The impact of SF3B1 mutations in CLL on the DNA-damage response

Mutations or deletions in TP53 or ATM are well-known determinants of poor prognosis in chronic lymphocytic leukemia (CLL), but only account for approximately 40% of chemo-resistant patients. Genome-wide sequencing has uncovered novel mutations in the splicing factor sf3b1, that were in part associat...

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Veröffentlicht in:Leukemia 2015-05, Vol.29 (5), p.1133-1142
Hauptverfasser: te Raa, G D, Derks, I A M, Navrkalova, V, Skowronska, A, Moerland, P D, van Laar, J, Oldreive, C, Monsuur, H, Trbusek, M, Malcikova, J, Lodén, M, Geisler, C H, Hüllein, J, Jethwa, A, Zenz, T, Pospisilova, S, Stankovic, T, van Oers, M H J, Kater, A P, Eldering, E
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container_end_page 1142
container_issue 5
container_start_page 1133
container_title Leukemia
container_volume 29
creator te Raa, G D
Derks, I A M
Navrkalova, V
Skowronska, A
Moerland, P D
van Laar, J
Oldreive, C
Monsuur, H
Trbusek, M
Malcikova, J
Lodén, M
Geisler, C H
Hüllein, J
Jethwa, A
Zenz, T
Pospisilova, S
Stankovic, T
van Oers, M H J
Kater, A P
Eldering, E
description Mutations or deletions in TP53 or ATM are well-known determinants of poor prognosis in chronic lymphocytic leukemia (CLL), but only account for approximately 40% of chemo-resistant patients. Genome-wide sequencing has uncovered novel mutations in the splicing factor sf3b1, that were in part associated with ATM aberrations, suggesting functional synergy. We first performed detailed genetic analyses in a CLL cohort ( n =110) containing ATM , SF3B1 and TP53 gene defects. Next, we applied a newly developed multiplex assay for p53/ATM target gene induction and measured apoptotic responses to DNA damage. Interestingly, SF3B1 mutated samples without concurrent ATM and TP53 aberrations (sole SF3B1 ) displayed partially defective ATM/p53 transcriptional and apoptotic responses to various DNA-damaging regimens. In contrast, NOTCH1 or K/N-RAS mutated CLL displayed normal responses in p53/ATM target gene induction and apoptosis. In sole SF3B1 mutated cases, ATM kinase function remained intact, and γH2AX formation, a marker for DNA damage, was increased at baseline and upon irradiation. Our data demonstrate that single mutations in sf3b1 are associated with increased DNA damage and/or an aberrant response to DNA damage. Together, our observations may offer an explanation for the poor prognosis associated with SF3B1 mutations.
doi_str_mv 10.1038/leu.2014.318
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Our data demonstrate that single mutations in sf3b1 are associated with increased DNA damage and/or an aberrant response to DNA damage. Together, our observations may offer an explanation for the poor prognosis associated with SF3B1 mutations.</description><subject>38/77</subject><subject>45/23</subject><subject>631/67/1990/283/1895</subject><subject>82/80</subject><subject>Analysis</subject><subject>Apoptosis</subject><subject>Ataxia Telangiectasia Mutated Proteins - metabolism</subject><subject>Cancer</subject><subject>Cancer Research</subject><subject>Care and treatment</subject><subject>Chemotherapy</subject><subject>Chronic lymphocytic leukemia</subject><subject>Cohort Studies</subject><subject>Critical Care Medicine</subject><subject>Deoxyribonucleic acid</subject><subject>Development and progression</subject><subject>DNA</subject><subject>DNA Damage</subject><subject>DNA Mutational Analysis</subject><subject>Doxorubicin - pharmacology</subject><subject>Flow Cytometry</subject><subject>Gene Deletion</subject><subject>Gene expression</subject><subject>Gene Expression Regulation, Leukemic</subject><subject>Gene mutations</subject><subject>Gene sequencing</subject><subject>Genetic analysis</subject><subject>Genetic aspects</subject><subject>Genome, Human</subject><subject>Genome-wide association studies</subject><subject>Genomes</subject><subject>Health aspects</subject><subject>Hematology</subject><subject>Histones - metabolism</subject><subject>Humans</subject><subject>Imidazoles - pharmacology</subject><subject>Impact damage</subject><subject>Intensive</subject><subject>Internal Medicine</subject><subject>Irradiation</subject><subject>Kinases</subject><subject>Leukemia</subject><subject>Leukemia, Lymphocytic, Chronic, B-Cell - genetics</subject><subject>Lymphatic leukemia</subject><subject>Medicine</subject><subject>Medicine &amp; 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Genome-wide sequencing has uncovered novel mutations in the splicing factor sf3b1, that were in part associated with ATM aberrations, suggesting functional synergy. We first performed detailed genetic analyses in a CLL cohort ( n =110) containing ATM , SF3B1 and TP53 gene defects. Next, we applied a newly developed multiplex assay for p53/ATM target gene induction and measured apoptotic responses to DNA damage. Interestingly, SF3B1 mutated samples without concurrent ATM and TP53 aberrations (sole SF3B1 ) displayed partially defective ATM/p53 transcriptional and apoptotic responses to various DNA-damaging regimens. In contrast, NOTCH1 or K/N-RAS mutated CLL displayed normal responses in p53/ATM target gene induction and apoptosis. In sole SF3B1 mutated cases, ATM kinase function remained intact, and γH2AX formation, a marker for DNA damage, was increased at baseline and upon irradiation. Our data demonstrate that single mutations in sf3b1 are associated with increased DNA damage and/or an aberrant response to DNA damage. Together, our observations may offer an explanation for the poor prognosis associated with SF3B1 mutations.</abstract><cop>London</cop><pub>Nature Publishing Group UK</pub><pmid>25371178</pmid><doi>10.1038/leu.2014.318</doi><tpages>10</tpages></addata></record>
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subjects 38/77
45/23
631/67/1990/283/1895
82/80
Analysis
Apoptosis
Ataxia Telangiectasia Mutated Proteins - metabolism
Cancer
Cancer Research
Care and treatment
Chemotherapy
Chronic lymphocytic leukemia
Cohort Studies
Critical Care Medicine
Deoxyribonucleic acid
Development and progression
DNA
DNA Damage
DNA Mutational Analysis
Doxorubicin - pharmacology
Flow Cytometry
Gene Deletion
Gene expression
Gene Expression Regulation, Leukemic
Gene mutations
Gene sequencing
Genetic analysis
Genetic aspects
Genome, Human
Genome-wide association studies
Genomes
Health aspects
Hematology
Histones - metabolism
Humans
Imidazoles - pharmacology
Impact damage
Intensive
Internal Medicine
Irradiation
Kinases
Leukemia
Leukemia, Lymphocytic, Chronic, B-Cell - genetics
Lymphatic leukemia
Medicine
Medicine & Public Health
Methods
Mutation
Oncology
original-article
p53 Protein
Phosphoproteins - genetics
Phosphorylation
Piperazines - pharmacology
Prognosis
Radiation
Radiation damage
Receptor, Notch1 - genetics
Ribonucleoprotein, U2 Small Nuclear - genetics
RNA Splicing Factors
Splicing factors
Transcription
Tumor Suppressor Protein p53 - genetics
Vidarabine - analogs & derivatives
Vidarabine - pharmacology
title The impact of SF3B1 mutations in CLL on the DNA-damage response
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