Abstract
The glioma amplified sequence 41 (GAS41) was previously isolated by microdissection mediated cDNA capture from the glioblastoma multiforme cell line TX3868 and shown to be frequently amplified in human gliomas. We determined the complete cDNA sequence of the GAS41 gene, demonstrated that the GAS41 protein is evolutionarily conserved, specifically at the N-terminus, and identified the yeast transcription factor tf2f domain within the GAS41 sequence. A human multiple-tissue Northern blot revealed ubiquitous expression of GAS41 with the highest expression in human brain. After generating polyclonal antibodies we found GAS41 protein expression in the nucleus of the TX3868 cell line by Western blot analysis and immunofluorescence microscopy. The nuclear localization was confirmed for several human tumors including gliomas of different grades of malignancy. In neuroblastoma however, GAS41 was found in the nucleoli but not in the nucleoplasm. Yeast two-hybrid screening of the TX3868 cell line identified the nuclear mitotic apparatus protein (NuMA), the KIAA1009 protein, and prefoldin subunit 1 (PFDN1) as potential interacting partners of GAS41. We generated a polyclonal antibody against the KIAA1009 protein and we demonstrated that the KIAA1009 protein is a nuclear protein, which appears to be co-localized with the GAS41 protein and NuMA.
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Acknowledgements
The authors thank Dr WI Steudel and the staff of the Neurosurgical Clinic for providing fresh tumor samples, Dr Norbert Schuster, Department of Anatomy, for the kind gift of the nucleolin-specific antibody and the neuroblastoma cell lines and Dr Jens Meyer for critical reading of the manuscript. This work was supported by a Grant from the Deutsche Forschungsgemeinschaft (SFB 399, A1).
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Munnia, A., Schütz, N., Romeike, B. et al. Expression, cellular distribution and protein binding of the glioma amplified sequence (GAS41), a highly conserved putative transcription factor. Oncogene 20, 4853–4863 (2001). https://doi.org/10.1038/sj.onc.1204650
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DOI: https://doi.org/10.1038/sj.onc.1204650
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