title: Expression analysis of the CLCA gene family in mouse and human with emphasis on the nervous system.
abstract: BACKGROUND
  Members of the calcium-activated chloride channel (CLCA) gene family have been suggested to possess a variety of functions including cell adhesion and tumor suppression. Expression of CLCA family members has mostly been analyzed in non-neural tissues. Here we describe the expression of mouse and human CLCA genes in the nervous system.
  
  
  RESULTS
  We show that from the six mouse CLCA family members only Clca1, Clca2 and Clca4 mRNAs are expressed in the adult brain, predominantly in olfactory ensheathing cells. During mouse nervous system development Clca1/2 is more widely expressed, particularly in cranial nerves, the diencephalon and in the cerebral cortex. While human CLCA2 and CLCA4 genes are widely expressed in brain, and at particularly high levels in the optic nerve, human CLCA3, the closest homologue of mouse Clca1, Clca2 and Clca4, is not expressed in the brain. Furthermore, we characterize the expression pattern of mouse Clca1/2 genes during embryonic development by in situ hybridization.
  
  
  CONCLUSIONS
  The data published in this article indicate that within the nervous system mouse Clca1/2 genes are highly expressed in the cells ensheathing cranial nerves. Human CLCA2 and CLCA4 mRNAs are expressed at high level in optic nerve. High level expression of CLCA family members in mouse and human glial cells ensheathing nerves suggests a specific role for CLCA proteins in the development and homeostasis of these cells.
authors.affiliation: Department of Gene Technology, Tallinn University of Technology, Akadeemia tee 15, Tallinn 19086, Estonia. marko.piirsoo@ttu.ee
authors.forename: Marko
authors.initials: M
authors.lastname: Piirsoo
authors.forename: Dies
authors.initials: D
authors.lastname: Meijer
authors.forename: Tõnis
authors.initials: T
authors.lastname: Timmusk
mesh_terms: D000328:Adult; D000818:Animals; D001483:Base Sequence; D018118:Chloride Channels / Q000145:classification / Q000235:genetics*; D017931:DNA Primers / Q000235:genetics; D018507:Gene Expression Regulation, Developmental; D006801:Humans; D017403:In Situ Hybridization; D051379:Mice; D005810:Multigene Family; D009420:Nervous System / Q000196:embryology / Q000254:growth & development / Q000378:metabolism*; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013045:Species Specificity
chemical_list: D018118:Chloride Channels; D017931:DNA Primers; D012333:RNA, Messenger