Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 3 de 3
Filtrar
Mais filtros










Base de dados
Intervalo de ano de publicação
1.
Mol Cell Biol ; 41(11): e0009021, 2021 10 26.
Artigo em Inglês | MEDLINE | ID: mdl-34398682

RESUMO

DNA polymerase kappa (Pol κ) has been well documented thus far for its specialized DNA synthesis activity during translesion replication, progression of replication forks through regions difficult to replicate, restart of stalled forks, and replication checkpoint efficiency. Pol κ is also required for the stabilization of stalled forks, although the mechanisms are poorly understood. In this study, we unveiled an unexpected role for Pol κ in controlling the stability and abundance of checkpoint kinase 1 (Chk1), an important actor for the replication checkpoint and fork stabilization. We found that loss of Pol κ decreased the Chk1 protein level in the nuclei of four human cell lines. Pol κ and not the other Y family polymerase members is required to maintain the Chk1 protein pool all along the cell cycle. We showed that Pol κ depletion affected the protein stability of Chk1 and protected it from proteasome degradation. Importantly, we also observed that the fork restart defects observed in Pol κ-depleted cells could be overcome by the reexpression of Chk1. Strikingly, this new function of Pol κ does not require its catalytic activity. We propose that Pol κ could contribute to the protection of stalled forks through Chk1 stability.


Assuntos
Quinase 1 do Ponto de Checagem/metabolismo , Replicação do DNA/fisiologia , DNA Polimerase Dirigida por DNA/metabolismo , Ciclo Celular/genética , Linhagem Celular , Proliferação de Células/genética , Dano ao DNA/genética , Reparo do DNA/genética , DNA Polimerase Dirigida por DNA/genética , Células HCT116 , Células HEK293 , Humanos
2.
Sci Rep ; 11(1): 13195, 2021 06 23.
Artigo em Inglês | MEDLINE | ID: mdl-34162976

RESUMO

Chromatin organization within the nuclear volume is essential to regulate many aspects of its function and to safeguard its integrity. A key player in this spatial scattering of chromosomes is the nuclear envelope (NE). The NE tethers large chromatin domains through interaction with the nuclear lamina and other associated proteins. This organization is perturbed in cells from Hutchinson-Gilford progeria syndrome (HGPS), a genetic disorder characterized by premature aging features. Here, we show that HGPS-related lamina defects trigger an altered 3D telomere organization with increased contact sites between telomeres and the nuclear lamina, and an altered telomeric chromatin state. The genome-wide replication timing signature of these cells is perturbed, with a shift to earlier replication for regions that normally replicate late. As a consequence, we detected a higher density of replication forks traveling simultaneously on DNA fibers, which relies on limiting cellular dNTP pools to support processive DNA synthesis. Remarkably, increasing dNTP levels in HGPS cells rescued fragile telomeres, and improved the replicative capacity of the cells. Our work highlights a functional connection between NE dysfunction and telomere homeostasis in the context of premature aging.


Assuntos
Cromatina/ultraestrutura , Desoxirribonucleotídeos/metabolismo , Lamina Tipo A/fisiologia , Lâmina Nuclear/patologia , Progéria/genética , Homeostase do Telômero/genética , Telômero/patologia , Adulto , Animais , Células Cultivadas , Senescência Celular/genética , Dano ao DNA , Replicação do DNA , Fibroblastos , Genes Reporter , Proteínas de Fluorescência Verde , Código das Histonas , Humanos , Recém-Nascido , Lamina Tipo A/análise , Lamina Tipo A/deficiência , Lamina Tipo A/genética , Lamina Tipo B/análise , Camundongos , Camundongos Knockout , Progéria/patologia , Proteínas Recombinantes de Fusão/metabolismo , Pele/patologia
3.
Mutat Res ; 808: 62-73, 2018 03.
Artigo em Inglês | MEDLINE | ID: mdl-28843435

RESUMO

Replication stress is a strong and early driving force for genomic instability and tumor development. Beside replicative DNA polymerases, an emerging group of specialized DNA polymerases is involved in the technical assistance of the replication machinery in order to prevent replicative stress and its deleterious consequences. During S-phase, altered progression of the replication fork by endogenous or exogenous impediments induces replicative stress, causing cells to reach mitosis with genomic regions not fully duplicated. Recently, specific mechanisms to resolve replication intermediates during mitosis with the aim of limiting DNA damage transmission to daughter cells have been identified. In this review, we detail the two major actions of specialized DNA polymerases that limit DNA damage transmission: the prevention of replicative stress by non-B DNA replication and the recovery of stalled replication forks.


Assuntos
Dano ao DNA , Reparo do DNA , Replicação do DNA , DNA Polimerase Dirigida por DNA/metabolismo , Instabilidade Genômica , Humanos
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...