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  • Title: Phenotypic analysis of mice carrying human-type MAFB p.Leu239Pro mutation.
    Author: Kanai M, Jeon H, Ojima M, Nishino T, Usui T, Yadav MK, Kulathunga K, Morito N, Takahashi S, Hamada M.
    Journal: Biochem Biophys Res Commun; 2020 Mar 05; 523(2):452-457. PubMed ID: 31882119.
    Abstract:
    The transcription factor, MafB, plays important role in the differentiation and functional maintenance of various cells and tissues, such as the inner ear, kidney podocyte, parathyroid gland, pancreatic islet, and macrophages. The rare heterozygous substitution (p.Leu239Pro) of the DNA binding domain in MAFB is the cause of Focal Segmental Glomerulosclerosis associated with Duane Retraction Syndrome, which is characterized by impaired horizontal eye movement due to cranial nerve maldevelopment in humans. In this research, we generated mice carrying MafB p.Leu239Pro (Mafbmt/mt) and retrieved their tissues for analysis. As a result, we found that the phenotype of Mafbmt/mt mouse was similar to that of the conventional Mafb deficient mouse. This finding suggests that the Leucine residue at 239 in the DNA binding domain plays a key role in MafB function and could contribute to the diagnosis or development of treatment for patients carrying the MafB p.Leu239Pro missense variant.
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