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Journal of Cell Science, Vol 108, Issue 11 3581-3590, Copyright © 1995 by Company of Biologists

JOURNAL ARTICLES

Characterisation of neurofilament protein NF70 mRNA from the gastropod Helix aspersa reveals that neuronal and non-neuronal intermediate filament proteins of cerebral ganglia arise from separate lamin-related genes

J Adjaye, U Plessmann, K Weber and H Dodemont
Max Planck Institute for Biophysical Chemistry, Department of Biochemistry, Goettingen, Germany.

The neuronal cytoplasmic intermediate filament (IF) protein HeNF70 of the gastropod Helix aspersa is identified by sequence analysis of the corresponding 4,600 bp cDNA isolated from a cerebral ganglion cDNA library. HeNF70 shares 60% sequence identity with the neuronal LoNF70 protein of the cephalopod Loligo pealei and only 36% identity with the Helix non-neuronal IF-A protein. All three molluscan IF proteins display the lamin-type extended coil 1b subdomain harbouring six additional heptads and all have long C-terminal sequences with substantial homology to the tail domains of nuclear lamins. The lamin-like tail domains of the two neurofilament proteins share a unique motif comprising 13 residues, which is absent from Helix IF-A and all other known non-neuronal IF proteins. HeNF70 is encoded by a 9.5 kb RNA transcript. The very long 7.2 kb 3'-untranslated sequence contains a unique 26 nucleotide repeat extending over 0.5 kb in its 5'-region. The HeNF70 mRNA is expressed at low abundancy in cerebral ganglia but not in any of the 13 non-neuronal tissues tested. In contrast, all tissues express at fairly high levels the same 4.6 and 4.2 kb mRNAs encoding the Helix non-neuronal IF-A/B proteins. Blot hybridisation studies on genomic DNA and ganglion mRNA with subprobes from the cloned HeNF70 cDNA, as well as sequence analysis of an RT-PCR generated partial cDNA encoding a putative HeNF60 protein, indicate at least two different neuronal IF genes in Helix.


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D Riemer and K Weber
Common and variant properties of intermediate filament proteins from lower chordates and vertebrates; two proteins from the tunicate Styela and the identification of a type III homologue
J. Cell Sci., January 10, 1998; 111(19): 2967 - 2975.
[Abstract] [PDF]


© The Company of Biologists Ltd 1995