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  • 1.
    Kvarnung, Malin
    et al.
    Karolinska Univ Hosp, Dept Clin Genet, Stockholm, Sweden;Karolinska Inst, Ctr Mol Med, Dept Mol Med & Surg, Stockholm, Sweden.
    Shahsavani, Mansoureh
    Karolinska Inst, Ctr Mol Med, Dept Mol Med & Surg, Stockholm, Sweden;Karolinska Inst, Biomed, Dept Neurosci, Stockholm, Sweden.
    Taylan, Fulya
    Karolinska Inst, Ctr Mol Med, Dept Mol Med & Surg, Stockholm, Sweden.
    Moslem, Mohsen
    Karolinska Inst, Biomed, Dept Neurosci, Stockholm, Sweden.
    Breeuwsma, Nicole
    Karolinska Inst, Biomed, Dept Neurosci, Stockholm, Sweden.
    Laan, Loora
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Immunology, Genetics and Pathology, Medicinsk genetik och genomik. Uppsala University, Science for Life Laboratory, SciLifeLab.
    Schuster, Jens
    Uppsala University, Science for Life Laboratory, SciLifeLab. Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Immunology, Genetics and Pathology, Medicinsk genetik och genomik.
    Jin, Zhe
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Neuroscience, Birnir: Molecular Physiology and Neuroscience.
    Nilsson, Daniel
    Karolinska Univ Hosp, Dept Clin Genet, Stockholm, Sweden;Karolinska Inst, Ctr Mol Med, Dept Mol Med & Surg, Stockholm, Sweden.
    Lieden, Agne
    Karolinska Univ Hosp, Dept Clin Genet, Stockholm, Sweden;Karolinska Inst, Ctr Mol Med, Dept Mol Med & Surg, Stockholm, Sweden.
    Anderlid, Britt-Marie
    Karolinska Univ Hosp, Dept Clin Genet, Stockholm, Sweden;Karolinska Inst, Ctr Mol Med, Dept Mol Med & Surg, Stockholm, Sweden.
    Nordenskjold, Magnus
    Karolinska Univ Hosp, Dept Clin Genet, Stockholm, Sweden;Karolinska Inst, Ctr Mol Med, Dept Mol Med & Surg, Stockholm, Sweden.
    Lundberg, Elisabeth Syk
    Karolinska Univ Hosp, Dept Clin Genet, Stockholm, Sweden;Karolinska Inst, Ctr Mol Med, Dept Mol Med & Surg, Stockholm, Sweden.
    Birnir, Bryndis
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Neuroscience, Birnir: Molecular Physiology and Neuroscience.
    Dahl, Niklas
    Uppsala University, Science for Life Laboratory, SciLifeLab. Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Immunology, Genetics and Pathology, Medicinsk genetik och genomik.
    Nordgren, Ann
    Karolinska Univ Hosp, Dept Clin Genet, Stockholm, Sweden;Karolinska Inst, Ctr Mol Med, Dept Mol Med & Surg, Stockholm, Sweden.
    Lindstrand, Anna
    Karolinska Univ Hosp, Dept Clin Genet, Stockholm, Sweden;Karolinska Inst, Ctr Mol Med, Dept Mol Med & Surg, Stockholm, Sweden.
    Falk, Anna
    Karolinska Inst, Biomed, Dept Neurosci, Stockholm, Sweden.
    Ataxia in Patients With Bi-Allelic NFASC Mutations and Absence of Full-Length NF1862019In: Frontiers in Genetics, ISSN 1664-8021, E-ISSN 1664-8021, Vol. 10, article id 896Article in journal (Refereed)
    Abstract [en]

    The etiology of hereditary ataxia syndromes is heterogeneous, and the mechanisms underlying these disorders are often unknown. Here, we utilized exome sequencing in two siblings with progressive ataxia and muscular weakness and identified a novel homozygous splice mutation (c.3020-1G > A) in neurofascin (NFASC). In RNA extracted from fibroblasts, we showed that the mutation resulted in inframe skipping of exon 26, with a deprived expression of the full-length transcript that corresponds to NFASC isoform NF186. To further investigate the disease mechanisms, we reprogrammed fibroblasts from one affected sibling to induced pluripotent stem cells, directed them to neuroepithelial stem cells and finally differentiated to neurons. In early neurogenesis, differentiating cells with selective depletion of the NF186 isoform showed significantly reduced neurite outgrowth as well as fewer emerging neurites. Furthermore, whole-cell patch-clamp recordings of patient-derived neuronal cells revealed a lower threshold for openings, indicating altered Na+ channel kinetics, suggesting a lower threshold for openings as compared to neuronal cells without the NFASC mutation. Taken together, our results suggest that loss of the full-length NFASC isoform NF186 causes perturbed neurogenesis and impaired neuronal biophysical properties resulting in a novel early-onset autosomal recessive ataxia syndrome.

  • 2.
    Lam, Matti
    et al.
    Karolinska Inst, Dept Neurosci, Stockholm, Sweden.
    Moslem, Mohsen
    Karolinska Inst, Dept Neurosci, Stockholm, Sweden.
    Bryois, Julien
    Karolinska Inst, Dept Med Epidemiol & Biostat, Stockholm, Sweden.
    Pronk, Robin J.
    Karolinska Inst, Dept Neurosci, Stockholm, Sweden.
    Uhlin, Elias
    Karolinska Inst, Dept Neurosci, Stockholm, Sweden.
    Ellström, Ivar Dehnisch
    Karolinska Inst, Dept Med Biochem & Biophys, Stockholm, Sweden.
    Laan, Loora
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Immunology, Genetics and Pathology, Medicinsk genetik och genomik. Uppsala University, Science for Life Laboratory, SciLifeLab.
    Olive, Jessica
    Karolinska Inst, Dept Neurosci, Stockholm, Sweden.
    Morse, Rebecca
    Karolinska Inst, Dept Neurosci, Stockholm, Sweden.
    Rönnholm, Harriet
    Karolinska Inst, Dept Neurosci, Stockholm, Sweden.
    Louhivuori, Lauri
    Karolinska Inst, Dept Med Biochem & Biophys, Stockholm, Sweden.
    Korol, Sergiy V.
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Neuroscience, Birnir: Molecular Physiology and Neuroscience.
    Dahl, Niklas
    Uppsala University, Science for Life Laboratory, SciLifeLab. Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Immunology, Genetics and Pathology, Medicinsk genetik och genomik.
    Uhlén, Per
    Karolinska Inst, Dept Med Biochem & Biophys, Stockholm, Sweden.
    Anderlid, Britt-Marie
    Karolinska Inst, Dept Mol Med & Surg, Stockholm, Sweden.
    Kele, Malin
    Karolinska Inst, Dept Neurosci, Stockholm, Sweden.
    Sullivan, Patrick F.
    Karolinska Inst, Dept Med Epidemiol & Biostat, Stockholm, Sweden.
    Falk, Anna
    Karolinska Inst, Dept Neurosci, Stockholm, Sweden.
    Single cell analysis of autism patient with bi-allelic NRXN1-alpha deletion reveals skewed fate choice in neural progenitors and impaired neuronal functionality2019In: Experimental Cell Research, ISSN 0014-4827, E-ISSN 1090-2422, Vol. 383, no 1, article id UNSP 111469Article in journal (Refereed)
    Abstract [en]

    We generated human iPS derived neural stem cells and differentiated cells from healthy control individuals and an individual with autism spectrum disorder carrying bi-allelic NRXN1-alpha deletion. We investigated the expression of NRXN1-alpha during neural induction and neural differentiation and observed a pivotal role for NRXN1-alpha during early neural induction and neuronal differentiation. Single cell RNA-seq pinpointed neural stem cells carrying NRXN1-alpha deletion shifting towards radial glia-like cell identity and revealed higher proportion of differentiated astroglia. Furthermore, neuronal cells carrying NRXN1-alpha deletion were identified as immature by single cell RNA-seq analysis, displayed significant depression in calcium signaling activity and presented impaired maturation action potential profile in neurons investigated with electrophysiology. Our observations propose NRXN1-alpha plays an important role for the efficient establishment of neural stem cells, in neuronal differentiation and in maturation of functional excitatory neuronal cells.

1 - 2 of 2
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