Midline Fasciclin: a Drosophila Fasciclin-I-related membrane protein localized to the CNS midline cells and trachea

J Neurobiol. 1998 Apr;35(1):77-93. doi: 10.1002/(sici)1097-4695(199804)35:1<77::aid-neu7>3.0.co;2-8.


Drosophila Fasciclin I is the prototype of a family of vertebrate and invertebrate proteins that mediate cell adhesion and signaling. The midline fasciclin gene encodes a second Drosophila member of the Fasciclin I family. Midline Fasciclin largely consists of four 150 amino acid repeats characteristic of the Fasciclin I family of proteins. Immunostaining and biochemical analysis using Midline Fasciclin antibodies indicates that it is a membrane-associated protein, although the sequence does not reveal a transmembrane domain. The gene is expressed in a dynamic fashion during embryogenesis in the blastoderm, central nervous system midline cells, and trachea, suggesting it plays multiple developmental roles. Protein localization studies indicate that Midline Fasciclin is found within cell bodies of midline neurons and glia, and on midline axons. Initial cellular analysis of a midline fasciclin loss-of-function mutation reveals only weak defects in axonogenesis. However, embryos mutant for both midline fasciclin and the abelson nonreceptor tyrosine kinase, show more severe defects in axonogenesis that resemble fasciclin I abelson double mutant phenotypes.

Publication types

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

MeSH terms

  • Amino Acid Sequence
  • Animals
  • Axons / physiology
  • Blastoderm / metabolism
  • Cell Adhesion Molecules, Neuronal / genetics
  • Cell Adhesion Molecules, Neuronal / metabolism*
  • Cell Membrane / metabolism
  • Central Nervous System / cytology
  • Central Nervous System / metabolism*
  • Cloning, Molecular
  • Drosophila / embryology
  • Drosophila / metabolism*
  • Gastrula / metabolism
  • Gene Deletion
  • Immunohistochemistry
  • Molecular Sequence Data
  • Mutation / physiology
  • Protein-Tyrosine Kinases / genetics
  • Sequence Homology, Amino Acid
  • Trachea / cytology
  • Trachea / metabolism


  • Cell Adhesion Molecules, Neuronal
  • fasciclin I
  • Protein-Tyrosine Kinases