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Functional characterization of the ABCG2 5' non-coding exon variants: Stem cell specificity, translation efficiency

Sára Sándor1, Theodora Jordanidisz1, Anita Schamberger1

  • 1Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary.

Biochimica Et Biophysica Acta
|May 19, 2016
PubMed

Insights

This study reveals how different 5' untranslated region (UTR) variants of ABCG2 mRNA fine-tune its expression. Certain variants are linked to stem cell pluripotency and drug resistance, impacting ABCG2

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Pharmacology

Background:

  • ABCG2 is a crucial multidrug transporter involved in protecting cells but also contributes to tumor multidrug resistance.
  • While ABCG2 protein regulation is well-studied, its mRNA-level regulation, particularly the role of 5' untranslated exon variants (5' UTRs), remains less understood.

Purpose of the Study:

  • To comprehensively characterize four ABCG2 mRNA variants with distinct exon 1 sequences.
  • To investigate the impact of these variants on drug inducibility, stem cell specificity, mRNA stability, and translation efficiency.

Main Methods:

  • Characterization of four ABCG2 mRNA variants differing in exon 1 sequences.
  • Analysis of drug inducibility, stem cell expression patterns, mRNA stability, and translation efficiency.
  • Comparison of transcript levels with pluripotency markers Oct4 and Nanog in human embryonic stem cells.

Main Results:

  • Chemotoxic drugs significantly alter the expression patterns of distinct ABCG2 mRNA isoforms, challenging the notion of some variants being purely "constitutive".
  • The E1A variant shows expression patterns linked to the undifferentiated state in human embryonic stem cells, correlating with Oct4 and Nanog levels.
  • No significant differences in mRNA stability were found, but the E1U variant exhibited markedly lower translation efficiency.

Conclusions:

  • The diverse 5' UTR variants of ABCG2 mRNA play a critical role in cell-type-specific regulation and fine-tuning of ABCG2 expression.
  • Understanding these mRNA variants is essential for comprehending ABCG2's dual role in cellular protection and drug resistance.
  • The findings highlight the importance of mRNA-level regulation in determining transporter function and potential therapeutic targeting.
Keywords:
5′ UTRABCG2Alternative promotersMCF-7Noncoding exonsStem cell

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