|Dr. Ferrer, UBC.|
Eight other genes can contribute.
Added: Loss of dopamine in a small group of brain cells that time movement triggers Parkinsons symptoms in mice. There are two types of "medium spiny neurons" (MSN) that act as "gas pedal and brake" which are fed by "fast spiking neurons" (FSN). When dopamine is depleted, FSN nerves begin to rewire and preferentially supply signals to one type of MSN with tremors following.