Organic #molecules delivered from #extraterrestrial materials may have played a key role in supplying building blocks for #life on #Earth.

Now scientists report all five canonical #nucleobases—purines (#adenine and #guanine) and pyrimidines (#cytosine, #thymine and #uracil)—in samples returned from the C-type #asteroid (162173) #Ryugu.

Samples from Ryugu, #Bennu and #Orgueil, which have a similar mineralogy and elemental composition, show purine-to-pyrimidine ratios negatively correlating with #ammonia.

These observations indicate that the nucleobases in these samples may have formed via a shared pathway depending on the physicochemical environment of the respective parent bodies.

The detection of diverse nucleobases in asteroid and meteorite materials demonstrates their widespread presence throughout the Solar System and reinforces the hypothesis that carbonaceous asteroids contributed to the #prebiotic chemical inventory of early Earth.

#astronomy #astrobiology
https://www.nature.com/articles/s41550-026-02791-z

❛❛ #adenine #guanine #cytosine #thymine & #uracil … necessary to build #DNA & #RNA … traces of important organic compounds like xanthine, hypoxanthine, & nicotinic acid (#vitamin B3).
In addition to suggesting that life could exist elsewhere in the #universe, the #molecules found on Bennu raise provocative questions about the #origins of #life on #Earth. ❜❜

#Bennu #asteroid was discovered in 1999 & sampled in 2020.

🔗 https://www.Salon.com/2025/01/30/building-blocks-of-life-discovered-on-asteroid-bennu/ 2025 Jan 30
🔗 https://Wikipedia.org/wiki/101955_Bennu

#Kronodon

The Basics of Purines and Pyrimidines: Understanding the Building Blocks of DNA and RNA

#Adenine, #CellSignaling, #Cytosine, #DNA, #EnzymeRegulation, #Guanine, #Purines, #Pyrimidines, #RNA, #Thymine, #Uracil #Genetics In the realm of molecular biology, few molecules are as crucial as purines and pyrimidines. These organic compounds serve as…. Medical Microbiology & Recombinant DNA Technology (RDT) Labs | Read More -

https://micrordt.wordpress.com/2024/05/15/the-basics-of-purines-and-pyrimidines-understanding-the-building-blocks-of-dna-and-rna/

Deciphering the Blueprint of Life: Exploring the Structure of DNA

#Adenine, #Blueprint, #Cytosine, #DeoxyriboseSugar, #DNA, #DNACoiling, #DoubleHelix, #Guanine, #Histone, #MajorGroove, #MinorGroove, #NitrogenousBases, #Nucleotide, #Phosphate, #StructureOfDNA, #Thymine, #WatsonAndCrick #Biochemistry, #Genetics The discovery of the structure of DNA stands as one of the most significant milestones in the history of science. Deoxyribonucleic acid, or DNA, is the molecule…

https://micrordt.wordpress.com/2024/04/27/deciphering-the-blueprint-of-life-exploring-the-structure-of-dna/

DNA Base Models

https://personaljournal.ca/paigntonlibrarystemgroup/dna-base-models

Structural and #biochemical basis of methylmalonate semialdehyde_dehydrogenase #ALDH6A1.

#valine #thymine

https://phys.org/news/2024-03-biochemical-basis-methylmalonate-semialdehyde-dehydrogenase.html