Identification of two novel genes specifically expressed in the D-group neurons of the terrestrial snail CNS |
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Authors: | Yu D Bogdanov P M Balaban I S Zakharov D A Poteryaev A V Belyavsky |
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Institution: | (1) Engelhardt Institute of Molecular Biology, Vavilov str. 32, 117984 Moscow, Russia;(2) Institute of Higher Nervous Activity and Neurophysiology, Butlerova str. 5A, 117865 Moscow, Russia |
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Abstract: | A search for genes specifically expressed in the giant interneurons of parietal ganglia of the snailHelix lucorum yielded, among others, two genes named HDS1 and HDS2. According to data obtained by Northern hybridization and whole-mountin situ hybridization, both genes are neurospecific and expressed almost exclusively in the peptidergic D-group neurons (Sakharov,
1974) located in the right parietal ganglion.In situ hybridization of the HDS1 and HDS2 probes with CNS of several related species of the Helicoidea superfamily identified in
all cases similarly located homologous groups of neurons. Sequencing of the near full-length cDNA copies of the HDS1 and HDS2
genes revealed open reading frames 107 and 102 amino acids long for HDS1 and HDS2, respectively. Both putative proteins contain
a hydrophobic leader peptide and putative recognition sites for furin-like and PC-like endopeptidases. Predicted amino acid
sequences of the HDS1 and HDS2 proteins were found to be moderately homologous to each other, as well as to the LYCP preprohormone
expressed by the light yellow cells of the freshwater snailLymnaea stagnalis. These results confirm an earlier hypothesis that the D-group of theHelix family and the light yellow cells ofLymnaea stagnalis represent homologous neuronal groups. Our data suggest that the HDS1 and HDS2 genes encode precursors of secreted molecules,
most likely neuropeptides or neurohormones. |
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Keywords: | neuropeptides subtractive cloning in situ hybridization peptidergic neurons D-group Helix |
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