Two novel aspects of the kinetics of gene expression including miRNAs
Artikel i vetenskaplig tidskrift, 2013

In eukaryotic cells, many genes are transcribed into non-coding RNAs. Small RNAs or, more specifically, microRNAs (miRNAs) form an abundant sub-class of such RNAs. miRNAs are transcribed as long noncoding RNA and then generated via a processing pathway down to the 20-24-nucleotide length. The key ability of miRNAs is to associate with target mRNAs and to suppress their translation and/or facilitate degradation. Using the mean-field kinetic equations and Monte Carlo simulations, we analyze two aspects of this interplay. First, we describe the situation when the formation of mRNA or miRNA is periodically modulated by a transcription factor which itself is not perturbed by these species. Depending on the ratio between the mRNA and miRNA formation rates, the corresponding induced periodic kinetics are shown to be either nearly harmonic or shaped as anti-phase pulses. The second part of the work is related to recent experimental studies indicating that differentiation of stem cells often involves changes in gene transcription into miRNAs and/or the interference between miRNAs, mRNAs and proteins. In particular, the regulatory protein obtained via mRNA translation may suppress the miRNA formation, and the latter may suppress in turn the miRNA-mRNA association and degradation. The corresponding bistable kinetics are described in detail.

gene transcription

micrornas

networks

switch

transcription

subcellular processes

oscillations

stochasticity

periodic perturbation

dynamics

mRNA and miRNA association and degradation

messenger-rna

mRNA

stem-cell differentiation

Författare

Vladimir Zhdanov

Chalmers, Teknisk fysik, Kemisk fysik

Central European Journal of Physics

1895-1082 (ISSN) 1644-3608 (eISSN)

Vol. 11 4 448-456

Ämneskategorier

Fysik

DOI

10.2478/s11534-013-0190-8

Mer information

Skapat

2017-10-06