Chlamydomonas DIP13 and Human NA14: A New Class of Proteins Associated With Microtubule Structures Is Involved in Cell Division

J Cell Sci. 2003 Apr 15;116(Pt 8):1449-62. doi: 10.1242/jcs.00337.


We have cloned and characterized a single copy C. reinhardtii gene containing an open reading frame of 333 nucleotides encoding a 12.7 kDa protein. The novel protein, DIP13, exhibits 60% identity with two mammalian proteins, human NA14 and an unnamed mouse protein. Homologous sequences are also present in several protozoan, trematode and fish genomes, but no homologs have been found in the completed genomes of yeast, Drosophila, C. elegans and A. thaliana. By using a specific antibody we have localized DIP13 to microtubule structures, namely basal bodies, flagellar axonemes and cytoplasmic microtubules. Anti-DIP13 antibody also specifically recognized human NA14 by immunofluorescence and stained basal bodies and flagella of human sperm cells as well as the centrosome of HeLa cells. Expression of the DIP13 open reading frame in antisense orientation in Chlamydomonas resulted in multinucleate, multiflagellate cells, which suggests a role for this protein in ensuring proper cell division. Thus, DIP13/NA14 could represent the founding members of a new class of highly conserved proteins that are associated with microtubule structures.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Algal Proteins / genetics*
  • Algal Proteins / metabolism
  • Amino Acid Sequence
  • Animals
  • Autoantigens / genetics*
  • Autoantigens / metabolism
  • COS Cells
  • Cell Division / physiology
  • Chlamydomonas reinhardtii / cytology
  • Chlamydomonas reinhardtii / genetics*
  • Chlamydomonas reinhardtii / metabolism
  • Chlorocebus aethiops
  • Chromosome Mapping
  • Flagella / metabolism
  • Flagella / ultrastructure
  • HeLa Cells
  • Humans
  • Male
  • Mice
  • Microscopy, Electron
  • Microtubule-Associated Proteins / genetics*
  • Microtubule-Associated Proteins / metabolism
  • Microtubules / metabolism*
  • Molecular Sequence Data
  • Nuclear Proteins / genetics*
  • Nuclear Proteins / metabolism
  • RNA, Antisense / genetics
  • Sequence Analysis, Protein
  • Sequence Homology, Amino Acid
  • Sperm Tail / metabolism


  • Algal Proteins
  • Autoantigens
  • Microtubule-Associated Proteins
  • NA14 nuclear autoantigen
  • Nuclear Proteins
  • RNA, Antisense

Associated data

  • GENBANK/AF131736