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Mutations in a Human ROBO Gene Disrupt Hindbrain Axon Pathway Crossing and Morphogenesis
Joanna C. Jen,1*Wai-Man Chan,7Thomas M. Bosley,10Jijun Wan,1Janai R. Carr,1Udo Rüb,11David Shattuck,1Georges Salamon,2Lili C. Kudo,3Jing Ou,1Doris D. M. Lin,12Mustafa A. M. Salih,13Tülay Kansu,14Hesham al Dhalaan,15Zayed al Zayed,16David B. MacDonald,15Bent Stigsby,15Andreas Plaitakis,17Emmanuel K. Dretakis,18Irene Gottlob,19Christina Pieh,20Elias I. Traboulsi,21Qing Wang,21Lejin Wang,21Caroline Andrews,7,9Koki Yamada,7,9Joseph L. Demer,1,4Shaheen Karim,4Jeffry R. Alger,2Daniel H. Geschwind,1Thomas Deller,11Nancy L. Sicotte,1Stanley F. Nelson,5Robert W. Baloh,1,6Elizabeth C. Engle7,8,9*
The mechanisms controlling axon guidance are of fundamentalimportance in understanding brain development. Growing corticospinaland somatosensory axons cross the midline in the medulla toreach their targets and thus form the basis of contralateralmotor control and sensory input. The motor and sensory projectionsappeared uncrossed in patients with horizontal gaze palsy withprogressive scoliosis (HGPPS). In patients affected with HGPPS,we identified mutations in the ROBO3 gene, which shares homologywith roundabout genes important in axon guidance in developingDrosophila, zebrafish, and mouse. Like its murine homolog Rig1/Robo3,but unlike other Robo proteins, ROBO3 is required for hindbrainaxon midline crossing.
1 Department of Neurology, University of California, Los Angeles, CA 90095, USA. 2 Department of Radiology, University of California, Los Angeles, CA 90095, USA. 3 Interdepartmental Program in Neurosciences, University of California, Los Angeles, CA 90095, USA. 4 Department of Ophthalmology, University of California, Los Angeles, CA 90095, USA. 5 Department of Human Genetics, University of California, Los Angeles, CA 90095, USA. 6 Department of Surgery, University of California, Los Angeles, CA 90095, USA. 7 Division of Genetics, Children's Hospital Boston, Boston, MA 02115, USA. 8 Department of Neurology, Children's Hospital Boston, Boston, MA 02115, USA. 9 Harvard Medical School, Boston, MA 02115, USA. 10 Neuro-ophthalmology Division, King Khaled Eye Specialist Hospital, Riyadh, Saudi Arabia. 11 Institute of Clinical Neuroanatomy, J. W. Goethe University, 60590 Frankfurt/M, Germany. 12 Department of Radiology and Radiologic Science, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA. 13 Department of Pediatrics, King Khalid University Hospital, Riyadh, Saudi Arabia. 14 Neuro-Ophthalmology Unit, Hacettepe University Hospitals, Ankara, Turkey. 15 Neuroscience Department, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia. 16 Surgery Department, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia. 17 Department of Neurology, University of Crete, Heraklion, Crete, Greece. 18 Department of Orthopaedics-Traumatology, University of Crete, Heraklion, Crete, Greece. 19 Department of Ophthalmology, Leicester University, Leicester, UK. 20 University Eye Clinic, University of Freiburg, Freiburg, Germany. 21 Cleveland Clinic Foundation, Cleveland, OH, USA.
Present address: Laboratory of Molecular Ophthalmic Genetics,Department of Pediatric Ophthalmology and Strabismus, PekingUniversity Eye Center, Peking University No. 3 Hospital.
* To whom correspondence should be addressed. E-mail: jjen{at}ucla.edu (J.C.J.); engle{at}enders.tch.harvard.edu (E.C.E.)
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