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Polygraphic Recording Procedure for Measuring Sleep in Mice

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Published on: January 25, 2016

Melatonin receptor genes in vertebrates.

Di Yan Li¹, David Glenn Smith, Rüdiger Hardeland

¹College of Animal Science and Technology, Sichuan Agricultural University, Ya'an 625014, China. zhuqing5959@163.com.

International Journal of Molecular Sciences

|May 29, 2013

Summary

Melatonin receptors, part of the G protein-coupled receptor family, play key roles in circadian rhythms and neural processes. Gene studies reveal mutations linked to diseases, with GPR50 identified as an evolutionary outgroup.

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Area of Science:

* Endocrinology and Molecular Biology
* Neuroscience and Chronobiology

Background:

* Melatonin receptors are G protein-coupled receptors (GPCRs) crucial for mediating the effects of the hormone melatonin.
* Key subtypes include MT1 (MTNR1A) and MT2 (MTNR1B) in mammals, Mel1c (MTNR1C) in non-mammals, and the non-ligand-binding GPR50 in mammals.
* Melatonin, secreted by the pineal gland, regulates circadian rhythms, particularly via the suprachiasmatic nucleus.

Purpose of the Study:

* To review recent research on the gene organization, expression, evolution, and mutations of melatonin receptor genes in vertebrates.
* To analyze the evolutionary relationships among melatonin receptor genes and related orphan receptors.
* To highlight the association between gene polymorphisms and various diseases and disorders.

Main Methods:

* Review of existing literature on melatonin receptor gene studies.
* Phylogenetic analysis of melatonin receptor gene sequences.
* Examination of gene organization, expression patterns, and identified mutations.

Main Results:

* Identified three main melatonin receptor subtypes (MT1, MT2, Mel1c) and the related orphan receptor GPR50 across vertebrate species.
* Phylogenetic analysis positions GPR50 as an outgroup, suggesting an early divergence from the melatonin receptor lineage.
* Numerous gene polymorphisms in melatonin receptors are associated with various diseases and disorders.

Conclusions:

* Melatonin receptor gene evolution is complex, with GPR50 representing an anciently diverged relative.
* Understanding melatonin receptor genetics is vital for comprehending circadian regulation and associated pathologies.
* Further research into melatonin receptor gene mutations can illuminate disease mechanisms and potential therapeutic targets.