Before the 'Oxygen Apocalypse', Earth was purple, the oceans green, and H₂O's oxygen safely locked away 🟣
Then, bacteria developed a quantum lockpick 🗝️⚡
The seas rusted and the ancients died out. Complex organisms burn the fuel of this cataclysm still but pay the price by ageing 🦠
This is […]
Tom Cavalier-Smith in Cornwall UK 23 August 2017, photo by Neal C-S
I am happy to share the unfinished but nevertheless fascinating autobiography of the late Thomas Cavalier-Smith, written in 2020, shortly before Tom passed away in 2021. I thank Ema Cavalier-Smith for sharing the text with me. I recently finished curating […]
[Original post on biologists.social]
Some of our earliest microbial ancestors, the Asgard archaea, were able to use oxygen, says new study in @nature.com. It may solve a mystery about how complex life first arose.
#AsgardArchaea #MicrobialEcology #Eukaryogenesis #TexasScience @utmsi.bsky.social @archaeal.bsky.social
By combining the ecological and evolutionary analyses, we present a Heimdallarchaeia-centric model for the origin of eukaryotes, based on our expanded genomic catalogue. #eukaryogenesis
9/12
By combining the ecological and evolutionary analyses, we present a Heimdallarchaeia-centric model for the origin of eukaryotes, based on our expanded genomic catalogue. #eukaryogenesis 9/12
Extrusomes like mucocysts, trichocysts have a bacteria-viral origin, from a bacteria phage gone wrong. Find out how Protistology chapter 21.2 doi.org/10.1016/B978... -461. #protists #protistsonsky #eukaryogenesis
How did the Asgard archaea and proteobacteria form a symbiosis that led to the first eukaryote? The important role of syntrophy. #protists #protistsonsky #archaea #eukaryogenesis
Protistology chapter 16.
Timing origin of eukaryote clades, protists and first fossil record. Reconciling phylogenies with the fossil record. Note how early and closely animals and fungi emerge; and how late brown algae. In Protistology chapter 15. #protistsonsky #paleontology #eukaryogenesis
"These findings imply a model of #eukaryogenesis in which key features of eukaryotic cell organization evolved in the Asgard lineage leading to the last eukaryotic common ancestor" ➡️ www.nature.com/articles/s41...
#evolution #archaea
Mutants of cell shape in Ciliophora provide clues to the variety of forms in protists. 1-Janus doublets vz the Metamonada double cell. 2-Multiplication of kinetids from 2 to 4 to 8, to many in hypermastigotes, opalinids. See Cell Shape review doi.org/10.1016/B978...
#Protists #Eukaryogenesis
a complicated figure from the linked paper showing a large circular evolutionary tree and two graphs
New #ISEPpapers #preprint! Environmental #phylogenetics supports a steady diversification of crown #eukaryotes starting from the mid Proterozoic www.biorxiv.org/content/10.6...
#Protists #Microbes #Evolution #Phylogeny #Proterozoic #Eukaryogenesis
simplified evolutionary trees of single genes from microbes
New #ISEPpapers! Eukaryotic Recombinases Duplicated After Divergence From Known Asgard Archaeal RadA: Implications for the Evolution of Sex During Eukaryogenesis academic.oup.com/gbe/article/... by Lisa Matsuo, @dackslabecb.bsky.social
#Microbes #Archaea #AsgardArchaea #Eukaryogenesis
don't forget the @sbcf.bsky.social special symposium on #eukaryogenesis!
we have available slots for oral presentation
Extensive lateral gene transfer between proto-eukaryotes and Heimdallarchaeia suggests their close association during eukaryogenesis
#Evolution #Eukaryotes #eukaryogenesis
onlinelibrary.wiley.com/doi/10.1002/...
a simplified evolutionary tree of eukaryotes with presence and absence of various genes mapped on it in the form of white or colorful circles
New #ISEPpapers! Eukaryote-Wide Distribution of a Family of Longin Domain-Containing GAP Complexes for Small GTPases onlinelibrary.wiley.com/doi/10.1111/... by Anna Novák Vanclová et al., @dackslabecb.bsky.social
#Protists #Microbes #Archaea #Eukaryogenesis #Evolution #Eukaryotes
Now online - the Review "Histone-mediated chromatin organization in prokaryotes and viruses" from @samuelschwab.bsky.social @vikramalva.bsky.social @damelab.bsky.social and co.
#histones #DNAorganization #chromatin #eukaryogenesis
Read it here 👉 authors.elsevier.com/sd/article/S...
a complicated figure showing several steps in evolution of a molecular mechanism in microbial cells
New #ISEPpapers! Repeated duplications and losses shaped SMC complex evolution from archaeal ancestors to modern eukaryotes: Jolien van Hooff et al. www.sciencedirect.com/science/arti...
#Protists #Microbes #Archaea #Eukaryogenesis #Evolution
Going deeper, duplications of SMC genes happened before eukaryotes: they trace back to the TACK + Asgard archaeal ancestor. This hints at sophisticated chromosome management in the archaeal lineage that gave rise to eukaryotes. #eukaryogenesis #archaea
Hmm, the Great Filter. Not a barrier, but a turning point. Like a caterpillar becoming a butterfly, the universe has transformed twice through singularities of consciousness. Now, the mind is poised for its own flight. Interesting... indeed. #GreatFilter #Evolution #Contemplation #Eukaryogenesis
The image shows the evolution of protein-coding gene length distributions across evolutionary time (ill./©: Fernando J. Ballesteros)
#EukaryoticCells emerged as evolutionary algorithmic phase transition / #Eukaryogenesis happened abruptly, led by tension of increasing gene length and constraints on producing longer #proteins 👉 press.uni-mainz.de/eukaryotic-c...
#EvolutionaryBiology #ComputerBiology #eukaryotic #genes #evolution
First Post! Thrilled to share our lab's first evolutionary cytoskeleton study! We uncover two distinct FtsZ paralogs in Odinarchaeota OdinFtsZ1 forms curved filaments, while OdinFtsZ2 assembles into spiral rings. A glimpse into tubulin evolution! threads👇 #Eukaryogenesis #AsgardArchaea #cytoskeleton
#ERGAReads | How did eukaryotic #cells evolve?
This paper explores progress towards understanding the biology of the last #eukaryotic common ancestor (LECA) & outlines a community approach to inferring its wider gene repertoire
🔗 doi.org/10.1371/jour...
#Eukaryogenesis #Genomics
schematic of molecular interactions between cellular organelles
New #ISEPpapers! Evolutionary origins of the lysosome-related organelle sorting machinery reveal ancient homology in post-endosome trafficking pathways: Kiran More et al. www.pnas.org/doi/10.1073/...
#protists #microbes #CellBiology #eukaryogenesis #biology #organelles
Online: our evolutionary interrogation of eukaryotic Structural Maintenance of Chromosomes (SMC) complexes @maxraas.bsky.social @eelcotromer.bsky.social @lauraeme.bsky.social #SMCcomplexes #eukaryogenesis #LECA #condensin #cohesin #evolutionarycellbiology #chromatin 🧵(1/6) doi.org/10.1101/2024...
Bacterial tail anchors can target to the mitochondrial outer membrane #eukaryogenesis
