<unk>  occurs in at least 1 of 40,000 live births, though certain populations have much higher rates. In the Saguenay-Lac-Saint-Jean region of central Quebec,<unk>  occurs at a rate of 1 in 2000 newborns.
Leigh syndrome
Tay–Sachs disease
Maroteaux–Lamy syndrome
Coffin–Siris syndrome
Ohtahara syndrome
Nathalie syndrome
Laurence–Moon syndrome
Kosaki overgrowth syndrome