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Hidden RNA aging clock found in human sperm — Level A1 — diagram

Hidden RNA aging clock found in human spermCEFR A1

29 Jan 2026

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Adapted from U. Arizona, Futurity • CC BY 4.0

Photo by GuerrillaBuzz, Unsplash

Level A1 – Beginner
2 min
72 words
  • Scientists found a hidden RNA clock in sperm.
  • Older fathers have higher risks for children.
  • Sperm carry many different RNA molecules.
  • Researchers used a new sequencing method.
  • The change appears in mice and humans.
  • In mice there was a sharp age change.
  • Some sperm RNAs grow longer with age.
  • Adding old RNA changed early embryo cells.
  • Scientists hope to find ways to help sperm.
  • The finding was confirmed in human sperm samples.

Difficult words

  • scientist — people who study nature and do experiments
    Scientists
  • sperm — male reproductive cells that can make babies
  • molecule — a very small part of a substance
    molecules
  • sequence — to find the order of parts in something
    sequencing
  • embryo — an early stage of a baby before birth
  • confirm — to show that something is true
    confirmed

Tip: hover, focus or tap highlighted words in the article to see quick definitions while you read or listen.

Discussion questions

  • Do you know someone who is an older father?
  • Have you learned about cells in school?
  • Do you think scientists should try to help sperm?

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