{"ok":true,"nota":{"id":"60c061cc43703bc8","slug":"bacterias-pueden-morir-solas-por-una-proteina-que-se-pega-al-adn-en-su-60c061","titulo":"Bacterias pueden morir solas por una proteína que se pega al ADN en su división","resumen":"Observaron con microscopio bacterias de E. coli creciendo sin estrés, y registraron una proteína que se junta cerca del ADN antes de activar su respuesta de reparación. Vieron que el tiempo que dura esa estructura predice si la célula muere.","fuente":"biorxiv","fuenteNombre":"bioRxiv · preprints","color":"#be2628","autor":"Pollacco, J. J., Haygarth, T., Couturier, A., Lesterlin, C., Sherratt, D. J., Baker, R. E., Maini, P. K., Uphoff, S.","url":"https://www.biorxiv.org/content/10.64898/2026.10.19.760072v1?rss=1","imagen":"/hoy/portada/60c061cc43703bc8","tema":"ciencia","subtemas":["bacterias","escherichia coli","adn","muerte celular","microscopía"],"entidades":["Escherichia coli"],"formato":"dato","entretenimiento":false,"pubTs":"2026-10-21T00:00:00.000Z","indexTs":"2026-10-22T04:37:56.220Z","hash":"90918c574605683e73322c6c696a55d583b538b350d9702048ff32e063637f22","tsa":{"time":"Oct 22 04:38:22 2026 GMT","provider":"freetsa.org","sobre":"sello"},"stats":{"views":0,"likes":0,"clicks":0,"dwell":0},"tipo":"normal","registro":"hallazgo","porQueImporta":"Hasta en condiciones ideales, algunas bacterias se mueren solas, y ahora se sabe que la duración de una estructura proteica anticipa ese destino. Esto cambia la idea de que el daño en el ADN siempre viene de afuera. Para quien piensa en antibióticos y resistencia, entender por qué algunas células sobreviven y otras no abre la puerta a tratamientos más precisos. El trabajo se hizo solo en E. coli en laboratorio, así que hay que ver si pasa lo mismo en otras bacterias o en células humanas.","quienFirma":"bioRxiv (preprint; institución principal no especificada en el resumen)","confianza":"preprint","consulta":null},"sello":{"hash":"90918c574605683e73322c6c696a55d583b538b350d9702048ff32e063637f22","sello":"435c6e34dcfe0f742bfc5063ac149312096d0f711b92dfbb45e383354a7d59d5","beacon":{"drand":{"cadena":"8990e7a9aaed2ffed73dbd7092123d6f289930540d7651336225dc172e51b2ce","ronda":6573762,"aleatorio":"2bf3d68605c0cf93c7b24bcf7d4852029c1a8fd2dd29c3bf1b3b697bee72ee36","tiempo":"2026-10-22T04:38:00.000Z"},"nist":{"cadena":2,"pulso":1994086,"salida":"7C444532759162AF322A7FA62FB67EDB4DE6FC6E7A6186DDCB567613FCA6BF322E4D0A282AEEE85DC1460DE99BE46FB63B8A2617A10BE805A6618E195E0116AC","tiempo":"2026-10-22T04:37:00.000Z"},"noAntes":"2026-10-22T04:38:00.000Z"},"verificacion":{"drand":true,"nist":true},"tsa":{"time":"Oct 22 04:38:22 2026 GMT","provider":"freetsa.org","sobre":"sello"},"original":{"titulo":"RecA structure kinetics determine SOS dynamics and predict spontaneous cell death","descripcion":"Even under optimal growth conditions, bacterial cells experience endogenous stresses that threaten cellular function. Individual cells sporadically activate stress responses to restore homeostasis, but some cells ultimately die. The SOS response to DNA damage is particularly heterogeneous, but the origin of its spontaneous activation and its relationship to cell fate remain unclear. Here, we imaged fluorescently labelled RecA in single Escherichia coli cells under steady-state unperturbed growth using microfluidics. We find that RecA* structures assemble frequently near replication forks and precede SOS response pulses. RecA* structure lifetime quantitatively encodes the magnitude of SOS ind","pubDate":"2026-10-21","url":"https://www.biorxiv.org/content/10.64898/2026.10.19.760072v1?rss=1"},"indexado":"2026-10-22T04:37:56.220Z"}}