Published 2 months ago

Oldest known animal sex chromosome evolved in octopuses 380 million years ago

Male O. Bimaculoides octopuses possess two copies of chromosome 17, while females have one copy, signaling sex determination.
The chromosome 17 in octopuses holds genes similar to those in human reproductive tissues, like sperm proteins.
Female octopuses are ZO, lacking a W chromosome, while males have ZZ sex chromosomes.

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Nature

Oldest known animal sex chromosome evolved in octopuses 380 million years ago

Nature, Published online: 04 March 2024; doi:10.1038/d41586-024-00637-0Result reveals for the first time how some cephalopods determine sex.

2 months ago·United Kingdom

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Live Science

Oldest known sex chromosome emerged 248 million years ago in an octopus ancestor

The oldest-known sex chromosome emerged in octopus and squid between 455 million and 248 million years ago — 180 million years earlier than the previous record-holder, scientists have discovered.

2 months ago·United States

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NewScientist

Earliest known sex chromosomes evolved in octopuses

Genetic analysis of the California two-spot octopus reveals that the species has sex chromosomes, and they may have originated up to 378 million years ago

2 months ago·Baltimore, United States

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IFLScience

Octopuses Already Had The Oldest Known Sex Chromosomes 248 Million Years Ago

When you’re onto a good thing, stick to it.

2 months ago

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spektrum.de

Sex evolution: octopuses have oldest sex chromosome

In fact, sex chromosomes are evolutionarily unstable. But in octopuses, a piece of genetic material has been regulating tentacle sex for around 350 million years.

2 months ago·Heidelberg, Germany

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