Abstract:
:Stress-induced mutagenesis is a collection of mechanisms observed in bacterial, yeast, and human cells in which adverse conditions provoke mutagenesis, often under the control of stress responses. Control of mutagenesis by stress responses may accelerate evolution specifically when cells are maladapted to their environments, i.e., are stressed. It is therefore important to understand how stress responses increase mutagenesis. In the Escherichia coli Lac assay, stress-induced point mutagenesis requires induction of at least two stress responses: the RpoS-controlled general/starvation stress response and the SOS DNA-damage response, both of which upregulate DinB error-prone DNA polymerase, among other genes required for Lac mutagenesis. We show that upregulation of DinB is the only aspect of the SOS response needed for stress-induced mutagenesis. We constructed two dinB(o(c)) (operator-constitutive) mutants. Both produce SOS-induced levels of DinB constitutively. We find that both dinB(o(c)) alleles fully suppress the phenotype of constitutively SOS-"off" lexA(Ind(-)) mutant cells, restoring normal levels of stress-induced mutagenesis. Thus, dinB is the only SOS gene required at induced levels for stress-induced point mutagenesis. Furthermore, although spontaneous SOS induction has been observed to occur in only a small fraction of cells, upregulation of dinB by the dinB(o(c)) alleles in all cells does not promote a further increase in mutagenesis, implying that SOS induction of DinB, although necessary, is insufficient to differentiate cells into a hypermutable condition.
journal_name
Geneticsjournal_title
Geneticsauthors
Galhardo RS,Do R,Yamada M,Friedberg EC,Hastings PJ,Nohmi T,Rosenberg SMdoi
10.1534/genetics.109.100735subject
Has Abstractpub_date
2009-05-01 00:00:00pages
55-68issue
1eissn
0016-6731issn
1943-2631pii
genetics.109.100735journal_volume
182pub_type
杂志文章相关文献
GENETICS文献大全abstract::Long-range migrations and the resulting admixtures between populations have been important forces shaping human genetic diversity. Most existing methods for detecting and reconstructing historical admixture events are based on allele frequency divergences or patterns of ancestry segments in chromosomes of admixed indi...
journal_title:Genetics
pub_type: 杂志文章
doi:10.1534/genetics.112.147330
更新日期:2013-04-01 00:00:00
abstract::The idealized individual in many fungal species is a haploid self-sterile hermaphrodite that may be propagated by asexually produced spores or that may reproduce sexually. In field populations, polymorphism occurs for female-sterile/hermaphrodite status, and female-sterile mutants, which function only as males during ...
journal_title:Genetics
pub_type: 杂志文章
doi:
更新日期:1996-10-01 00:00:00
abstract::Understanding variation in allele frequencies across populations is a central goal of population genetics. Classical models for the distribution of allele frequencies, using forward simulation, coalescent theory, or the diffusion approximation, have been applied extensively for demographic inference, medical study des...
journal_title:Genetics
pub_type: 杂志文章
doi:10.1534/genetics.117.200493
更新日期:2017-07-01 00:00:00
abstract::We present a genetic map based on microsatellite polymorphisms for the African human malaria vector, Anopheles gambiae. Polymorphisms in laboratory strains were detected for 89% of the tested microsatellite markers. Genotyping was performed for individual mosquitos from 13 backcross families that included 679 progeny....
journal_title:Genetics
pub_type: 杂志文章
doi:
更新日期:1996-06-01 00:00:00
abstract::The molecular basis of the maternally inherited, heteroplasmic NCS2 mutant of maize was investigated. Analysis of the NCS2 mtDNA showed that it closely resembles the progenitor cmsT mitochondrial genome, except that the mutant genome contains a fused nad4-nad7 gene and is deleted for the small fourth exon of nad4. The...
journal_title:Genetics
pub_type: 杂志文章
doi:
更新日期:1994-11-01 00:00:00
abstract::Pontocerebellar hypoplasia type 1b (PCH1b) is an autosomal recessive disorder that causes cerebellar hypoplasia and spinal motor neuron degeneration, leading to mortality in early childhood. PCH1b is caused by mutations in the RNA exosome subunit gene, EXOSC3 The RNA exosome is an evolutionarily conserved complex, con...
journal_title:Genetics
pub_type: 杂志文章
doi:10.1534/genetics.116.195917
更新日期:2017-01-01 00:00:00
abstract::l(3)S12 is a vital locus whose function is required in embryos, early larvae, late pupae and oogenesis. We have identified a cold-sensitive allele, l(3)S12(3), and characterized conditional misexpression of the gene associated with this mutation as well as with several euchromatic insertions of l(3)S12+ transposons. S...
journal_title:Genetics
pub_type: 杂志文章
doi:
更新日期:1991-05-01 00:00:00
abstract::HO endonuclease-induced double-strand breaks (DSBs) within a direct duplication of Escherichia coli lacZ genes are repaired either by gene conversion or by single-strand annealing (SSA), with > 80% being SSA. Previously it was demonstrated that the RAD52 gene is required for DSB-induced SSA. In the present study, the ...
journal_title:Genetics
pub_type: 杂志文章
doi:
更新日期:1996-03-01 00:00:00
abstract::I reexamine the use of isolation by distance models as a basis for the estimation of demographic parameters from measures of population subdivision. To that aim, I first provide results for values of F-statistics in one-dimensional models and coalescence times in two-dimensional models, and make more precise earlier r...
journal_title:Genetics
pub_type: 杂志文章
doi:
更新日期:1997-04-01 00:00:00
abstract::It has been hypothesized that the ratio of X-linked to autosomal sequence diversity is influenced by unequal sex ratios in Drosophila melanogaster populations. We conducted a genome scan of single nucleotide polymorphism (SNP) of 378 autosomal loci in a derived European population and of a subset of 53 loci in an ance...
journal_title:Genetics
pub_type: 杂志文章
doi:10.1534/genetics.107.074922
更新日期:2007-09-01 00:00:00
abstract::Genetic adaptation to external stimuli occurs through the combined action of mutation and selection. A central problem in genetics is to identify loci responsive to specific selective constraints. Many tests have been proposed to identify the genomic signatures of natural selection by quantifying the skew in the site ...
journal_title:Genetics
pub_type: 杂志文章
doi:10.1534/genetics.113.152587
更新日期:2013-09-01 00:00:00
abstract::The bacterium Myxococcus xanthus glides over surfaces using two different locomotive mechanisms, called S (social) and A (adventurous) motility that enable cells to move both as groups and as individuals. Neither mechanism involves flagella. The functions of these two motors are coordinated by the activity of a small ...
journal_title:Genetics
pub_type: 杂志文章
doi:10.1534/genetics.107.076182
更新日期:2007-09-01 00:00:00
abstract::With the rise of both the number and the complexity of traits of interest, control of the false discovery rate (FDR) in genetic association studies has become an increasingly appealing and accepted target for multiple comparison adjustment. While a number of robust FDR-controlling strategies exist, the nature of this ...
journal_title:Genetics
pub_type: 杂志文章
doi:10.1534/genetics.116.193987
更新日期:2017-01-01 00:00:00
abstract::Biological evolution generates a surprising amount of site-specific variability in protein sequences. Yet, attempts at modeling this process have been only moderately successful, and current models based on protein structural metrics explain, at best, 60% of the observed variation. Surprisingly, simple measures of pro...
journal_title:Genetics
pub_type: 杂志文章
doi:10.1534/genetics.118.300699
更新日期:2018-04-01 00:00:00
abstract::In experiments with directional selection on a quantitative character a "reversed response" to selection is occasionally observed, when selection of individuals for a higher (lower) value of the character results in a lower (higher) value of the character among their offspring. A sudden change in environments or rando...
journal_title:Genetics
pub_type: 杂志文章
doi:
更新日期:1986-09-01 00:00:00
abstract::The formation and stability of epigenetically regulated chromatin is influenced by DNA replication and factors that modulate post-translational modifications on histones. Here we describe evidence that PCNA can affect silencing in Saccharomyces cerevisiae by facilitating deposition of H3 K56ac onto chromosomes. We pro...
journal_title:Genetics
pub_type: 杂志文章
doi:10.1534/genetics.107.084525
更新日期:2008-06-01 00:00:00
abstract::The contribution of epigenetic alterations to natural variation for gene transcription levels remains unclear. In this study, we investigated the functional targets of the maize chromomethylase ZMET2 in multiple inbred lines to determine whether epigenetic changes conditioned by this chromomethylase are conserved or v...
journal_title:Genetics
pub_type: 杂志文章
doi:10.1534/genetics.107.072702
更新日期:2007-10-01 00:00:00
abstract::In paramutation two alleles of a gene interact so that one of the alleles is epigenetically silenced. The silenced state is then genetically transmissible for many generations. The large (220 kbp) multigenic complex R-r is paramutable: its level of expression is changed during paramutation. R-r was found to exhibit in...
journal_title:Genetics
pub_type: 杂志文章
doi:
更新日期:1998-04-01 00:00:00
abstract::To gain new mechanistic insight into ER homeostasis and the biogenesis of secretory proteins, we screened a genomewide collection of yeast mutants for defective intracellular retention of the ER chaperone, Kar2p. We identified 87 Kar2p-secreting strains, including a number of known components in secretory protein modi...
journal_title:Genetics
pub_type: 杂志文章
doi:10.1534/genetics.109.101105
更新日期:2009-07-01 00:00:00
abstract::We have examined the stability of duplicated DNA sequences in the sexual phase of the life cycle of the basidiomycete fungus, Coprinus cinereus. We observed premeiotic de novo methylation in haploid nuclei containing either a triplication, a tandem duplication, or an ectopic duplication. Methylation changes were not o...
journal_title:Genetics
pub_type: 杂志文章
doi:
更新日期:1993-10-01 00:00:00
abstract::The large-scale systematic variation in nucleotide composition along mammalian and avian genomes has been a focus of the debate between neutralist and selectionist views of molecular evolution. Here we test whether the compositional variation is due to mutation bias using two new tests, which do not assume composition...
journal_title:Genetics
pub_type: 杂志文章
doi:
更新日期:2002-12-01 00:00:00
abstract::An article by Singh and colleagues in this issue of GENETICS quantifies variation in recombination rate across a small region of the Drosophila melanogaster genome, providing an opportunity for instructors of genetics to introduce or reinforce important concepts such as recombination and recombination rate variation, ...
journal_title:Genetics
pub_type: 评论,杂志文章
doi:10.1534/genetics.113.150771
更新日期:2013-06-01 00:00:00
abstract::The T-box genes comprise an ancient family of putative transcription factors conserved across species as divergent as Mus musculus and Caenorhabditis elegans. All T-box gene products are characterized by a novel 174-186-amino acid DNA binding domain called the T-box that was first discovered in the polypeptide product...
journal_title:Genetics
pub_type: 杂志文章
doi:
更新日期:1996-09-01 00:00:00
abstract::RNA interference (RNAi) in tissue culture cells has emerged as an excellent methodology for identifying gene functions systematically and in an unbiased manner. Here, we describe how RNAi high-throughput screening (HTS) in Drosophila cells are currently being performed and emphasize the strengths and weaknesses of the...
journal_title:Genetics
pub_type: 杂志文章,评审
doi:10.1534/genetics.106.069963
更新日期:2007-01-01 00:00:00
abstract::We have previously isolated mutants of Escherichia coli that replicate their DNA with increased fidelity. These mutants have a mutation in the dnaE gene, encoding the alpha subunit of DNA polymerase III. They were isolated in a mismatch-repair-defective mutL background, in which mutations can be considered to represen...
journal_title:Genetics
pub_type: 杂志文章
doi:
更新日期:1994-10-01 00:00:00
abstract::In fission yeast, regulation of p34cdc2 plays an important role in the checkpoint coupling mitosis to completion of DNA replication. The cdc2 mutations cdc2-3w (C67Y) and cdc2-4w (C67F) abolish checkpoint control without seriously affecting normal cell proliferation. However the molecular basis of this phenotype is no...
journal_title:Genetics
pub_type: 杂志文章
doi:
更新日期:1996-12-01 00:00:00
abstract::The occurrence and patterns of linkage disequilibrium between an inversion and allozymic loci within it or nearby have been used in attempts to discriminate among different hypotheses for the maintenance of variability. The interpretation of the data on the best-documented case, that of the nonrandom association betwe...
journal_title:Genetics
pub_type: 杂志文章
doi:
更新日期:1987-01-01 00:00:00
abstract::Identifying loci under natural selection from genomic surveys is of great interest in different research areas. Commonly used methods to separate neutral effects from adaptive effects are based on locus-specific population differentiation coefficients to identify outliers. Here we extend such an approach to estimate d...
journal_title:Genetics
pub_type: 杂志文章
doi:10.1534/genetics.108.092221
更新日期:2008-10-01 00:00:00
abstract::The identification of a second structural gene mutation at the feline arylsulfatase B locus (MPS VIb) provided the opportunity to investigate the expression of allelism by characterization of the residual enzymatic activity in feline mucopolysaccharidosis VI, an animal analogue of human Maroteaux-Lamy syndrome. Mating...
journal_title:Genetics
pub_type: 杂志文章
doi:
更新日期:1985-08-01 00:00:00
abstract::In Drosophila melanogaster, heterochromatin-induced silencing or position-effect variegation (PEV) of a reporter gene has provided insights into the properties of heterochromatin. Class I modifiers suppress PEV, and class II modifiers enhance PEV when the modifier gene is present in fewer than two doses. We have exami...
journal_title:Genetics
pub_type: 杂志文章
doi:
更新日期:1998-02-01 00:00:00