title: On a stochastic gene expression with pre-mRNA, mRNA and protein contribution.
abstract: In this paper we develop a model of stochastic gene expression, which is an extension of the model investigated in the paper [T. Lipniacki, P. Paszek, A. Marciniak-Czochra, A.R. Brasier, M. Kimmel, Transcriptional stochasticity in gene expression, J. Theor. Biol. 238 (2006) 348-367]. In our model, stochastic effects still originate from random fluctuations in gene activity status, but we precede mRNA production by the formation of pre-mRNA, which enriches classical transcription phase. We obtain a stochastically regulated system of ordinary differential equations (ODEs) describing evolution of pre-mRNA, mRNA and protein levels. We perform mathematical analysis of a long-time behavior of this stochastic process, identified as a piece-wise deterministic Markov process (PDMP). We check exact results using numerical simulations for the distributions of all three types of particles. Moreover, we investigate the deterministic (adiabatic) limit state of the process, when depending on parameters it can exhibit two specific types of behavior: bistability and the existence of the limit cycle. The latter one is not present when only two kinds of gene expression products are considered.
authors.affiliation: Institute of Mathematics, Polish Academy of Sciences, Bankowa 14, 40-007 Katowice, Poland. Electronic address: ryszard.rudnicki@us.edu.pl.
authors.forename: Ryszard
authors.initials: R
authors.lastname: Rudnicki
authors.affiliation: Institute of Mathematics, Jagiellonian University, Łojasiewicza 6, 30-348 Kraków, Poland. Electronic address: andrzej.tomski@im.uj.edu.pl.
authors.forename: Andrzej
authors.initials: A
authors.lastname: Tomski
mesh_terms: D003198:Computer Simulation; D005786:Gene Expression Regulation; D008390:Markov Chains; D008957:Models, Genetic; D011506:Proteins / Q000378:metabolism*; D012322:RNA Precursors / Q000235:genetics* / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D013269:Stochastic Processes
chemical_list: D011506:Proteins; D012322:RNA Precursors; D012333:RNA, Messenger
keywords: Invariant density; Piece-wise deterministic Markov process; Pre-mRNA; Stochastic gene expression