Green light irradiation during sex differentiation induces female-to-male sex reversal in the medaka Oryzias latipes

Scientific Reports
Oki HayasakaTomonari Kotani

Abstract

This study investigated whether irradiation of a specific light wavelength could affect the sex differentiation of fish. We first found that the photoreceptor genes responsible for receiving red, green, and ultraviolet light were expressed in the eyes of medaka during the sex differentiation period. Second, we revealed that testes developed in 15.9% of genotypic females reared under green light irradiation. These female-to-male sex-reversed fish (i.e. neo-males) showed male-specific secondary sexual characteristics and produced motile sperm. Finally, progeny tests using the sperm of neo-males (XX) and eggs of normal females (XX) revealed that all F1 offspring were female, indicating for the first time in animals that irradiation with light of a specific wavelength can trigger sex reversal.

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Feb 7, 2020·Biological Reviews of the Cambridge Philosophical Society·Meghan A CastelliClare E Holleley
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Nov 13, 2020·Physiological Reviews·Yoshitaka NagahamaMasaru Nakamura

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Methods Mentioned

BETA
PCR
genotyping
irradiate

Software Mentioned

SAS
Stat View

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