Tumor suppressor ASXL1 is essential for the activation of INK4B expression in response to oncogene activity and anti-proliferative signals

Xudong Wu, Ida Holst Bekker-Jensen, Jesper Christensen, Kasper Dindler Rasmussen, Simone Sidoli, Yan Qi, Yu Kong, Xi Wang, Yajuan Cui, Zhijian Xiao, Guogang Xu, Kristine Williams, Juri Rappsilber, Casper Kaae Sønderby, Ole Winther, Ole N. Jensen, Kristian Helin

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

ASXL1 mutations are frequently found in hematological tumors, and loss of Asxl1 promotes myeloid transformation in mice. Here we present data supporting a role for an ASXL1-BAP1 complex in the deubiquitylation of mono-ubiquitylated lysine 119 on Histone H2A (H2AK119ub1) in vivo. The Polycomb group proteins control the expression of the INK4B-ARF-INK4A locus during normal development, in part through catalyzing mono-ubiquitylation of H2AK119. Since the activation of the locus INK4B-ARF-INK4A plays a fail-safe mechanism protecting against tumorigenesis, we investigated whether ASXL1-dependent H2A deubiquitylation plays a role in its activation. Interestingly, we found that ASXL1 is specifically required for the increased expression of p15 INK4B in response to both oncogenic signaling and extrinsic anti-proliferative signals. Since we found that ASXL1 and BAP1 both are enriched at the INK4B locus, our results suggest that activation of the INK4B locus requires ASXL1/BAP1-mediated deubiquitylation of H2AK119ub1. Consistently, our results show that ASXL1 mutations are associated with lower expression levels of p15 INK4B and a proliferative advantage of hematopoietic progenitors in primary bone marrow cells, and that depletion of ASXL1 in multiple cell lines results in resistance to growth inhibitory signals. Taken together, this study links ASXL1-mediated H2A deubiquitylation and transcriptional activation of INK4B expression to its tumor suppressor functions.

Original languageEnglish (US)
Pages (from-to)1205-1218
Number of pages14
JournalCell Research
Volume25
Issue number11
DOIs
StatePublished - Nov 1 2015
Externally publishedYes

Fingerprint

Oncogenes
Polycomb-Group Proteins
Mutation
Ubiquitination
Bone Marrow Cells
Histones
Transcriptional Activation
Lysine
Neoplasms
Carcinogenesis
Cell Line
Growth

Keywords

  • H2A ubiquitylation
  • INK4A
  • INK4B
  • Polycomb
  • tumor suppressor

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology

Cite this

Tumor suppressor ASXL1 is essential for the activation of INK4B expression in response to oncogene activity and anti-proliferative signals. / Wu, Xudong; Bekker-Jensen, Ida Holst; Christensen, Jesper; Rasmussen, Kasper Dindler; Sidoli, Simone; Qi, Yan; Kong, Yu; Wang, Xi; Cui, Yajuan; Xiao, Zhijian; Xu, Guogang; Williams, Kristine; Rappsilber, Juri; Sønderby, Casper Kaae; Winther, Ole; Jensen, Ole N.; Helin, Kristian.

In: Cell Research, Vol. 25, No. 11, 01.11.2015, p. 1205-1218.

Research output: Contribution to journalArticle

Wu, X, Bekker-Jensen, IH, Christensen, J, Rasmussen, KD, Sidoli, S, Qi, Y, Kong, Y, Wang, X, Cui, Y, Xiao, Z, Xu, G, Williams, K, Rappsilber, J, Sønderby, CK, Winther, O, Jensen, ON & Helin, K 2015, 'Tumor suppressor ASXL1 is essential for the activation of INK4B expression in response to oncogene activity and anti-proliferative signals', Cell Research, vol. 25, no. 11, pp. 1205-1218. https://doi.org/10.1038/cr.2015.121
Wu, Xudong ; Bekker-Jensen, Ida Holst ; Christensen, Jesper ; Rasmussen, Kasper Dindler ; Sidoli, Simone ; Qi, Yan ; Kong, Yu ; Wang, Xi ; Cui, Yajuan ; Xiao, Zhijian ; Xu, Guogang ; Williams, Kristine ; Rappsilber, Juri ; Sønderby, Casper Kaae ; Winther, Ole ; Jensen, Ole N. ; Helin, Kristian. / Tumor suppressor ASXL1 is essential for the activation of INK4B expression in response to oncogene activity and anti-proliferative signals. In: Cell Research. 2015 ; Vol. 25, No. 11. pp. 1205-1218.
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abstract = "ASXL1 mutations are frequently found in hematological tumors, and loss of Asxl1 promotes myeloid transformation in mice. Here we present data supporting a role for an ASXL1-BAP1 complex in the deubiquitylation of mono-ubiquitylated lysine 119 on Histone H2A (H2AK119ub1) in vivo. The Polycomb group proteins control the expression of the INK4B-ARF-INK4A locus during normal development, in part through catalyzing mono-ubiquitylation of H2AK119. Since the activation of the locus INK4B-ARF-INK4A plays a fail-safe mechanism protecting against tumorigenesis, we investigated whether ASXL1-dependent H2A deubiquitylation plays a role in its activation. Interestingly, we found that ASXL1 is specifically required for the increased expression of p15 INK4B in response to both oncogenic signaling and extrinsic anti-proliferative signals. Since we found that ASXL1 and BAP1 both are enriched at the INK4B locus, our results suggest that activation of the INK4B locus requires ASXL1/BAP1-mediated deubiquitylation of H2AK119ub1. Consistently, our results show that ASXL1 mutations are associated with lower expression levels of p15 INK4B and a proliferative advantage of hematopoietic progenitors in primary bone marrow cells, and that depletion of ASXL1 in multiple cell lines results in resistance to growth inhibitory signals. Taken together, this study links ASXL1-mediated H2A deubiquitylation and transcriptional activation of INK4B expression to its tumor suppressor functions.",
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AU - Wu, Xudong

AU - Bekker-Jensen, Ida Holst

AU - Christensen, Jesper

AU - Rasmussen, Kasper Dindler

AU - Sidoli, Simone

AU - Qi, Yan

AU - Kong, Yu

AU - Wang, Xi

AU - Cui, Yajuan

AU - Xiao, Zhijian

AU - Xu, Guogang

AU - Williams, Kristine

AU - Rappsilber, Juri

AU - Sønderby, Casper Kaae

AU - Winther, Ole

AU - Jensen, Ole N.

AU - Helin, Kristian

PY - 2015/11/1

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N2 - ASXL1 mutations are frequently found in hematological tumors, and loss of Asxl1 promotes myeloid transformation in mice. Here we present data supporting a role for an ASXL1-BAP1 complex in the deubiquitylation of mono-ubiquitylated lysine 119 on Histone H2A (H2AK119ub1) in vivo. The Polycomb group proteins control the expression of the INK4B-ARF-INK4A locus during normal development, in part through catalyzing mono-ubiquitylation of H2AK119. Since the activation of the locus INK4B-ARF-INK4A plays a fail-safe mechanism protecting against tumorigenesis, we investigated whether ASXL1-dependent H2A deubiquitylation plays a role in its activation. Interestingly, we found that ASXL1 is specifically required for the increased expression of p15 INK4B in response to both oncogenic signaling and extrinsic anti-proliferative signals. Since we found that ASXL1 and BAP1 both are enriched at the INK4B locus, our results suggest that activation of the INK4B locus requires ASXL1/BAP1-mediated deubiquitylation of H2AK119ub1. Consistently, our results show that ASXL1 mutations are associated with lower expression levels of p15 INK4B and a proliferative advantage of hematopoietic progenitors in primary bone marrow cells, and that depletion of ASXL1 in multiple cell lines results in resistance to growth inhibitory signals. Taken together, this study links ASXL1-mediated H2A deubiquitylation and transcriptional activation of INK4B expression to its tumor suppressor functions.

AB - ASXL1 mutations are frequently found in hematological tumors, and loss of Asxl1 promotes myeloid transformation in mice. Here we present data supporting a role for an ASXL1-BAP1 complex in the deubiquitylation of mono-ubiquitylated lysine 119 on Histone H2A (H2AK119ub1) in vivo. The Polycomb group proteins control the expression of the INK4B-ARF-INK4A locus during normal development, in part through catalyzing mono-ubiquitylation of H2AK119. Since the activation of the locus INK4B-ARF-INK4A plays a fail-safe mechanism protecting against tumorigenesis, we investigated whether ASXL1-dependent H2A deubiquitylation plays a role in its activation. Interestingly, we found that ASXL1 is specifically required for the increased expression of p15 INK4B in response to both oncogenic signaling and extrinsic anti-proliferative signals. Since we found that ASXL1 and BAP1 both are enriched at the INK4B locus, our results suggest that activation of the INK4B locus requires ASXL1/BAP1-mediated deubiquitylation of H2AK119ub1. Consistently, our results show that ASXL1 mutations are associated with lower expression levels of p15 INK4B and a proliferative advantage of hematopoietic progenitors in primary bone marrow cells, and that depletion of ASXL1 in multiple cell lines results in resistance to growth inhibitory signals. Taken together, this study links ASXL1-mediated H2A deubiquitylation and transcriptional activation of INK4B expression to its tumor suppressor functions.

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