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Lineage-specific splicing of a brain-enriched alternative exon promotes glioblastoma progression.


ABSTRACT: Tissue-specific alternative splicing is critical for the emergence of tissue identity during development, yet the role of this process in malignant transformation is undefined. Tissue-specific splicing involves evolutionarily conserved, alternative exons that represent only a minority of the total alternative exons identified. Many of these conserved exons have functional features that influence signaling pathways to profound biological effect. Here, we determined that lineage-specific splicing of a brain-enriched cassette exon in the membrane-binding tumor suppressor annexin A7 (ANXA7) diminishes endosomal targeting of the EGFR oncoprotein, consequently enhancing EGFR signaling during brain tumor progression. ANXA7 exon splicing was mediated by the ribonucleoprotein PTBP1, which is normally repressed during neuronal development. PTBP1 was highly expressed in glioblastomas due to loss of a brain-enriched microRNA (miR-124) and to PTBP1 amplification. The alternative ANXA7 splicing trait was present in precursor cells, suggesting that glioblastoma cells inherit the trait from a potential tumor-initiating ancestor and that these cells exploit this trait through accumulation of mutations that enhance EGFR signaling. Our data illustrate that lineage-specific splicing of a tissue-regulated alternative exon in a constituent of an oncogenic pathway eliminates tumor suppressor functions and promotes glioblastoma progression. This paradigm may offer a general model as to how tissue-specific regulatory mechanisms can reprogram normal developmental processes into oncogenic ones.

SUBMITTER: Ferrarese R 

PROVIDER: S-EPMC4071411 | biostudies-literature | 2014 Jul

REPOSITORIES: biostudies-literature

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Lineage-specific splicing of a brain-enriched alternative exon promotes glioblastoma progression.

Ferrarese Roberto R   Harsh Griffith R GR   Yadav Ajay K AK   Bug Eva E   Maticzka Daniel D   Reichardt Wilfried W   Dombrowski Stephen M SM   Miller Tyler E TE   Masilamani Anie P AP   Dai Fangping F   Kim Hyunsoo H   Hadler Michael M   Scholtens Denise M DM   Yu Irene L Y IL   Beck Jürgen J   Srinivasasainagendra Vinodh V   Costa Fabrizio F   Baxan Nicoleta N   Pfeifer Dietmar D   von Elverfeldt Dominik D   Backofen Rolf R   Weyerbrock Astrid A   Duarte Christine W CW   He Xiaolin X   Prinz Marco M   Chandler James P JP   Vogel Hannes H   Chakravarti Arnab A   Rich Jeremy N JN   Carro Maria S MS   Bredel Markus M  

The Journal of clinical investigation 20140527 7


Tissue-specific alternative splicing is critical for the emergence of tissue identity during development, yet the role of this process in malignant transformation is undefined. Tissue-specific splicing involves evolutionarily conserved, alternative exons that represent only a minority of the total alternative exons identified. Many of these conserved exons have functional features that influence signaling pathways to profound biological effect. Here, we determined that lineage-specific splicing  ...[more]

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