In utero gene therapy rescues microcephaly caused by Pqbp1-hypofunction in neural stem progenitor cells

H. Ito, H. Shiwaku, C. Yoshida, H. Homma, H. Luo, X. Chen, K. Fujita, L. Musante, U. Fischer, S. G M Frints, C. Romano, Y. Ikeuchi, T. Shimamura, S. Imoto, S. Miyano, S. I. Muramatsu, T. Kawauchi, M. Hoshino, M. Sudol, A. ArumughanE. E. Wanker, T. Rich, C. Schwartz, F. Matsuzaki, A. Bonni, V. M. Kalscheuer, H. Okazawa

Research output: Contribution to journalArticlepeer-review

Abstract

Human mutations in PQBP1, a molecule involved in transcription and splicing, result in a reduced but architecturally normal brain. Examination of a conditional Pqbp1-knockout (cKO) mouse with microcephaly failed to reveal either abnormal centrosomes or mitotic spindles, increased neurogenesis from the neural stem progenitor cell (NSPC) pool or increased cell death in vivo. Instead, we observed an increase in the length of the cell cycle, particularly for the M phase in NSPCs. Corresponding to the developmental expression of Pqbp1, the stem cell pool in vivo was decreased at E10 and remained at a low level during neurogenesis (E15) in Pqbp1-cKO mice. The expression profiles of NSPCs derived from the cKO mouse revealed significant changes in gene groups that control the M phase, including anaphase-promoting complex genes, via aberrant transcription and RNA splicing. Exogenous Apc4, a hub protein in the network of affected genes, recovered the cell cycle, proliferation, and cell phenotypes of NSPCs caused by Pqbp1-cKO. These data reveal a mechanism of brain size control based on the simple reduction of the NSPC pool by cell cycle time elongation. Finally, we demonstrated that in utero gene therapy for Pqbp1-cKO mice by intraperitoneal injection of the PQBP1-AAV vector at E10 successfully rescued microcephaly with preserved cortical structures and improved behavioral abnormalities in Pqbp1-cKO mice, opening a new strategy for treating this intractable developmental disorder.

Original languageEnglish
Pages (from-to)459-471
Number of pages13
JournalMolecular Psychiatry
Volume20
Issue number4
DOIs
Publication statusPublished - Apr 2 2015

ASJC Scopus subject areas

  • Molecular Biology
  • Psychiatry and Mental health
  • Cellular and Molecular Neuroscience

Fingerprint Dive into the research topics of 'In utero gene therapy rescues microcephaly caused by Pqbp1-hypofunction in neural stem progenitor cells'. Together they form a unique fingerprint.

Cite this