<unk>  seems to be most prevalent amongst the Jewish population of Iraq. However, a high concentration of one type is found in the Saguenay-Lac-Saint-Jean region of Canada. This suggests that the disease is more frequent in insular areas where there is more likelihood that both parents are carriers, a higher birth rate, and a greater frequency of consanguineous marriages. As all types of<unk>  are known to be genetic diseases and show a recessive inheritance pattern, consanguineous marriages (in which both partners may have inherited the mutation from the same ancestor) increase the chances of having a baby with the condition.
3-Methylglutaconic aciduria
Urocanic aciduria
Hawkinsinuria
Alpha-aminoadipic and alpha-ketoadipic aciduria
Homocystinuria
2-Hydroxyglutaric aciduria
Cystathioninuria
Phenylketonuria