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Series GSE64425 Query DataSets for GSE64425
Status Public on Jan 21, 2016
Title The MYC-MIZ1 interaction defines tumor identity
Organism Mus musculus
Experiment type Genome binding/occupancy profiling by high throughput sequencing
Expression profiling by high throughput sequencing
Summary Medulloblastoma (MB) is the most common malignant brain tumor. MB is a cerebellar tumor that occurs mostly in children between the ages of 3-7 years but also in adults. Human MBs are classified into four subgroups: Wingless (WNT), Sonic Hedgehog (SHH), Group 3 (G3) and G4, each of which with distinct molecular signatures. SHH MBs with MYCN amplification and TP53 mutations and G3 MBs characterized by C-MYC (MYC) overexpression in ~17% of cases from gene amplification with stem like properties, are the most aggressive and least curable with current therapeutic regimen. Using an orthotopic transplant approach, we found that enforced expression of MYCN in cerebellar granule neural progenitors (CGNPs) from 5-7 days old Trp53-null mice induced SHH MBs after transfer in the cortices or cerebella of naive recipient mice. In contrast, overexpression of MYC induced G3 MBs. Because MYCN and MYC bind to the same E-box DNA sequences, we hypothesized that the difference between MYC and MYCN-induced gene expression and tumor identity might be due to their interaction with different partners in CGNPs. In this study, we investigated the role of the Myc interacting zinc finger protein 1 (MIZ1). We found that MIZ1 binds with higher affinity to MYC than to MYCN and that MIZ1 and MYC co-occupy thousands of promoters in G3 MB. Remarkably, enforced expression of a MYC mutant (MYCV394D) that no longer binds to MIZ1 in Trp53-null CGNPs or expression of wild type MYC in CGNPs that lack functional Miz1 resulted in massive changes of the resulting tumor’s transcriptional program. Tumors differed from both SHH and G3 medulloblastoma and had a later time of onset compared to MYC-driven G3 medulloblastoma. Our data demonstrate that interaction of MYC with MIZ1 is required for the development of G3 medulloblastoma.
Overall design ChIP-Seq experiments for Miz1, c-Myc and NMyc from murine medulloblastoma material. Either sorted tumor cells (Miz1 and c-Myc) or spheres from tumor cells (Miz1 and NMyc) were used. Input-samples were sequenced as controls. RNA-Seq from G3 medulloblastomas after restoration of Atoh1 expression.
Contributor(s) Vo BT, Wolf E, Kawauchi D, Gebhardt A, Rehg J, Walz S, Finkelstein D, Murphy BL, Youn YH, Han Y, Eilers M, Roussel MF
Citation(s) 26766587
Submission date Dec 22, 2014
Last update date May 15, 2019
Contact name Martin Eilers
Organization name University of Wuerzburg
Department Chair for Biochemistry and Molecular Biology
Lab Martin Eilers
Street address Am Hubland
City Wuerzburg
ZIP/Postal code 97074
Country Germany
Platforms (2)
GPL11002 Illumina Genome Analyzer IIx (Mus musculus)
GPL17021 Illumina HiSeq 2500 (Mus musculus)
Samples (23)
GSM1571162 input_G3-medulloblastoma
GSM1571163 Miz1_G3-medulloblastoma
GSM1571164 Myc_G3-medulloblastoma
BioProject PRJNA270996
SRA SRP051474

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Supplementary file Size Download File type/resource
GSE64425_RAW.tar 667.2 Mb (http)(custom) TAR (of BED, WIG)
GSE64425_RNAseq_Atoh1_restoration_differential_gene_expression.txt.gz 1006.3 Kb (ftp)(http) TXT
GSE64425_matrix_file.txt.gz 642.2 Kb (ftp)(http) TXT
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Raw data are available in SRA
Processed data provided as supplementary file
Processed data are available on Series record

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