Toute #vie sur #Terre provient d'un seul ancêtre: #LUCA. Et il est bien plus ancien qu'on ne le pensait

https://www.science-et-vie.com/science-et-culture/toute-vie-sur-terre-provient-dun-seul-ancetre-luca-et-il-est-bien-plus-ancien-quon-ne-le-pensait-193878.html

Life on Earth may have started earlier than previously thought.

All life on Earth can be traced back to a Last Universal Common Ancestor, or LUCA.

A study suggests that this organism likely lived on Earth only 400 million years after its formation.

Further analysis also shows that this life form likely sported an early immune system, which means it was probably fighting off viruses.

https://www.popularmechanics.com/science/environment/a64186168/single-ancestor-life-luca-discovery/

The nature of the last universal common ancestor and its impact on the early Earth system: https://www.nature.com/articles/s41559-024-02461-1 -> New findings raise questions about when (and where) life began: https://bigthink.com/hard-science/new-findings-raise-questions-about-when-and-where-life-began/ - a recent study pushes back the estimated age of the Last Universal Common Ancestor #LUCA to around 4.2 billion years ago, several hundred million years older than previous estimates.

#Luca -- last universal common ancestor, the progenitor of all known life on Earth...'born 4.2bn years ago. Back then our planet was no Eden but something of a hell on Earth: a seething mass of volcanoes pummelled by giant meteorites, and having recovered from a cosmic collision that blasted the world apart and created the moon from some of the fragments.'

We wouldn't be here without that #moon

#lifeonearth

https://www.theguardian.com/science/2025/jan/19/luca-is-the-progenitor-of-all-life-on-earth-but-its-genesis-has-implications-far-beyond-our-planet

Kerala science Slam 2024 @ IIT palakkad. Minister R bindu #luca

Sabine Hossenfelder - "Life Began Much Faster Than We Thought." #luca https://youtube.com/watch?v=wHWKfa7PdOE&si=Z1fBg5kr1MbCIQP0

No recuerdo si ya compartí esto o no (seguramente sí), pero lo adopto como mi carta de #presentación.

Demasiada magia en, apenas, 8 segundos…

I know /a #Luca/, but not this one.

https://en.wikipedia.org/wiki/Last_universal_common_ancestor

I'm on the Disney Treasure this week and our room is Luca- themed! Love these art pieces #DisneyCruiseLine #Pixar #Luca

Been listening a lot to some of the music from #Luca.
Thx to @pietervdvn again for recommending we all watch it together (@queerthoughts also enjoyed it).
https://www.youtube.com/watch?v=czIFDIg_0EU

Meet LUCA, the 4.2 billion-year-old cell that's the ancestor of all life on Earth today
https://www.livescience.com/animals/meet-luca-the-4-2-billion-year-old-cell-that-s-the-ancestor-of-all-life-on-earth-today
#Earth #life #bacteria #LUCA #ecosystem

The nature of the last universal common ancestor (#LUCA) have been the subject of vigorous debate across diverse disciplines.

Age estimates for LUCA are usually based on the fossil record, varying with every reinterpretation while #metabolism has proven equally contentious.

New results indicate that LUCA lived ~4.2 Ga ago and had a genome of at least 2.5 Mb, encoding around 2600 #proteins.

#evolution #abiogenesis
https://www.nature.com/articles/s41559-024-02461-1

#LastUniversalCommonAncestor #LUCA #NotTheFirstLivingOrganism

Major Discoveries About LUCA - Organism All Life Evolved From. https://youtube.com/watch?v=DOUTF2cH4Ao&si=lbuLxeQMO7xKrUd4

Wir reden diese Woche über euer Feedback und es gab viel zu besprechen:

den Urknall und vor allem seine Lautstärke
das Alter des Urvorfahren allen Lebens LUCA
der interstellare Besucher Oumuamua

https://astrogeo.de/astrogeoplankel-urknall-laerm-urvorfahr-oumamua/

Letzterer führte nicht nur zwischen Franzi und Karl zu Kontroversen - sondern auch zwischen euch! Zum Glück aber können wir ja über alles reden, nicht?

Der gemeinsame Vorfahre aller bekannten #Lebewesen war überraschend modern - #Paläontologie
https://www.derstandard.at/story/3000000231162/der-gemeinsame-vorfahre-aller-bekannten-lebewesen-war-ueberraschend-modern?ref=rss

Sehr spannender Artikel über ein faszinierendes Grundlagen-Thema.

Age estimates for #LUCA
(the Last Universal Common Ancestor of all life )
are usually based on the fossil record, varying with every reinterpretation.
The nature of LUCA’s metabolism has proven equally contentious,
with some attributing all core metabolisms to LUCA,
whereas others reconstruct a simpler life form dependent on geochemistry.
Here we infer that LUCA lived
~4.2 Ga(billion years ago)
through divergence time analysis of pre-LUCA gene duplicates,
calibrated using microbial fossils and isotope records under a new cross-bracing implementation.
Phylogenetic reconciliation suggests that LUCA had a genome of at least 2.5 Mb (2.49–2.99 Mb),
encoding around 2,600 proteins,
comparable to modern prokaryotes.
Our results suggest LUCA was a prokaryote-grade anaerobic acetogen
that possessed an early immune system.
Although LUCA is sometimes perceived as living in isolation,
we infer LUCA to have been part of an established ecological system.
The metabolism of LUCA would have provided a niche for other microbial community members
and hydrogen recycling by atmospheric photochemistry could have supported a modestly productive early ecosystem.
https://www.nature.com/articles/s41559-024-02461-1

*Hey, this seems great. Maybe we could rebuild the "Last Universal Common Ancestor" and use it to brew beer or something. #LUCA

https://www.nature.com/articles/s41559-024-02461-1

Les chercheurs ont fait la lumière sur le premier écosystème de la Terre, montrant qu'en quelques centaines de millions d'années après la formation planétaire, la vie sur Terre était déjà florissante
Tout ce qui est vivant aujourd'hui provient d'un seul ancêtre commun connu affectueusement sous le nom de LUCA
https://www.sciencedaily.com/releases/2024/07/240712124116.htm
#LUCA #Terre #science #biologie #évolution #génétique