Comprehensive analysis of microRNAs in breast cancer
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  • 作者:Hong-Tai Chang (1) (2)
    Sung-Chou Li (3)
    Meng-Ru Ho (4)
    Hung-Wei Pan (5)
    Luo-Ping Ger (5)
    Ling-Yueh Hu (6)
    Shou-Yu Yu (5)
    Wen-Hsiung Li (4) (7)
    Kuo-Wang Tsai (5) (8)
  • 刊名:BMC Genomics
  • 出版年:2012
  • 出版时间:December 2012
  • 年:2012
  • 卷:13
  • 期:7-supp
  • 全文大小:539KB
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  • 作者单位:Hong-Tai Chang (1) (2)
    Sung-Chou Li (3)
    Meng-Ru Ho (4)
    Hung-Wei Pan (5)
    Luo-Ping Ger (5)
    Ling-Yueh Hu (6)
    Shou-Yu Yu (5)
    Wen-Hsiung Li (4) (7)
    Kuo-Wang Tsai (5) (8)

    1. Department of Surgery, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan, Republic of China
    2. Department of Emergency, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan, Republic of China
    3. Genomics Research Center, Academia Sinica, Taipei, Taiwan, Republic of China
    4. Biodiversity Research Center, Academia Sinica, Taipei, Taiwan, Republic of China
    5. Department of Medical Education and Research, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan, Republic of China
    6. Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan, Republic of China
    7. Department of Ecology and Evolution, University of Chicago, Chicago, IL 60637, USA
    8. Department of Biotechnology, Tajen University, Taiwan, Republic of China
文摘
Background MicroRNAs (miRNAs) are short noncoding RNAs (approximately 22 nucleotides in length) that play important roles in breast cancer progression by downregulating gene expression. The detailed mechanisms and biological functions of miRNA molecules in breast carcinogenesis have yet to be fully elucidated. This study used bioinformatics and experimental approaches to conduct detailed analysis of the dysregulated miRNAs, arm selection preferences, 3' end modifications, and position shifts in isoforms of miRNAs (isomiRs) in breast cancer. Methods Next-generation sequencing (NGS) data on breast cancer was obtained from the NCBI Sequence Read Archive (SRA). The miRNA expression profiles and isomiRs in normal breast and breast tumor tissues were determined by mapping the clean reads back to human miRNAs. Differences in miRNA expression and pre-miRNA 5p/3p arm usage between normal and breast tumor tissues were further investigated using stem-loop reverse transcription and real-time polymerase chain reaction. Results The analysis identified and confirmed the aberrant expression of 22 miRNAs in breast cancer. Results from pathway enrichment analysis further indicated that the aberrantly expressed miRNAs play important roles in breast carcinogenesis by regulating the mitogen-activated protein kinase (MAPK) signaling pathway. Data also indicated that the position shifts in isomiRs and 3' end modifications were consistent in breast tumor and adjacent normal tissues, and that 5p/3p arm usage of some miRNAs displayed significant preferences in breast cancer. Conclusions Expression pattern and arm selection of miRNAs are significantly varied in breast cancers through analyzing NGS data and experimental approach. These miRNA candidates have high potential to play critical roles in the progression of breast cancer and could potentially provide as targets for future therapy.

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