Comparative transcriptome analysis reveals conserved branching morphogenesis related genes involved in chamber formation of catfish swimbladder

Yujia Yang, Qiang Fu, Yang Liu, Xiaozhu Wang, Rex Dunham, Shikai Liu, Lisui Bao, Qifan Zeng, Tao Zhou, Ning Li, Zhenkui Qin, Chen Jiang, Dongya Gao, Zhanjiang Liu

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

The swimbladder is an internal gas-filled organ in teleosts. Its major function is to regulate buoyancy. The swimbladder exhibits great variation in size, shape, and number of compartments or chambers among teleosts. However, genomic control of swimbladder variation is unknown. Channel catfish (Ictalurus punctatus), blue catfish (Ictalurus furcatus), and their F1 hybrids of female channel catfish × male blue catfish (C × B hybrid catfish) provide a good model in which to investigate the swimbladder morphology, because channel catfish possess a single-chambered swimbladder, whereas blue catfish possess a bichambered swimbladder; C × B hybrid catfish possess a bichambered swimbladder but with a significantly reduced posterior chamber. Here we determined the transcriptional profiles of swimbladder from channel catfish, blue catfish, and C × B hybrid catfish. We examined their transcriptomes at both the fingerling and adult stages. Through comparative transcriptome analysis, ~4,000 differentially expressed genes (DEGs) were identified. Among these DEGs, members of the Wnt signaling pathway (wnt1, wnt2, nfatc1, rac2), Hedgehog signaling pathway (shh), and growth factors (fgf10, igf-1) were identified. As these genes were known to be important for branching morphogenesis of mammalian lung and of mammary glands, their association with budding of the posterior chamber primordium and progressive development of bichambered swimbladder in fish suggest that these branching morphogenesis-related genes and their functions in branching are evolutionarily conserved across a broad spectrum of species.

Original languageEnglish (US)
Pages (from-to)67-76
Number of pages10
JournalPhysiological Genomics
Volume50
Issue number1
DOIs
StatePublished - Jan 2018

Keywords

  • Branching morphogenesis
  • Catfish
  • Fish
  • Swimbladder
  • Transcriptome

ASJC Scopus subject areas

  • Physiology
  • Genetics

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