BALB.NCT- is a unique mouse model of hereditary coproporphyria.

In humans, mutations in the coproporphyrinogen oxidase () gene can result in hereditary coproporphyria (HCP), characterized by high levels of coproporphyrin excretion in the urine and feces, as well as acute neurovisceral and chronic cutaneous manifestations. Appropriate animal models for comprehending the precise pathogenesis mechanism of HCP have not been reported that show similarities in terms of gene mutation, reduced CPOX activity, excess coproporphyrin accumulation, and clinical symptoms. As previously discovered, the BALB.NCT- mouse carries a hypomorphic mutation in the gene. Due to the mutation, BALB.NCT- had a drastic increase in coproporphyrin in the blood and liver persistently from a young age. In this study, we found that BALB.NCT- mice manifested HCP symptoms. Similar to HCP patients, BALB.NCT- excreted an excessive amount of coproporphyrin and porphyrin precursors in the urine and displayed neuromuscular symptoms, such as a lack of grip strength and impaired motor coordination. Male BALB.NCT- had nonalcoholic steatohepatitis (NASH)-like liver pathology and sclerodermatous skin pathology. A portion of male mice had liver tumors as well, whereas female BALB.NCT- lacked these hepatic and cutaneous pathologies. In addition, we discovered that BALB.NCT- exhibited microcytic anemia. These results indicate that BALB.NCT- mice serve as the suitable animal model to help gain insight into the pathogenesis and therapy of HCP.