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Luca

All articles tagged with #luca

Amino Acids Entered Life's Code in Multiple Ways, Scientists Say
science5 days ago

Amino Acids Entered Life's Code in Multiple Ways, Scientists Say

A University of Arizona-led analysis rethinking the origin of life suggests the 20 canonical amino acids may have entered the genetic code from multiple abiotic routes rather than a single sequential order. Building on a 2024 PNAS study of protein domains in LUCA, newer work shows amino acids could originate from diverse early-Earth chemistry and that core cellular machinery can function with a reduced amino‑acid alphabet in engineered cells. This challenges the view that tryptophan was the last amino acid added and has implications for our understanding of early protolife on Earth and the search for life elsewhere, including oceans on Enceladus.

via Yahoo|
#amino-acids#enceladus#genetic-code
LUCA Existed 4.2 Billion Years Ago, Immune System Included, Redrawing Life’s Origins
science2 months ago

LUCA Existed 4.2 Billion Years Ago, Immune System Included, Redrawing Life’s Origins

New analysis pushes LUCA, the Last Universal Common Ancestor of all life, to about 4.2 billion years ago—roughly 400 million years after Earth formed—suggesting life began very early on our planet. The study reconstructs LUCA as a simple prokaryote that already had an immune system, implying primordial viruses were at play and that early microbes formed a recycling ecosystem with organisms like methanogens, offering new insight into how life evolved from its origins.

via Yahoo|
#42-billion-years-ago#early-life#immunity
Ancient Microbes May Have Emerged in Earth's Harsh Hadean Era
science3 months ago

Ancient Microbes May Have Emerged in Earth's Harsh Hadean Era

New geochemical data and molecular-clock analysis suggest life could have arisen during Earth's fiery Hadean period, about 4.4–4.2 billion years ago, with LUCA as the Last Universal Common Ancestor and LECA leading to modern eukaryotes; evidence points to liquid water despite extreme conditions, and ongoing genome recovery efforts may further refine when these ancestral stages appeared.

via indiandefencereview.com|
#hadean#leca#luca
Amino Acids May Have Arrived Out of Order, Rewriting Life's Origins
science5 months ago

Amino Acids May Have Arrived Out of Order, Rewriting Life's Origins

A University of Arizona study published in PNAS suggests the first amino acids did not appear in a simple, global sequence as traditionally thought. By analyzing the evolution of protein domains dating to LUCA, researchers find that tryptophan was more common in pre-LUCA life than post-LUCA, implying a more complex and regionally diverse origin of amino acids and a potentially ancient, diverse genetic code. These results challenge established timelines for life's beginnings and hint that amino acids could form in non-Earth environments, widening the search for extraterrestrial life (e.g., Enceladus' subsurface ocean).

via Indian Defence Review|
#aminoacids#geneticcode#luca
Scientists Discover Earth's Oldest Common Ancestor, Redefining Life's Origins
science6 months ago

Scientists Discover Earth's Oldest Common Ancestor, Redefining Life's Origins

Scientists have identified the last universal common ancestor (LUCA) of all life on Earth, dating it to around 4.2 billion years ago. LUCA was a complex, cellular organism that thrived in hot, oxygen-free environments using hydrogen-based metabolism and had early immune systems, indicating rapid evolution of life shortly after Earth's formation.

via The Brighter Side of News|
#early-earth#genome-reconstruction#luca
Study Challenges Traditional Understanding of Genetic Code Origins
science1 year ago

Study Challenges Traditional Understanding of Genetic Code Origins

A study led by Sawsan Wehbi at the University of Arizona suggests that the traditional understanding of genetic code evolution is flawed. The research indicates that early life forms preferred smaller amino acids and those binding to metals, with sulfuric amino acids joining later. This challenges the consensus based on the Urey-Miller experiment and suggests that the genetic code evolved through stages, with earlier codes now extinct. The findings have implications for astrobiology, particularly in sulfur-rich environments like Mars and Europa.

via Phys.org|
#amino-acids#evolution#genetic-code
LUCA: Earth's 4.2 Billion-Year-Old Ancestor Revealed
science2 years ago

LUCA: Earth's 4.2 Billion-Year-Old Ancestor Revealed

A University of Bristol-led study has pinpointed the existence of LUCA (Last Universal Common Ancestor) to about 4.2 billion years ago, revealing it as a complex organism with an early immune system. Through genetic analysis and evolutionary modeling, researchers found that LUCA played a crucial role in early Earth's ecosystems and was already engaged in an arms race with viruses. The study highlights LUCA's complexity and its environmental impact, suggesting that life may flourish on Earth-like biospheres elsewhere in the universe.

via SciTechDaily|
#early-earth#evolution#genetic-analysis