ephemeron

/ɪˈfɛm.ər.ɒn/

noun

Definitions

(Biochemistry) A protein that is rapidly degraded within a cell, typically having a half-life of less than 30 minutes.

Commonly refers to regulatory proteins such as transcription factors and cell cycle controllers that must be tightly regulated.
(General) Any substance or entity characterized by an exceptionally short lifespan or transient existence.

📜 Etymology

From Ancient Greek ephēmeros (ἐφήμερος), meaning "lasting only a day" (from epeí "upon" + hēméra "day") + suffix -on denoting a chemical substance or biological entity.

Usage Examples

"The p53 tumor suppressor is classified as an ephemeron, requiring constant synthesis to maintain steady-state levels in healthy cells."

— Journal of Molecular Biology, 2022

"Researchers tracked the degradation pathway of the ephemeron using fluorescent tagging and live-cell imaging."

— Cell & Developmental Biology, 2023

Synonyms & Related Terms

short-lived protein unstable protein labile protein transient factor regulatory protein rapidly degraded

Word Frequency

"Ephemeron" is a highly specialized scientific term. It appears primarily in academic literature, particularly in biochemistry, molecular biology, and cancer research. Frequency rank: Specialized / Rare.