Expression of the gene for ancestral glycoprotein hormone β subunit in the nerve cord of amphioxus

Yukiko Tando, Kaoru Kubokawa

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Amphioxus belongs to the subphylum cephalochordata, a clade of chordates phylogenetically placed at the most basal position. Despite many studies on the endocrine system of amphioxus, there were no confident lines of evidence on the presence of pituitary hormones, whereas recent amphioxus genome analysis reported that amphioxus has no pituitary hormone except for thyrostimulin, which is a glycoprotein hormone in the pituitary, brain, and other organs of vertebrates. In the present study, we cloned cDNA for one glycoprotein hormone β subunit (GPB) from amphioxus, AmpGPB5, and phylogenetically indicated that AmpGPB5 is the ancestral molecule of glycoprotein hormone β subunits of vertebrates including pituitary glycoprotein hormones. Synteny analyses showed conservation of chromosomal location of genes near GPB genes from amphioxus through human. The AmpGPB5 gene was expressed in a restricted region of the dorsal part of the nerve cord, glandular atrial cells of gills, and pre-vitellogenic oocytes in amphioxus. However, expression was not detected in the Hatschek's pit which is considered to be a primitive pituitary gland. On the basis of present results, we hypothesize that a portion of vertebrate pituitary hormones might be derived from an ancestral glycoprotein hormone of amphioxus that functions as a neuroendocrine hormone.

Original languageEnglish
Pages (from-to)329-339
Number of pages11
JournalGeneral and Comparative Endocrinology
Volume162
Issue number3
DOIs
Publication statusPublished - 2009 Jul

Keywords

  • Branchiostoma belcheri
  • Evolution
  • Gene expression
  • Glycoprotein hormone
  • Neuroendocrinology

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Endocrinology

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