COMMENT
**************************************************
File generated by: neuroConstruct v1.5.1
**************************************************
This file holds the implementation in NEURON of the Cell Mechanism:
H_CA1pyr_prox (Type: Channel mechanism, Model: ChannelML based process)
with parameters:
/channelml/@units = SI Units
/channelml/notes = ChannelML file containing a single Channel description
/channelml/channel_type/@name = H_CA1pyr_prox
/channelml/channel_type/status/@value = stable
/channelml/channel_type/status/comment = Equations adapted from Kali
/channelml/channel_type/status/contributor/name = Szoke Boglarka
/channelml/channel_type/notes = Hiperpolarization activated channel in CA1 pyramid cell
/channelml/channel_type/authorList/modelTranslator/name = Szoke Boglarka
/channelml/channel_type/authorList/modelTranslator/institution = PPKE-ITK
/channelml/channel_type/authorList/modelTranslator/email = szoboce - at - digitus.itk.ppke.hu
/channelml/channel_type/current_voltage_relation/@cond_law = ohmic
/channelml/channel_type/current_voltage_relation/@default_gmax = 0.35
/channelml/channel_type/current_voltage_relation/@default_erev = -0.030
/channelml/channel_type/current_voltage_relation/gate/@name = X
/channelml/channel_type/current_voltage_relation/gate/@instances = 1
/channelml/channel_type/current_voltage_relation/gate/closed_state/@id = X0
/channelml/channel_type/current_voltage_relation/gate/open_state/@id = X
/channelml/channel_type/current_voltage_relation/gate/time_course/@name = tau
/channelml/channel_type/current_voltage_relation/gate/time_course/@from = X0
/channelml/channel_type/current_voltage_relation/gate/time_course/@to = X
/channelml/channel_type/current_voltage_relation/gate/time_course/@expr_form = generic
/channelml/channel_type/current_voltage_relation/gate/time_course/@expr = (exp (33.0 * (v + 0.075))) / (11.0 * (1 + (exp (83.0* (v + 0.075)))))
/channelml/channel_type/current_voltage_relation/gate/steady_state/@name = inf
/channelml/channel_type/current_voltage_relation/gate/steady_state/@from = X0
/channelml/channel_type/current_voltage_relation/gate/steady_state/@to = X
/channelml/channel_type/current_voltage_relation/gate/steady_state/@expr_form = generic
/channelml/channel_type/current_voltage_relation/gate/steady_state/@expr = 1 / (1 + (exp (300*(v + 0.083))))
/channelml/channel_type/impl_prefs/table_settings/@max_v = 0.05
/channelml/channel_type/impl_prefs/table_settings/@min_v = -0.1
/channelml/channel_type/impl_prefs/table_settings/@table_divisions = 3000
// File from which this was generated: /home/kali/nC_projects/CA1_NEURON/cellMechanisms/H_CA1pyr_prox/H_CA1pyr_prox.xml
// XSL file with mapping to simulator: /home/kali/nC_projects/CA1_NEURON/cellMechanisms/H_CA1pyr_prox/ChannelML_v1.8.1_NEURONmod.xsl
ENDCOMMENT
? This is a NEURON mod file generated from a ChannelML file
? Unit system of original ChannelML file: SI Units
COMMENT
ChannelML file containing a single Channel description
ENDCOMMENT
TITLE Channel: H_2comp_rate
COMMENT
Hiperpolarization activated channel in CA1 pyramid cell
ENDCOMMENT
UNITS {
(mA) = (milliamp)
(mV) = (millivolt)
(S) = (siemens)
(um) = (micrometer)
(molar) = (1/liter)
(mM) = (millimolar)
(l) = (liter)
}
NEURON {
SUFFIX H_2comp_rate
RANGE e
NONSPECIFIC_CURRENT i
RANGE gmax, gion, fastRate
RANGE Xinf, Xtau1, Xtau2
}
PARAMETER {
gmax = 0.000035 (S/cm2) ? default value, should be overwritten when conductance placed on cell
e = -30 (mV) ? default value, should be overwritten when conductance placed on cell
fastRate = 0.6 ()
}
ASSIGNED {
v (mV)
i (mA/cm2)
celsius (degC)
gion (S/cm2)
Xinf
Xtau1 (ms)
Xtau2 (ms)
}
BREAKPOINT {
SOLVE states METHOD cnexp
gion = fastRate*gmax*((X1)^1 ) + (1-fastRate)*gmax*((X2)^1 )
i = gion*(v - e)
}
INITIAL {
rates(v)
X1 = Xinf
X2 = Xinf
}
STATE {
X1
X2
}
DERIVATIVE states {
rates(v)
X1' = (Xinf - X1)/Xtau1
X2' = (Xinf - X2)/Xtau2
}
PROCEDURE rates(v(mV)) {
? Note: not all of these may be used, depending on the form of rate equations
LOCAL alpha, beta, tau1, tau2, inf, gamma, zeta, temp_adj_X, A_tau_X, B_tau_X, Vhalf_tau_X, A_inf_X, B_inf_X, Vhalf_inf_X
TABLE Xinf, Xtau1, Xtau2
DEPEND celsius
FROM -100 TO 50 WITH 3000
UNITSOFF
temp_adj_X = 1
? *** Adding rate equations for gate: X ***
? Found a generic form of the rate equation for tau, using expression: (exp (33.0 * (v + 0.075))) / (11.0 * (1 + (exp (83.0* (v + 0.075)))))
? Note: Equation (and all ChannelML file values) in SI Units so need to convert v first...
v = v * 0.0010 ? temporarily set v to units of equation...
? tau = 1 / ( (3.259 * (exp (0.1617 * (v + 0.0977) / 0.0089))) + (3.259 * (exp ((0.1617 - 1) * (v + 0.0977) / 0.0089)))) + 0.05621
tau1 = 1 / ( (11.93 * (exp (0.6056 * (v + 0.0977) / 0.0089))) + (11.93 * (exp ((0.6056 - 1) * (v + 0.0977) / 0.0089))))
tau2 = 1 / ( (1.839 * (exp (0.2069 * (v + 0.0977) / 0.0089))) + (1.839 * (exp ((0.2069 - 1) * (v + 0.0977) / 0.0089)))) + 0.09549
? Set correct units of tau for NEURON
tau1 = tau1 * 1000
tau2 = tau2 * 1000
v = v * 1000 ? reset v
Xtau1 = tau1/temp_adj_X
Xtau2 = tau2/temp_adj_X
? Found a generic form of the rate equation for inf, using expression: 1 / (1 + (exp (300*(v + 0.083))))
? Note: Equation (and all ChannelML file values) in SI Units so need to convert v first...
v = v * 0.0010 ? temporarily set v to units of equation...
inf = 1 / (1 + (exp ((v + 0.0977)/0.0089)))
v = v * 1000 ? reset v
Xinf = inf
? *** Finished rate equations for gate: X ***
}
UNITSON