Conservation and expression of IQ-domain-containing calpacitin gene products (neuromodulin/GAP-43, neurogranin/RC3) in the adult and developing oscine song control system.
Dev Neurobiol
; 69(2-3): 124-40, 2009.
Article
in En
| MEDLINE
| ID: mdl-19023859
ABSTRACT
Songbirds are appreciated for the insights they provide into regulated neural plasticity. Here, we describe the comparative analysis and brain expression of two gene sequences encoding probable regulators of synaptic plasticity in songbirds neuromodulin (GAP-43) and neurogranin (RC3). Both are members of the calpacitin family and share a distinctive conserved core domain that mediates interactions between calcium, calmodulin, and protein kinase C signaling pathways. Comparative sequence analysis is consistent with known phylogenetic relationships, with songbirds most closely related to chicken and progressively more distant from mammals and fish. The C-terminus of neurogranin is different in birds and mammals, and antibodies to the protein reveal high expression in adult zebra finches in cerebellar Purkinje cells, which has not been observed in other species. RNAs for both proteins are generally abundant in the telencephalon yet markedly reduced in certain nuclei of the song control system in adult canaries and zebra finches neuromodulin RNA is very low in RA and HVC (relative to the surrounding pallial areas), whereas neurogranin RNA is conspicuously low in Area X (relative to surrounding striatum). In both cases, this selective downregulation develops in the zebra finch during the juvenile song learning period, 25-45 days after hatching. These results suggest molecular parallels to the robust stability of the adult avian song control circuit.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Vocalization, Animal
/
Gene Expression Regulation, Developmental
/
GAP-43 Protein
/
Neurogranin
/
High Vocal Center
Limits:
Animals
Language:
En
Journal:
Dev Neurobiol
Journal subject:
BIOLOGIA
/
NEUROLOGIA
Year:
2009
Document type:
Article
Affiliation country:
United States