title: Septin 14 is involved in cortical neuronal migration via interaction with Septin 4.
abstract: Septins are a family of conserved guanosine triphosphate/guanosine diphosphate-binding proteins implicated in a variety of cellular functions such as cell cycle control and cytokinesis. Although several members of septin family, including Septin 14 (Sept14), are abundantly expressed in nervous tissues, little is known about their physiological functions, especially in neuronal development. Here, we report that Sept14 is strongly expressed in the cortical plate of developing cerebral cortex. Knockdown experiments by using the method of in utero electroporation showed that reduction of Sept14 caused inhibition of cortical neuronal migration. Whereas cDNA encoding RNA interference-resistant Sept14 rescued the migration defect, the C-terminal deletion mutant of Sept14 did not. Biochemical analyses revealed that C-terminal coiled-coil region of Sept14 interacts with Septin 4 (Sept4). Knockdown experiments showed that Sept4 is also involved in cortical neuronal migration in vivo. In addition, knockdown of Sept14 or Sept4 inhibited leading process formation in migrating cortical neurons. These results suggest that Sept14 is involved in neuronal migration in cerebral cortex via interaction with Sept4.
authors.affiliation: Department of Molecular Neurobiology, Aichi Human Service Center, Institute for Developmental Research, Kasugai, Aichi 480-0392, Japan.
authors.forename: Tomoyasu
authors.initials: T
authors.lastname: Shinoda
authors.forename: Hidenori
authors.initials: H
authors.lastname: Ito
authors.forename: Kaori
authors.initials: K
authors.lastname: Sudo
authors.forename: Ikuko
authors.initials: I
authors.lastname: Iwamoto
authors.forename: Rika
authors.initials: R
authors.lastname: Morishita
authors.forename: Koh-ichi
authors.initials: K
authors.lastname: Nagata
mesh_terms: D000818:Animals; D019556:COS Cells; D002455:Cell Division; D002465:Cell Movement; D002478:Cells, Cultured; D002540:Cerebral Cortex / Q000166:cytology*; D002522:Chlorocebus aethiops; D003598:Cytoskeletal Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D005260:Female; D019204:GTP-Binding Proteins / Q000378:metabolism*; D020869:Gene Expression Profiling; D005786:Gene Expression Regulation; D020868:Gene Silencing; D051379:Mice; D008813:Mice, Inbred ICR; D009474:Neurons / Q000166:cytology* / Q000378:metabolism*; D011485:Protein Binding; D017434:Protein Structure, Tertiary; D011554:Pseudopodia / Q000378:metabolism; D034741:RNA, Small Interfering / Q000378:metabolism; D058112:Septins
chemical_list: D003598:Cytoskeletal Proteins; D034741:RNA, Small Interfering; D019204:GTP-Binding Proteins; C552172:Sept14 protein, mouse; C115474:Sept4 protein, mouse; D058112:Septins