What does adenine mean?
Adenine is one of the four chemical bases that make up DNA and RNA, the molecules that carry genetic information in all living things. A member of the purine family of compounds, it pairs specifically with thymine in DNA and with uracil in RNA, forming the rungs of the famous double-helix ladder. Beyond its role in heredity, adenine is a crucial component of adenosine triphosphate (ATP), the molecule cells use to store and transfer energy, as well as cofactors such as NAD and FAD. The word derives from the Greek 'aden', meaning gland, because the compound was first isolated from pancreatic tissue in the late nineteenth century. Adenine appears almost entirely in scientific writing — textbooks, research papers, and educational materials on biology and medicine — where it is typically abbreviated simply as 'A'. Its precise pairing behaviour underlies DNA replication and transcription, making it fundamental to life itself.
nounA purine base, one of the four nucleobases in DNA and RNA, that pairs with thymine in DNA and with uracil in RNA; it is also a component of ATP and other biologically important molecules.
- The purine nucleobase that pairs with thymine in DNA and uracil in RNA.
- The same compound as a constituent of energy-carrying molecules such as ATP, ADP, NAD, and FAD.
"In the double helix, adenine always pairs with thymine through two hydrogen bonds."
"Each rung of the DNA ladder is formed when adenine on one strand bonds with thymine on the other."
"The cell releases energy by breaking the terminal phosphate bond of adenosine triphosphate, whose backbone contains adenine."
The plural is used mainly in technical contexts to refer to multiple individual adenine molecules or residues within a nucleic acid sequence.
"The sequence contains three consecutive adenines near the start codon."
Adenine was first isolated not from DNA but from the pancreas — and it's the 'A' in ATP, the molecule your body burns for energy every second of your life.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of adenine
The word 'adenine' was coined in the late nineteenth century by German biochemist Albrecht Kossel, who derived it from the Greek 'adēn' meaning 'gland', reflecting its initial isolation from the pancreas (a glandular organ). The suffix '-ine' is common in names of organic bases such as caffeine and nicotine. The Greek root 'adēn' also gives us related scientific terms including 'adenoid', 'adenoma', and 'adenosine', the nucleoside formed when adenine attaches to a ribose sugar.
How adenine is actually used
Adenine is a technical term used almost exclusively in biochemistry, genetics, and molecular biology. It functions as an uncountable noun when referring to the substance generally, but can take a plural form when referring to individual molecules or residues within a sequence.
Easily confused with adenine
Adrenaline is a hormone produced by the adrenal glands, whereas adenine is a nitrogenous base found in DNA and RNA.
Guanine is a different purine base in DNA and RNA that pairs with cytosine, while adenine pairs with thymine or uracil.