What is the clinical evidence from this study?

Study design: Other. Intervention: 12 hours of light and 12 hours of darkness (12L:12D) regimen. Primary outcome: Expression of melanopsin genes (Opn4m and Opn4x) and melatonin receptor gene (Mel 1C).

What does this research mean for the field?

The gene expression of the melatonin receptor (Mel 1C) and melanopsins (Opn4m and Opn4x) in Xenopus laevis melanophores is synchronized by the light-dark cycle, with Mel 1C and Opn4m peaking during the dark phase and Opn4x peaking at the onset of light. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

This research investigates how light-dark cycles impact gene expression related to melatonin and melanopsin in Xenopus laevis melanophores.

June 18, 2026Sleep ScienceOpen Access

LIGHT EFFECTS ON MELATONIN RECEPTOR (MEL 1C) AND MELANOPSIN (OPN4M AND OPN4X) GENE EXPRESSION IN Xenopus laevis MELANOPHORE

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Key result

Light-dark cycling synchronizes melatonin receptor and melanopsin gene expression in Xenopus melanophores.

Population

Cultured melanophores of Xenopus laevis

Comparison

12 hours of light and 12 hours of darkness regimen

Design

In vitro laboratory study

Follow-up

24 hours

Authors

LSLR dos SantosUniversidade de Passo Fundo ACAML CastrucciUniversidade de São Paulo

Discussion

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Implication

No clinical implications yet; hypothesis-generating for light-entrained melanopsin and melatonin receptor rhythms in vertebrates.

Key Points

This research investigates how light-dark cycles impact gene expression related to melatonin and melanopsin in Xenopus laevis melanophores.
Quantitative PCR was used to measure mRNA levels of Mel 1C, Opn4m, and Opn4x in melanophores.
Xenopus laevis melanophores were exposed to a 12L:12D light regimen over five days.
RNA was extracted every four hours on the sixth day for RT-PCR and quantitative PCR analysis.
Mel 1C expression increased during the escotophase, peaking at ZT20.
Opn4m showed a similar trend in expression increase during the escotophase.
Opn4x peaked at the onset of light but declined throughout the photophase.

Structured PICO

Population

Cultured melanophores of Xenopus laevis (2x10^6 cells seeded)

Exposure

12 hours of light and 12 hours of darkness (12L:12D) regimen for 5 days

Outcome

Expression of melanopsin genes (Opn4m and Opn4x) and melatonin receptor gene (Mel 1C) measured by quantitative PCRsurrogate

The expression of melatonin receptor and melanopsin genes in Xenopus laevis melanophores is synchronized by the light-dark cycle.

Cite This Study

Santos et al. (2009) studied this question. 12 hours of light and 12 hours of darkness (12L:12D) regimen was evaluated on Expression of melanopsin genes (Opn4m and Opn4x) and melatonin receptor gene (Mel 1C). The expressions of melatonin receptor (Mel 1C) and melanopsin genes (Opn4m and Opn4x) in Xenopus laevis melanophores are synchronized by the light-dark cycle.

synapsesocial.com/papers/6a33cfcf14a9c556e66778ac https://doi.org/10.1055/s-0046-1820622

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LIGHT EFFECTS ON MELATONIN RECEPTOR (MEL 1C) AND MELANOPSIN (OPN4M AND OPN4X) GENE EXPRESSION IN Xenopus laevis MELANOPHORE

Discussion

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Implication

Key Points

Structured PICO

Cite This Study

LIGHT EFFECTS ON MELATONIN RECEPTOR (MEL 1C) AND MELANOPSIN (OPN4M AND OPN4X) GENE EXPRESSION IN Xenopus laevis MELANOPHORE

Discussion

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Implication

Key Points

Structured PICO

Cite This Study

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