Abstract:
:Postembryonic developmental changes in electrophysiological properties of the AIY interneuron class were investigated using whole cell voltage clamp. AIY interneurons displayed an increase in cell capacitance during larval development, whereas steady-state current amplitude did not increase. The time course of the outward membrane current, carried at least in part by K+ ions, matured, from a slowly activating, sustained current to a rapidly activating, decaying current. We also investigated how the development of capacitance and outward current was altered by loss-of-function mutations in genes expressed in AIY. One such gene, the LIM homeobox gene ttx-3, is known to be involved in the specification of the AIY neuronal subtype. In ttx-3 mutants, capacitance and outward current matured precociously. In mutants of the gene wrk-1, an immunoglobulin superfamily (IgSF) member whose expression is regulated by ttx-3, capacitance matured normally, whereas outward current matured precociously. We conclude that AIY interneurons contain distinct pathways for regulating capacitance and membrane current.
journal_name
J Neurophysioljournal_title
Journal of neurophysiologyauthors
Faumont S,Boulin T,Hobert O,Lockery SRdoi
10.1152/jn.00052.2006subject
Has Abstractpub_date
2006-06-01 00:00:00pages
3665-73issue
6eissn
0022-3077issn
1522-1598pii
00052.2006journal_volume
95pub_type
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