Dorsal and snail homologs in leech development

Dev Genes Evol. 2001 Jul;211(7):329-37. doi: 10.1007/s004270100160.


As part of an examination of how developmental mechanisms such as axis specification, cell fate specification, and segmentation have evolved, we have cloned homologs of the Drosophila melanogaster genes dorsal and snail from the glossiphoniid leech Helobdella robusta. Sequences from one dorsal-class gene (Hro-dl) and two snail-class genes (Hro-sna1 and Hro-sna2) were identified. Polyclonal antibodies were raised against the most conserved domains of HRO-DL and HRO-SNA1. Nuclear staining appeared for both proteins in mid-embryogenesis, in mesodermal and ectodermal precursors. During segmentation, segmentally iterated stripes of cells with strong HRO-DL staining appeared. The stripes of HRO-DL staining were first concentrated in the cytoplasm of cells, and later in the nuclei. Around this time, HRO-SNA levels also appeared in nuclei in segmentally iterated stripes. The localization of HRO-DL and HRO-SNA proteins raise the possibility that these genes are part of a conserved genetic pathway that, instead of specifying the dorsoventral axis and the mesoderm as in flies, might play a role in the diversification of cell types within segment primordia during leech development.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Amino Acid Sequence
  • Animals
  • Base Sequence
  • DNA Primers
  • DNA-Binding Proteins / chemistry
  • DNA-Binding Proteins / genetics*
  • DNA-Binding Proteins / metabolism
  • Drosophila Proteins*
  • Embryo, Nonmammalian / metabolism
  • Leeches / embryology
  • Leeches / genetics*
  • Leeches / growth & development*
  • Molecular Sequence Data
  • Nuclear Proteins / chemistry
  • Nuclear Proteins / genetics*
  • Nuclear Proteins / metabolism
  • Phosphoproteins / chemistry
  • Phosphoproteins / genetics*
  • Phosphoproteins / metabolism
  • Sequence Homology, Amino Acid
  • Snail Family Transcription Factors
  • Transcription Factors / chemistry
  • Transcription Factors / genetics*
  • Transcription Factors / metabolism


  • DNA Primers
  • DNA-Binding Proteins
  • Drosophila Proteins
  • Nuclear Proteins
  • Phosphoproteins
  • Snail Family Transcription Factors
  • Transcription Factors
  • dl protein, Drosophila
  • sna protein, Drosophila