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A Method for Measuring RNA N6-methyladenosine Modifications in Cells and Tissues
08:56

A Method for Measuring RNA N6-methyladenosine Modifications in Cells and Tissues

Published on: December 5, 2016

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Premature polyadenylation of MAGI3 is associated with diminished N6-methyladenosine in its large internal exon

Thomas K Ni1,2,3, Jessica S Elman1,2,3, Dexter X Jin4,5

  • 1Department of Developmental, Chemical and Molecular Biology, Tufts University School of Medicine, 136 Harrison Ave, Boston, MA, 02111, USA.

Scientific Reports
|January 25, 2018
PubMed

Insights

Tumor suppressor genes (TSGs) can become oncogenes via premature polyadenylation (pPA). Reduced N6-methyladenosine (m6A) modification in MAGI3 and other TSGs correlates with pPA, suggesting m6A regulates this oncogenic switch.

Area of Science:

  • Molecular Biology
  • Cancer Genetics
  • RNA Biology

Background:

  • Tumor suppressor genes (TSGs) are crucial for preventing cancer but can be inactivated through truncation.
  • Premature polyadenylation (pPA) of the MAGI3 gene truncates its product, converting it from a TSG to a dominant-negative oncogene.
  • N6-methyladenosine (m6A) is a key RNA modification influencing gene expression and RNA fate.

Purpose of the Study:

  • To investigate the role of m6A modification in the pPA of MAGI3.
  • To determine if m6A regulates intronic pPA in other TSGs.
  • To explore the link between m6A levels and TSG function in breast cancer.

Main Methods:

  • Analysis of MAGI3 gene expression and m6A modification levels in breast cancer cells.
  • Comparison of m6A abundance in MAGI3 transcripts with and without pPA.
  • Bioinformatic analysis of public expression data for other TSGs (LATS1, BRCA1) in breast cancer versus normal mammary cells.

Main Results:

  • MAGI3 undergoes intronic pPA downstream of a large exon heavily modified by m6A.
  • Breast cancer cells with MAGI3 pPA show reduced m6A levels in the MAGI3 exon and transcripts.
  • Other TSGs (LATS1, BRCA1) also exhibit intronic pPA after large exons, with decreased m6A in cancer cells.

Conclusions:

  • Reduced m6A modification in specific exons correlates with intronic pPA of MAGI3 and other TSGs in breast cancer.
  • m6A may function as a regulatory mechanism controlling intronic pPA of TSGs.
  • Further research is warranted to elucidate the precise role of m6A in TSG regulation and cancer development.

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