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PITX1 Is a Regulator of TERT Expression in Prostate Cancer with Prognostic Power

by Rippe, Karsten , Jaishankar, Neeraja , Oswald, Marcus , Baniahmad, Aria , Sauter, Guido , Röll, Daniela , Stenzel, Alexander , Fraune, Christoph , Erfle, Holger , Gunkel, Manuel , Koenig, Rainer , Braun, Delia , Polonski, Adam , Knotz, Caroline , Rohr, Karl , Schroeder, Cornelia , Wollmann, Thomas , Poos, Alexandra , Makrypidi-Fraune, Georgia , Chung, Inn , Graefen, Markus , Frank, Lukas , Meiners, Jan , Simon, Ronald , Spilger, Roman

in Androgens / Biomarkers / Brachytherapy / Cancer therapies / Cell division / Chromatin / DNA methylation / Gene expression / Genomes / Invasiveness / Linear programming / Metastases / Metastasis / Mutation / Optimization / Prostate cancer / Prostatectomy / RNA-directed DNA polymerase / Semantics / Surveillance / Telomerase / Telomeres / Transcription factors / Transcriptomes / Tumors

2022

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PITX1 Is a Regulator of TERT Expression in Prostate Cancer with Prognostic Power

2022

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PITX1 Is a Regulator of TERT Expression in Prostate Cancer with Prognostic Power

2022

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Journal Article

PITX1 Is a Regulator of TERT Expression in Prostate Cancer with Prognostic Power

Rippe, Karsten,

Jaishankar, Neeraja,

Oswald, Marcus,

Baniahmad, Aria,

Sauter, Guido,

Röll, Daniela,

Stenzel, Alexander,

Fraune, Christoph,

Erfle, Holger,

Gunkel, Manuel,

Koenig, Rainer,

Braun, Delia,

Polonski, Adam,

Knotz, Caroline,

Rohr, Karl,

Schroeder, Cornelia,

Wollmann, Thomas,

Poos, Alexandra,

Makrypidi-Fraune, Georgia,

Chung, Inn,

Graefen, Markus,

Frank, Lukas,

Meiners, Jan,

Simon, Ronald,

Spilger, Roman

2022

Overview

The current risk stratification in prostate cancer (PCa) is frequently insufficient to adequately predict disease development and outcome. One hallmark of cancer is telomere maintenance. For telomere maintenance, PCa cells exclusively employ telomerase, making it essential for this cancer entity. However, TERT, the catalytic protein component of the reverse transcriptase telomerase, itself does not suit as a prognostic marker for prostate cancer as it is rather low expressed. We investigated if, instead of TERT, transcription factors regulating TERT may suit as prognostic markers. To identify transcription factors regulating TERT, we developed and applied a new gene regulatory modeling strategy to a comprehensive transcriptome dataset of 445 primary PCa. Six transcription factors were predicted as TERT regulators, and most prominently, the developmental morphogenic factor PITX1. PITX1 expression positively correlated with telomere staining intensity in PCa tumor samples. Functional assays and chromatin immune-precipitation showed that PITX1 activates TERT expression in PCa cells. Clinically, we observed that PITX1 is an excellent prognostic marker, as concluded from an analysis of more than 15,000 PCa samples. PITX1 expression in tumor samples associated with (i) increased Ki67 expression indicating increased tumor growth, (ii) a worse prognosis, and (iii) correlated with telomere length.

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