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PLoS One. 2012;7(6):e39914. doi: 10.1371/journal.pone.0039914. Epub 2012 Jun 29.

A retinoblastoma orthologue is a major regulator of S-phase, mitotic, and developmental gene expression in Dictyostelium.

Author information

1
Biology Department and Centre for Structural and Functional Genomics, Concordia University, Montreal, Canada.

Abstract

BACKGROUND:

The retinoblastoma tumour suppressor, Rb, has two major functions. First, it represses genes whose products are required for S-phase entry and progression thus stabilizing cells in G1. Second, Rb interacts with factors that induce cell-cycle exit and terminal differentiation. Dictyostelium lacks a G1 phase in its cell cycle but it has a retinoblastoma orthologue, rblA.

METHODOLOGY/PRINCIPAL FINDINGS:

Using microarray analysis and mRNA-Seq transcriptional profiling, we show that RblA strongly represses genes whose products are involved in S phase and mitosis. Both S-phase and mitotic genes are upregulated at a single point in late G2 and again in mid-development, near the time when cell cycling is reactivated. RblA also activates a set of genes unique to slime moulds that function in terminal differentiation.

CONCLUSIONS:

Like its mammalian counterpart Dictyostelium, RblA plays a dual role, regulating cell-cycle progression and transcriptional events leading to terminal differentiation. In the absence of a G1 phase, however, RblA functions in late G2 controlling the expression of both S-phase and mitotic genes.

PMID:
22768168
PMCID:
PMC3386910
DOI:
10.1371/journal.pone.0039914
[Indexed for MEDLINE]
Free PMC Article

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