The pathways significantly down regulated in the EL population
included biosynthesis of secondary metabolites (33/44 gene
functions), DNA replication (8/10 gene functions), and photosynthesis
(e.g., 4/4 antenna proteins) with the latter likely being a
response to continuous light. For the DNA replication pathway,
the mini-chromosome maintenance (MCM) complex was significantly
down regulated (Fig. 3B). Several cell cycle genes (e.g.,
SCF, CycA, PCNA) were up regulated as would be expected in a
rapidly dividing cell population (Fig. S4). The MCM complex is a
helicase crucial to DNA replication and elongation that acts in the
G1 phase as part of the transition from the pre-replicative (pre-RC)
to the pre-initiation complex [37,38]. In fission yeast, lowered
expression of MCM complex proteins results in genome instability
and DNA damage (i.e., abundant pre-RC is important for
surviving replication stress that causes double-strand DNA breaks
[39,40]. Despite its key role in maintaining genome integrity under
stress [41], this complex was significantly down regulated in the
EL population as were the genes encoding DNA polymerase typeB
alpha, DNA polymerase delta subunit one, and the PFC-clamp
loader. The significant up regulation of the enzymes PCNA and
RPA, that are involved in DNA replication and damage repair
(Fig. 3B) may indicate that a balance was reached in EL cells
between speed (due to an enhanced growth rate) and fidelity of
DNA replication
The pathways significantly down regulated in the EL populationincluded biosynthesis of secondary metabolites (33/44 genefunctions), DNA replication (8/10 gene functions), and photosynthesis(e.g., 4/4 antenna proteins) with the latter likely being aresponse to continuous light. For the DNA replication pathway,the mini-chromosome maintenance (MCM) complex was significantlydown regulated (Fig. 3B). Several cell cycle genes (e.g.,SCF, CycA, PCNA) were up regulated as would be expected in arapidly dividing cell population (Fig. S4). The MCM complex is ahelicase crucial to DNA replication and elongation that acts in theG1 phase as part of the transition from the pre-replicative (pre-RC)to the pre-initiation complex [37,38]. In fission yeast, loweredexpression of MCM complex proteins results in genome instabilityand DNA damage (i.e., abundant pre-RC is important forsurviving replication stress that causes double-strand DNA breaks[39,40]. Despite its key role in maintaining genome integrity understress [41], this complex was significantly down regulated in theEL population as were the genes encoding DNA polymerase typeBalpha, DNA polymerase delta subunit one, and the PFC-clamploader. The significant up regulation of the enzymes PCNA andRPA, that are involved in DNA replication and damage repair(Fig. 3B) may indicate that a balance was reached in EL cellsbetween speed (due to an enhanced growth rate) and fidelity ofDNA replication
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