A combinatorial regulatory signature controls terminal differentiation of the dopaminergic nervous system in C. elegans

Maria Doitsidou, Nuria Flames, Irini Topalidou, Namiko Abe, Terry Felton, Laura Remesal, Tatiana Popovitchenko, Richard Mann, Martin Chalfie, Oliver Hobert

Research output: Contribution to journalArticlepeer-review

Abstract

Terminal differentiation programs in the nervous system are encoded by cis-regulatory elements that control the expression of terminal features of individual neuron types. We decoded the regulatory information that controls the expression of five enzymes and transporters that define the terminal identity of all eight dopaminergic neurons in the nervous system of the Caenorhabditis elegans hermaphrodite. We show that the tightly coordinated, robust expression of these dopaminergic enzymes and transporters ("dopamine pathway") is ensured through a combinatorial cis-regulatory signature that is shared by all dopamine pathway genes. This signature is composed of an Ets domain-binding site, recognized by the previously described AST-1 Ets domain factor, and two distinct types of homeodomain-binding sites that act in a partially redundant manner. Through genetic screens, we identified the sole C. elegans Distalless/Dlx ortholog, ceh-43, as a factor that acts through one of the homeodomain sites to control both induction and maintenance of terminal dopaminergic fate. The second type of homeodomain site is a Pbx-type site, which is recognized in a partially redundant and neuron subtype-specific manner by two Pbx factors, ceh-20 and ceh-40, revealing novel roles of Pbx factors in the context of terminal neuron differentiation. Taken together, we revealed a specific regulatory signature and cognate, terminal selector-type transcription factors that define the entire dopaminergic nervous system of an animal. Dopaminergic neurons in the mouse olfactory bulb express a similar combinatorial transcription factor collective of Ets/Dlx/Pbx factors, suggesting deep phylogenetic conservation of dopaminergic regulatory programs.

Original languageEnglish
Pages (from-to)1391-405
Number of pages15
JournalGenes & Development
Volume27
Issue number12
DOIs
Publication statusPublished - 15 Jun 2013

Keywords

  • Amino Acid Sequence
  • Animals
  • Caenorhabditis elegans
  • Caenorhabditis elegans Proteins
  • Cell Differentiation
  • DNA Mutational Analysis
  • Dopaminergic Neurons
  • Gene Expression Regulation, Developmental
  • Molecular Sequence Data
  • Nervous System
  • Regulatory Elements, Transcriptional
  • Sequence Alignment

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