Bader Huwaimel
- Department of Pharmaceutical Chemistry, College of Pharmacy, University of Hail, Hail, Saudi Arabia
- Medical and Diagnostic Research Center, University of Hail, Hail, Saudi Arabia
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