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Strong Support
mechanistic
Analysis v3
History

In mice lacking the KLHL1 gene, increased levels of CaV3.1 T-type ion channels cause a sustained electrical current at rest, which triggers irregular bursts of activity in POMC neurons and shifts...

17
Pro
0
Against

Mechanism

Synthesis from 1 study

How it works

Without KLHL1, too many calcium channels open in hunger neurons, letting in constant calcium that pushes the cell's voltage up. This makes the neurons fire randomly and ignore signals that should calm them down.

Most probable mechanism

In Simple Terms

When the KLHL1 protein is absent, calcium channels called CaV3.1 multiply in hunger-regulating brain cells. These extra channels open more easily and stay open longer at normal resting voltage, letting in too much calcium. This constant calcium influx pushes the cell's electrical charge upward, making it overly excited and causing it to fire random bursts of signals. Because the cell is already maxed out, it can no longer respond to signals that normally tell it to slow down.

Causal chain
1

Loss of KLHL1 protein removes its inhibitory regulation of CaV3.1 T-type calcium channels

Verified by multiple studies
which leads to
2

CaV3.1 channel expression increases significantly in hypothalamic POMC neurons

Verified by multiple studies
which leads to
3

Increased CaV3.1 expression alters channel biophysics, shifting voltage dependence of activation and inactivation to more negative potentials

Verified by multiple studies
which leads to
4

The shifted voltage dependence expands the T-type window current at resting membrane potential, enabling sustained calcium influx

Verified by multiple studies
which leads to
5

Sustained calcium influx through the expanded window current depolarizes the resting membrane potential of POMC neurons

Verified by multiple studies
which leads to
6

Depolarized resting potential brings neurons closer to firing threshold, triggering spontaneous burst firing

Verified by multiple studies

Evidence from Studies

Supporting (1)

17

Community contributions welcome

17

Genetic Deletion of KLHL1 Leads to Hyperexcitability in Hypothalamic POMC Neurons and Lack of Electrical Responses to Leptin

Case-Control Study
Animal & In Vitro
2021

Contradicting (0)

0

Community contributions welcome

No contradicting evidence found

Gold Standard Evidence Needed

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Source Study

Genetic Deletion of KLHL1 Leads to Hyperexcitability in Hypothalamic POMC Neurons and Lack of Electrical Responses to Leptin

Score: 17
DOI: 10.3389/fnins.2021.718464

Similar Assertions

In mice lacking the KLHL1 gene, increased levels of CaV3.1 calcium channels in specific brain neurons lead to a 40% higher baseline calcium current, a shift in channel activation to more negative voltages, and a 2.3-fold increase in calcium entry at rest.

17
0
85%

When CaV3.1 T-type calcium channels are overexpressed in specific hypothalamic neurons, these neurons become more active at rest and fail to respond to leptin, even though the leptin receptors and signaling pathways function normally.

17
0
72%

In mice, removing the KLHL1 gene results in higher levels of CaV3.1 calcium channels in specific brain neurons that regulate energy balance, which increases their baseline activity and reduces their response to leptin, leading to obesity.

17
0
70%