Neonatal-onset Progressive Familial Intrahepatic Cholestasis (PFIC): first molecular study in Tunisian patients.

Progressive familial intrahepatic is a heterogeneous group of rare autosomal recessive liver disorders. Neonatal onset is characteristic of the PFIC 1 and PFIC 2, which result from mutations in genes respectivelyATP8B1 and ABCB11. Four Tunisian patients, three of them with PFIC 2 and one with PFIC1, were described. They all had typical clinical and biological features. However, they all had newly reported mutations. The same mutation was found in the patients with PFIC2, which could facilitate the diagnosis in Tunisian patients suspected in the future. The patient diagnosed with PFIC1 had also a newly described mutation, with a probable phenotypic particularity that is congenital hypothyroidism. Advances are being made to establish a molecular diagnosis in neonatal onset cholestasis. Indeed, next generation sequencing gene panels (NGSGP) potentially decrease the need for invasive procedures in these patients, enable early initiation of treatment and adequate genetic counseling.