The homeoproteins MAB-18 and CEH-14 insulate the dauer collagen gene col-43 from activation by the adjacent promoter of the spermatheca gene sth-1 in Caenorhabditis elegans

Tetsuya Bando, Tatsuji Ikeda, Hiroaki Kagawa

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Genome searches in this study indicate that the nematode Caenorhabditis elegans genome has 2582 bidirectionally oriented genes that account for more than 25% of the total genes. We analyze the transcriptional repression system for one of these predicted bidirectional promoters, which controls the expression of the spermathecal gene sth-1 and collagen gene col-43. These two genes are separated by 1.3 kb and are transcribed bidirectionally. sth-1 is expressed in spermatheca after the L4 stage and col-43 is expressed in the hypodermal cells of the L2d dauer stage. The upstream regions required for the expression of sth-1 and col-43 shared an overlapped control sequence. Two homeoproteins, MAB-18 and CEH-14, were isolated by yeast one-hybrid screening as binding proteins of the overlapped region. MAB-18 bound to two homeodomain-binding sites and interacted with CEH-14 to repress col-43 expression in spermatheca. These results indicate that the two homeoproteins interact with each other to repress col-43 expression in sth-1-expressing tissues. This is the first report of bidirectional gene regulation analysis in the C. elegans genome.

Original languageEnglish
Pages (from-to)101-112
Number of pages12
JournalJournal of Molecular Biology
Volume348
Issue number1
DOIs
Publication statusPublished - Apr 22 2005

Keywords

  • Bidirectional promoter
  • CEH-14
  • Caenorhabditis briggsae
  • Caenorhabditis elegans
  • MAB-18

ASJC Scopus subject areas

  • Structural Biology
  • Molecular Biology

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