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Papadaki V, Erpapazoglou Z, Kokkori M, Rogalska M, Potiri M, Birladeanu A, Tsakiri E, Ashktorab H, Smoot D, Papanikolopoulou K, Samiotaki M, Kafasla P. IQGAP1 mediates the communication between the nucleus and the mitochondria via NDUFS4 alternative splicing. NAR Cancer 2023; 5:zcad046. [PMID: 37636315 PMCID: PMC10448856 DOI: 10.1093/narcan/zcad046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Revised: 08/04/2023] [Accepted: 08/10/2023] [Indexed: 08/29/2023] Open
Abstract
Constant communication between mitochondria and nucleus ensures cellular homeostasis and adaptation to mitochondrial stress. Anterograde regulatory pathways involving a large number of nuclear-encoded proteins control mitochondrial biogenesis and functions. Such functions are deregulated in cancer cells, resulting in proliferative advantages, aggressive disease and therapeutic resistance. Transcriptional networks controlling the nuclear-encoded mitochondrial genes are known, however alternative splicing (AS) regulation has not been implicated in this communication. Here, we show that IQGAP1, a scaffold protein regulating AS of distinct gene subsets in gastric cancer cells, participates in AS regulation that strongly affects mitochondrial respiration. Combined proteomic and RNA-seq analyses of IQGAP1KO and parental cells show that IQGAP1KO alters an AS event of the mitochondrial respiratory chain complex I (CI) subunit NDUFS4 and downregulates a subset of CI subunits. In IQGAP1KO cells, CI intermediates accumulate, resembling assembly deficiencies observed in patients with Leigh syndrome bearing NDUFS4 mutations. Mitochondrial CI activity is significantly lower in KO compared to parental cells, while exogenous expression of IQGAP1 reverses mitochondrial defects of IQGAP1KO cells. Our work sheds light to a novel facet of IQGAP1 in mitochondrial quality control that involves fine-tuning of CI activity through AS regulation in gastric cancer cells relying highly on mitochondrial respiration.
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Affiliation(s)
- Vasiliki Papadaki
- Institute for Fundamental Biomedical Research, BSRC “Al. Fleming”, Vari 16672, Greece
| | - Zoi Erpapazoglou
- Institute for Fundamental Biomedical Research, BSRC “Al. Fleming”, Vari 16672, Greece
| | - Maria Kokkori
- Institute for Fundamental Biomedical Research, BSRC “Al. Fleming”, Vari 16672, Greece
| | - Malgorzata Ewa Rogalska
- Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Barcelona, Spain
| | - Myrto Potiri
- Institute for Fundamental Biomedical Research, BSRC “Al. Fleming”, Vari 16672, Greece
| | - Andrada Birladeanu
- Institute for Fundamental Biomedical Research, BSRC “Al. Fleming”, Vari 16672, Greece
| | - Eleni N Tsakiri
- Institute for Fundamental Biomedical Research, BSRC “Al. Fleming”, Vari 16672, Greece
| | - Hassan Ashktorab
- Department of Medicine and Cancer Center, Howard University, Washington, DC, USA
| | - Duane T Smoot
- Department of Medicine, Meharry Medical Center, Nashville, TN, USA
| | | | | | - Panagiota Kafasla
- Institute for Fundamental Biomedical Research, BSRC “Al. Fleming”, Vari 16672, Greece
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San B, Rougeot J, Voeltzke K, van Vegchel G, Aben M, Andralojc KM, Flik G, Kamminga LM. The ezh2(sa1199) mutant zebrafish display no distinct phenotype. PLoS One 2019; 14:e0210217. [PMID: 30677064 PMCID: PMC6345456 DOI: 10.1371/journal.pone.0210217] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Accepted: 12/18/2018] [Indexed: 12/27/2022] Open
Abstract
Polycomb group (PcG) proteins are essential regulators of epigenetic gene silencing and development. The PcG protein enhancer of zeste homolog 2 (Ezh2) is a key component of the Polycomb Repressive Complex 2 and is responsible for placing the histone H3 lysine 27 trimethylation (H3K27me3) repressive mark on the genome through its methyltransferase domain. Ezh2 is highly conserved in vertebrates. We studied the role of ezh2 during development of zebrafish with the use of a mutant allele (ezh2(sa1199), R18STOP), which has a stop mutation in the second exon of the ezh2 gene. Two versions of the same line were used during this study. The first and original version of zygotic ezh2(sa1199) mutants unexpectedly retained ezh2 expression in brain, gut, branchial arches, and eyes at 3 days post-fertilization (dpf), as revealed by in-situ hybridization. Moreover, the expression pattern in homozygous mutants was identical to that of wild types, indicating that mutant ezh2 mRNA is not subject to nonsense mediated decay (NMD) as predicted. Both wild type and ezh2 mutant embryos presented edemas at 2 and 3 dpf. The line was renewed by selective breeding to counter select the non-specific phenotypes and survival was assessed. In contrast to earlier studies on ezh2 mutant zebrafish, ezh2(sa1199) mutants survived until adulthood. Interestingly, the ezh2 mRNA and Ezh2 protein were present during adulthood (70 dpf) in both wild type and ezh2(sa1199) mutant zebrafish. We conclude that the ezh2(sa1199) allele does not exhibit an ezh2 loss-of-function phenotype.
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Affiliation(s)
- Bilge San
- Radboud University Medical Center, Radboud Institute for Molecular Life Sciences, Nijmegen, The Netherlands
| | - Julien Rougeot
- Radboud University, Faculty of Science, Department of Molecular Biology, Radboud Institute for Molecular Life Sciences, Nijmegen, The Netherlands
| | - Kai Voeltzke
- Radboud University, Faculty of Science, Department of Molecular Biology, Radboud Institute for Molecular Life Sciences, Nijmegen, The Netherlands
| | - Gertie van Vegchel
- Radboud University, Faculty of Science, Department of Molecular Biology, Radboud Institute for Molecular Life Sciences, Nijmegen, The Netherlands
| | - Marco Aben
- Radboud University Medical Center, Radboud Institute for Molecular Life Sciences, Nijmegen, The Netherlands
- Radboud University, Faculty of Science, Department of Molecular Biology, Radboud Institute for Molecular Life Sciences, Nijmegen, The Netherlands
| | - Karolina M. Andralojc
- Radboud University, Faculty of Science, Department of Molecular Biology, Radboud Institute for Molecular Life Sciences, Nijmegen, The Netherlands
| | - Gert Flik
- Department of Animal Ecology and Physiology, Radboud University, Nijmegen, The Netherlands
| | - Leonie M. Kamminga
- Radboud University Medical Center, Radboud Institute for Molecular Life Sciences, Nijmegen, The Netherlands
- Radboud University, Faculty of Science, Department of Molecular Biology, Radboud Institute for Molecular Life Sciences, Nijmegen, The Netherlands
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Panelli D, Lorusso FP, Trentadue R, Stella A, Sardanelli AM, Papa S. The hUPF1-NMD factor controls the cellular transcript levels of different genes of complex I of the respiratory chain. Biochimie 2012; 94:2600-7. [DOI: 10.1016/j.biochi.2012.07.022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2012] [Accepted: 07/26/2012] [Indexed: 10/28/2022]
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Pagniez-Mammeri H, Loublier S, Legrand A, Bénit P, Rustin P, Slama A. Mitochondrial complex I deficiency of nuclear origin I. Structural genes. Mol Genet Metab 2012; 105:163-72. [PMID: 22142868 DOI: 10.1016/j.ymgme.2011.11.188] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/28/2011] [Revised: 11/09/2011] [Accepted: 11/09/2011] [Indexed: 10/15/2022]
Abstract
Complex I (or NADH-ubiquinone oxidoreductase), is by far the largest respiratory chain complex with 38 subunits nuclearly encoded and 7 subunits encoded by the mitochondrial genome. Its deficiency is the most frequently encountered in mitochondrial disorders. Here, we summarize recent data obtained on architecture of complex I, and review the pathogenic mutations identified to date in nuclear structural complex I genes. The structural NDUFS1, NDUFS2, NDUFV1, and NDUFS4 genes are mutational hot spot genes for isolated complex I deficiency. The majority of the pathogenic mutations are private and the genotype-phenotype correlation is inconsistent in the rare recurrent mutations.
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Affiliation(s)
- Hélène Pagniez-Mammeri
- Laboratoire de Biochimie, APHP Hôpital de Bicêtre, 78 rue du Général Leclerc, 94275 Le Kremlin Bicêtre cedex, France
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Petruzzella V, Sardanelli AM, Scacco S, Panelli D, Papa F, Trentadue R, Papa S. Dysfunction of mitochondrial respiratory chain complex I in neurological disorders: genetics and pathogenetic mechanisms. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2012; 942:371-84. [PMID: 22399432 DOI: 10.1007/978-94-007-2869-1_17] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
This chapter covers genetic and biochemical aspects of mitochondrial bioenergetics dysfunction in neurological disorders associated with complex I defects. Complex I formation and functionality in mammalian cells depends on coordinated expression of nuclear and mitochondrial genes, post-translational subunit modifications, mitochondrial import/maturation of nuclear encoded subunits, subunits interaction and stepwise assembly, and on proteolytic processing. Examples of complex I dysfunction are herein presented: homozygous mutations in the nuclear NDUFS1 and NDUFS4 genes for structural components of complex I; an autosomic recessive form of encephalopathy associated with enhanced proteolytic degradation of complex I; familial cases of Parkinson associated to mutations in the PINK1 and Parkin genes, in particular, homoplasmic mutations in the ND5 and ND6 mitochondrial genes of the complex I, coexistent with mutation in the PINK1 gene. This knowledge, besides clarifying molecular aspects of the pathogenesis of hereditary diseases, can also provide hints for understanding the involvement of complex I in neurological disorders, as well as for developing therapeutical strategies.
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Affiliation(s)
- Vittoria Petruzzella
- Department of Basic Medical Sciences, University of Bari, Policlinico, Bari, Italy
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Papa S, Rasmo DD, Technikova-Dobrova Z, Panelli D, Signorile A, Scacco S, Petruzzella V, Papa F, Palmisano G, Gnoni A, Micelli L, Sardanelli AM. Respiratory chain complex I, a main regulatory target of the cAMP/PKA pathway is defective in different human diseases. FEBS Lett 2011; 586:568-77. [PMID: 21945319 DOI: 10.1016/j.febslet.2011.09.019] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2011] [Revised: 09/08/2011] [Accepted: 09/13/2011] [Indexed: 12/15/2022]
Abstract
In mammals, complex I (NADH-ubiquinone oxidoreductase) of the mitochondrial respiratory chain has 31 supernumerary subunits in addition to the 14 conserved from prokaryotes to humans. Multiplicity of structural protein components, as well as of biogenesis factors, makes complex I a sensible pace-maker of mitochondrial respiration. The work reviewed here shows that the cAMP/PKA pathway regulates the biogenesis, assembly and catalytic activity of complex I and mitochondrial oxygen superoxide production. The structural, functional and regulatory complexity of complex I, renders it particularly vulnerable to genetic and sporadic pathological factors. Complex I dysfunction has, indeed, been found, to be associated with several human diseases. Knowledge of the pathogenetic mechanisms of these diseases can help to develop new therapeutic strategies.
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Affiliation(s)
- Sergio Papa
- Department of Basic Medical Sciences, Section of Medical Biochemistry, University of Bari Aldo Moro, Bari, Italy.
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De Rasmo D, Palmisano G, Scacco S, Technikova-Dobrova Z, Panelli D, Cocco T, Sardanelli AM, Gnoni A, Micelli L, Trani A, Di Luccia A, Papa S. Phosphorylation pattern of the NDUFS4 subunit of complex I of the mammalian respiratory chain. Mitochondrion 2010; 10:464-71. [PMID: 20433953 DOI: 10.1016/j.mito.2010.04.005] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2010] [Revised: 03/23/2010] [Accepted: 04/21/2010] [Indexed: 10/19/2022]
Abstract
The NDUFS4 subunit of complex I of the mammalian respiratory chain has a fully conserved carboxy-terminus with a canonical RVSTK phosphorylation site. Immunochemical analysis with specific antibodies shows that the serine in this site of the protein is natively present in complex I in both the phosphorylated and non-phosphorylated state. Two-dimensional IEF/SDS-PAGE electrophoresis, (32)P labelling and immunodetection show that "in vitro" PKA phosphorylates the serine in the C-terminus of the NDUFS4 subunit in isolated bovine complex I. (32)P labelling and TLC phosphoaminoacid mapping show that PKA phosphorylates serine and threonine residues in the purified heterologous human NDUFS4 protein.
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Affiliation(s)
- Domenico De Rasmo
- Department of Medical Biochemistry, Biology and Physics (DIBIFIM), University of Bari, Italy
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Pathogenetic mechanisms in hereditary dysfunctions of complex I of the respiratory chain in neurological diseases. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2009; 1787:502-17. [DOI: 10.1016/j.bbabio.2008.12.018] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2008] [Revised: 12/23/2008] [Accepted: 12/30/2008] [Indexed: 12/21/2022]
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