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Genes Cells December 1, 2018; 23 (12): 998-1008.

Developmental gene expression patterns in the brain and liver of Xenopus tropicalis during metamorphosis climax.

Thyroid hormones (THs) induce metamorphosis in amphibians, causing dynamic changes, whereas mammalian newborns undergo environmental transition from placenta to open air at birth. The similarity between amphibian metamorphosis and the mammalian perinatal periods has been repeatedly discussed. However, a corresponding developmental gene expression analysis has not yet been reported. In this study, we examined the developmental gene expression profiles in the brain and liver of Xenopus tropicalis during metamorphosis climax and compared them to the respective gene expression profiles of newborn rodents. Many upregulated genes identified in the tadpole brain during metamorphosis are also upregulated in the rodent brain during the first three postnatal weeks when the TH surge occurs. The upregulation of some genes in the brain was inhibited in thyroid hormone receptor α (TRα) knockout tadpoles but not in TRβ-knockout tadpoles, implying that brain metamorphosis is mainly mediated by TRα. The expression of some genes was also increased in the liver during metamorphosis climax. Our data suggest that the rodent brain undergoes TH-dependent remodeling during the first three postnatal weeks as observed in X. tropicalis during the larva-to-adult metamorphosis.

PubMed ID: 30294949
Article link: Genes Cells
Grant support: [+]
Genes referenced: slc12a5 atp1b3 nefl scn4b mbp syt2 kcnj10 tubb3 atp1a2 nefm mag loc100488132 nectin3 nectin1 dlg4 cadm3 cadm1 cdh2 thrb alb arg1 ass1 otc cps1 thra cadm2
GO Terms: metamorphosis

Article Images: [+] show captions

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