The mapped polyneuropathy interval on CFA 13 contained a compelling functional candidate gene, NDRG1. This gene is known to be implicated in recessive inherited human Charcot-Marie-Tooth disease type 4D (CMT4D; hereditary motor and sensory neuropathy-Lom) [21]. Here, NDRG1 is linked to Charcot-Marie-Tooth disease type 4D.