Alternating Hemiplegia of Childhood 1, also known as ahc1, is related to alternating hemiplegia of childhood 2. An important gene associated with Alternating Hemiplegia of Childhood 1 is ATP1A2 (ATPase Na+/K+ Transporting Subunit Alpha 2). Affiliated tissues include eye and brain, and related phenotypes are episodic hemiplegia and episodic quadriplegia