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Sturm Á, Sharma H, Bodnár F, Aslam M, Kovács T, Németh Á, Hotzi B, Billes V, Sigmond T, Tátrai K, Egyed B, Téglás-Huszár B, Schlosser G, Charmpilas N, Ploumi C, Perczel A, Tavernarakis N, Vellai T. N6-Methyladenine Progressively Accumulates in Mitochondrial DNA during Aging. Int J Mol Sci 2023; 24:14858. [PMID: 37834309 PMCID: PMC10573865 DOI: 10.3390/ijms241914858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Revised: 09/26/2023] [Accepted: 09/29/2023] [Indexed: 10/15/2023] Open
Abstract
N6-methyladenine (6mA) in the DNA is a conserved epigenetic mark with various cellular, physiological and developmental functions. Although the presence of 6mA was discovered a few years ago in the nuclear genome of distantly related animal taxa and just recently in mammalian mitochondrial DNA (mtDNA), accumulating evidence at present seriously questions the presence of N6-adenine methylation in these genetic systems, attributing it to methodological errors. In this paper, we present a reliable, PCR-based method to determine accurately the relative 6mA levels in the mtDNA of Caenorhabditis elegans, Drosophila melanogaster and dogs, and show that these levels gradually increase with age. Furthermore, daf-2(-)-mutant worms, which are defective for insulin/IGF-1 (insulin-like growth factor) signaling and live twice as long as the wild type, display a half rate at which 6mA progressively accumulates in the mtDNA as compared to normal values. Together, these results suggest a fundamental role for mtDNA N6-adenine methylation in aging and reveal an efficient diagnostic technique to determine age using DNA.
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Affiliation(s)
- Ádám Sturm
- Department of Genetics, Eötvös Loránd University, Pázmány Péter sétány 1/C, 1117 Budapest, Hungary; (H.S.); (B.E.)
- Genetics Research Group, Eötvös Loránd Research Network-Eötvös Loránd University, 1117 Budapest, Hungary
| | - Himani Sharma
- Department of Genetics, Eötvös Loránd University, Pázmány Péter sétány 1/C, 1117 Budapest, Hungary; (H.S.); (B.E.)
| | - Ferenc Bodnár
- Department of Genetics, Eötvös Loránd University, Pázmány Péter sétány 1/C, 1117 Budapest, Hungary; (H.S.); (B.E.)
| | - Maryam Aslam
- Department of Genetics, Eötvös Loránd University, Pázmány Péter sétány 1/C, 1117 Budapest, Hungary; (H.S.); (B.E.)
| | - Tibor Kovács
- Department of Genetics, Eötvös Loránd University, Pázmány Péter sétány 1/C, 1117 Budapest, Hungary; (H.S.); (B.E.)
| | - Ákos Németh
- Department of Genetics, Eötvös Loránd University, Pázmány Péter sétány 1/C, 1117 Budapest, Hungary; (H.S.); (B.E.)
| | - Bernadette Hotzi
- Department of Genetics, Eötvös Loránd University, Pázmány Péter sétány 1/C, 1117 Budapest, Hungary; (H.S.); (B.E.)
- Genetics Research Group, Eötvös Loránd Research Network-Eötvös Loránd University, 1117 Budapest, Hungary
| | - Viktor Billes
- Department of Genetics, Eötvös Loránd University, Pázmány Péter sétány 1/C, 1117 Budapest, Hungary; (H.S.); (B.E.)
- Genetics Research Group, Eötvös Loránd Research Network-Eötvös Loránd University, 1117 Budapest, Hungary
| | - Tímea Sigmond
- Department of Genetics, Eötvös Loránd University, Pázmány Péter sétány 1/C, 1117 Budapest, Hungary; (H.S.); (B.E.)
| | - Kitti Tátrai
- Department of Genetics, Eötvös Loránd University, Pázmány Péter sétány 1/C, 1117 Budapest, Hungary; (H.S.); (B.E.)
| | - Balázs Egyed
- Department of Genetics, Eötvös Loránd University, Pázmány Péter sétány 1/C, 1117 Budapest, Hungary; (H.S.); (B.E.)
| | - Blanka Téglás-Huszár
- Department of Genetics, Eötvös Loránd University, Pázmány Péter sétány 1/C, 1117 Budapest, Hungary; (H.S.); (B.E.)
| | - Gitta Schlosser
- Momentum Ion Mobility Mass Spectrometry Research Group, Hungarian Academy of Sciences-Eötvös Loránd University, 1117 Budapest, Hungary
| | - Nikolaos Charmpilas
- Institute of Molecular Biology and Biotechnology, Foundation of Research and Technology-Hellas, P.O. Box 1385 Heraklion, Greece
| | - Christina Ploumi
- Institute of Molecular Biology and Biotechnology, Foundation of Research and Technology-Hellas, P.O. Box 1385 Heraklion, Greece
| | - András Perczel
- Department of Organic Chemistry, Eötvös Loránd University, 1117 Budapest, Hungary
| | - Nektarios Tavernarakis
- Institute of Molecular Biology and Biotechnology, Foundation of Research and Technology-Hellas, P.O. Box 1385 Heraklion, Greece
| | - Tibor Vellai
- Department of Genetics, Eötvös Loránd University, Pázmány Péter sétány 1/C, 1117 Budapest, Hungary; (H.S.); (B.E.)
- Genetics Research Group, Eötvös Loránd Research Network-Eötvös Loránd University, 1117 Budapest, Hungary
- Vellab Biotech Ltd., 6722 Szeged, Hungary
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Sigmond T, Vellai T. Lysosomal alteration links food limitation to longevity. Nat Aging 2023; 3:1048-1050. [PMID: 37620583 DOI: 10.1038/s43587-023-00483-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/26/2023]
Affiliation(s)
- Tímea Sigmond
- Department of Genetics, Eötvös Loránd University (ELTE), Budapest, Hungary
| | - Tibor Vellai
- Department of Genetics, Eötvös Loránd University (ELTE), Budapest, Hungary.
- Eötvös Loránd Research Network-ELTE Genetics Research Group, Budapest, Hungary.
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Komlós M, Szinyákovics J, Falcsik G, Sigmond T, Jezsó B, Vellai T, Kovács T. The Small-Molecule Enhancers of Autophagy AUTEN-67 and -99 Delay Ageing in Drosophila Striated Muscle Cells. Int J Mol Sci 2023; 24:ijms24098100. [PMID: 37175806 PMCID: PMC10179358 DOI: 10.3390/ijms24098100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 04/26/2023] [Accepted: 04/28/2023] [Indexed: 05/15/2023] Open
Abstract
Autophagy (cellular self-degradation) plays a major role in maintaining the functional integrity (homeostasis) of essentially all eukaryotic cells. During the process, superfluous and damaged cellular constituents are delivered into the lysosomal compartment for enzymatic degradation. In humans, age-related defects in autophagy have been linked to the incidence of various age-associated degenerative pathologies (e.g., cancer, neurodegenerative diseases, diabetes, tissue atrophy and fibrosis, and immune deficiency) and accelerated ageing. Muscle mass decreases at detectable levels already in middle-aged patients, and this change can increase up to 30-50% at age 80. AUTEN-67 and -99, two small-molecule enhancers of autophagy with cytoprotective and anti-ageing effects have been previously identified and initially characterized. These compounds can increase the life span in wild-type and neurodegenerative model strains of the fruit fly Drosophila melanogaster. Adult flies were treated with these AUTEN molecules via feeding. Fluorescence and electron microscopy and Western blotting were used to assess the level of autophagy and cellular senescence. Flying tests were used to measure the locomotor ability of the treated animals at different ages. In the current study, the effects of AUTEN-67 and -99 were observed on striated muscle cells using the Drosophila indirect flight muscle (IFM) as a model. The two molecules were capable of inducing autophagy in IFM cells, thereby lowering the accumulation of protein aggregates and damaged mitochondria, both characterizing muscle ageing. Furthermore, the two molecules significantly improved the flying ability of treated animals. AUTEN-67 and -99 decrease the rate at which striated muscle cells age. These results may have a significant medical relevance that could be further examined in mammalian models.
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Affiliation(s)
- Marcell Komlós
- Department of Genetics, ELTE Eötvös Loránd University, 1117 Budapest, Hungary
| | - Janka Szinyákovics
- Department of Genetics, ELTE Eötvös Loránd University, 1117 Budapest, Hungary
- MTA-ELTE Genetic Research Group, 1117 Budapest, Hungary
| | - Gergő Falcsik
- Department of Genetics, ELTE Eötvös Loránd University, 1117 Budapest, Hungary
| | - Tímea Sigmond
- Department of Genetics, ELTE Eötvös Loránd University, 1117 Budapest, Hungary
| | - Bálint Jezsó
- Department of Anatomy, Cell and Developmental Biology, ELTE Eötvös Loránd University, 1117 Budapest, Hungary
- Institute of Enzymology, Research Center for Natural Sciences, Eötvös Loránd Research Network, 1117 Budapest, Hungary
| | - Tibor Vellai
- Department of Genetics, ELTE Eötvös Loránd University, 1117 Budapest, Hungary
- MTA-ELTE Genetic Research Group, 1117 Budapest, Hungary
| | - Tibor Kovács
- Department of Genetics, ELTE Eötvös Loránd University, 1117 Budapest, Hungary
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Varga VB, Keresztes F, Sigmond T, Vellai T, Kovács T. The evolutionary and functional divergence of the Atg8 autophagy protein superfamily. Biol Futur 2022; 73:375-384. [PMID: 35731422 DOI: 10.1007/s42977-022-00123-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Accepted: 05/28/2022] [Indexed: 01/27/2023]
Abstract
Autophagy is a highly conserved self-degradation process of eukaryotic cells which is required for the effective elimination of damaged and unnecessary cytosolic constituents. Defects in the process can cause the intracellular accumulation of such damages, thereby leading to the senescence and subsequent loss of the affected cell. Defective autophagy hence is implicated in the development of various degenerative processes, including cancer, neurodegenerative diseases, diabetes, tissue atrophy and fibrosis, and immune deficiency, as well as in accelerated aging. The autophagic process is mediated by numerous autophagy-related (ATG) proteins, among which the ATG8/LC3/GABARAP (Microtubule-associated protein 1A/1B-light chain 3/Gammaaminobutyric acid receptor-associated protein) superfamily has a pivotal role in the formation and maturation of autophagosome, a key (macro) autophagic structure (the autophagosome sequesters parts of the cytoplasm which are destined for breakdown). While in the unicellular yeast there is only a single ATG8 protein, metazoan systems usually contain more ATG8 paralogs. ATG8 paralogs generally display tissue-specific expression patterns and their functions are not strictly restricted to autophagy. For example, GABARAP proteins also play a role in intracellular vesicle transport, and, in addition to autophagosome formation, ATG8 also functions in selective autophagy. In this review, we summarize the functional diversity of ATG8/LC3/GABARAP proteins, using tractable genetic models applied in autophagy research.
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Affiliation(s)
- Virginia B Varga
- Department of Genetics, Institute of Biology, ELTE Eötvös Loránd University, Pázmány Péter sétány 1/C, Budapest, H-1117, Hungary
| | - Fanni Keresztes
- Department of Genetics, Institute of Biology, ELTE Eötvös Loránd University, Pázmány Péter sétány 1/C, Budapest, H-1117, Hungary
| | - Tímea Sigmond
- Department of Genetics, Institute of Biology, ELTE Eötvös Loránd University, Pázmány Péter sétány 1/C, Budapest, H-1117, Hungary
| | - Tibor Vellai
- Department of Genetics, Institute of Biology, ELTE Eötvös Loránd University, Pázmány Péter sétány 1/C, Budapest, H-1117, Hungary.,ELKH-ELTE Genetics Research Group, Pázmány Péter sétány 1/C, Budapest, H-1117, Hungary
| | - Tibor Kovács
- Department of Genetics, Institute of Biology, ELTE Eötvös Loránd University, Pázmány Péter sétány 1/C, Budapest, H-1117, Hungary.
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Kovács D, Sigmond T, Hotzi B, Bohár B, Fazekas D, Deák V, Vellai T, Barna J. HSF1Base: A Comprehensive Database of HSF1 (Heat Shock Factor 1) Target Genes. Int J Mol Sci 2019; 20:ijms20225815. [PMID: 31752429 PMCID: PMC6888953 DOI: 10.3390/ijms20225815] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Revised: 11/11/2019] [Accepted: 11/15/2019] [Indexed: 12/28/2022] Open
Abstract
HSF1 (heat shock factor 1) is an evolutionarily conserved master transcriptional regulator of the heat shock response (HSR) in eukaryotic cells. In response to high temperatures, HSF1 upregulates genes encoding molecular chaperones, also called heat shock proteins, which assist the refolding or degradation of damaged intracellular proteins. Accumulating evidence reveals however that HSF1 participates in several other physiological and pathological processes such as differentiation, immune response, and multidrug resistance, as well as in ageing, neurodegenerative demise, and cancer. To address how HSF1 controls these processes one should systematically analyze its target genes. Here we present a novel database called HSF1Base (hsf1base.org) that contains a nearly comprehensive list of HSF1 target genes identified so far. The list was obtained by manually curating publications on individual HSF1 targets and analyzing relevant high throughput transcriptomic and chromatin immunoprecipitation data derived from the literature and the Yeastract database. To support the biological relevance of HSF1 targets identified by high throughput methods, we performed an enrichment analysis of (potential) HSF1 targets across different tissues/cell types and organisms. We found that general HSF1 functions (targets are expressed in all tissues/cell types) are mostly related to cellular proteostasis. Furthermore, HSF1 targets that are conserved across various animal taxa operate mostly in cellular stress pathways (e.g., autophagy), chromatin remodeling, ribosome biogenesis, and ageing. Together, these data highlight diverse roles for HSF1, expanding far beyond the HSR.
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Affiliation(s)
- Dániel Kovács
- Department of Genetics, Institute of Biology, Eötvös Loránd University, Pázmány Péter stny. 1/C, H-1117 Budapest, Hungary; (D.K.); (T.S.); (B.H.); (B.B.); (D.F.)
| | - Tímea Sigmond
- Department of Genetics, Institute of Biology, Eötvös Loránd University, Pázmány Péter stny. 1/C, H-1117 Budapest, Hungary; (D.K.); (T.S.); (B.H.); (B.B.); (D.F.)
| | - Bernadette Hotzi
- Department of Genetics, Institute of Biology, Eötvös Loránd University, Pázmány Péter stny. 1/C, H-1117 Budapest, Hungary; (D.K.); (T.S.); (B.H.); (B.B.); (D.F.)
| | - Balázs Bohár
- Department of Genetics, Institute of Biology, Eötvös Loránd University, Pázmány Péter stny. 1/C, H-1117 Budapest, Hungary; (D.K.); (T.S.); (B.H.); (B.B.); (D.F.)
- Earlham Institute, Norwich NR4 7UZ, UK
- Quadram Institute, Norwich NR4 7UA, UK
| | - Dávid Fazekas
- Department of Genetics, Institute of Biology, Eötvös Loránd University, Pázmány Péter stny. 1/C, H-1117 Budapest, Hungary; (D.K.); (T.S.); (B.H.); (B.B.); (D.F.)
- Earlham Institute, Norwich NR4 7UZ, UK
- Quadram Institute, Norwich NR4 7UA, UK
| | - Veronika Deák
- Department of Applied Biotechnology and Food Science, Laboratory of Biochemistry and Molecular Biology, University of Technology, H-1111 Budapest, Hungary;
| | - Tibor Vellai
- Department of Genetics, Institute of Biology, Eötvös Loránd University, Pázmány Péter stny. 1/C, H-1117 Budapest, Hungary; (D.K.); (T.S.); (B.H.); (B.B.); (D.F.)
- MTA-ELTE Genetics Research Group, Eötvös Loránd University, H-1117 Budapest, Hungary
- Correspondence: (T.V.); (J.B.); Tel.: +36-1-372-2500 (ext. 8684) (T.V.); +36-1-372-2500 (ext. 8349) (J.B.); Fax: +36-1-372-2641 (T.V.)
| | - János Barna
- Department of Genetics, Institute of Biology, Eötvös Loránd University, Pázmány Péter stny. 1/C, H-1117 Budapest, Hungary; (D.K.); (T.S.); (B.H.); (B.B.); (D.F.)
- MTA-ELTE Genetics Research Group, Eötvös Loránd University, H-1117 Budapest, Hungary
- Correspondence: (T.V.); (J.B.); Tel.: +36-1-372-2500 (ext. 8684) (T.V.); +36-1-372-2500 (ext. 8349) (J.B.); Fax: +36-1-372-2641 (T.V.)
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Erdélyi P, Borsos E, Takács-Vellai K, Kovács T, Kovács AL, Sigmond T, Hargitai B, Pásztor L, Sengupta T, Dengg M, Pécsi I, Tóth J, Nilsen H, Vértessy BG, Vellai T. Shared developmental roles and transcriptional control of autophagy and apoptosis in Caenorhabditis elegans. J Cell Sci 2011; 124:1510-8. [PMID: 21502138 DOI: 10.1242/jcs.080192] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Autophagy is a lysosome-mediated self-degradation process of eukaryotic cells that, depending on the cellular milieu, can either promote survival or act as an alternative mechanism of programmed cell death (PCD) in terminally differentiated cells. Despite the important developmental and medical implications of autophagy and the main form of PCD, apoptosis, orchestration of their regulation remains poorly understood. Here, we show in the nematode Caenorhabditis elegans, that various genetic and pharmacological interventions causing embryonic lethality trigger a massive cell death response that has both autophagic and apoptotic features. The two degradation processes are also redundantly required for normal development and viability in this organism. Furthermore, the CES-2-like basic region leucine-zipper (bZip) transcription factor ATF-2, an upstream modulator of the core apoptotic cell death pathway, is able to directly regulate the expression of at least two key autophagy-related genes, bec-1/ATG6 and lgg-1/ATG8. Thus, the two cell death mechanisms share a common method of transcriptional regulation. Together, these results imply that under certain physiological and pathological conditions, autophagy and apoptosis are co-regulated to ensure the proper morphogenesis and survival of the developing organism. The identification of apoptosis and autophagy as compensatory cellular pathways in C. elegans might help us to understand how dysregulated PCD in humans can lead to diverse pathologies, including cancer, neurodegeneration and diabetes.
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Affiliation(s)
- Péter Erdélyi
- Department of Genetics, Eötvös Loránd University, Budapest H-1117, Hungary
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Erdélyi P, Borsos É, Takács-Vellai K, Kovács T, Kovács AL, Sigmond T, Hargitai B, Pásztor L, SenGupta T, Dengg M, Pécsi I, Tóth J, Nilsen H, Vértessy BG, Vellai T. Shared developmental roles and transcriptional control of autophagy and apoptosis in Caenorhabditis elegans. Development 2011. [DOI: 10.1242/dev.068312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Tóth ML, Sigmond T, Borsos E, Barna J, Erdélyi P, Takács-Vellai K, Orosz L, Kovács AL, Csikós G, Sass M, Vellai T. Longevity pathways converge on autophagy genes to regulate life span in Caenorhabditis elegans. Autophagy 2008; 4:330-8. [PMID: 18219227 DOI: 10.4161/auto.5618] [Citation(s) in RCA: 313] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Aging is a multifactorial process with many mechanisms contributing to the decline. Mutations decreasing insulin/IGF-1 (insulin-like growth factor-1) or TOR (target of rapamycin) kinase-mediated signaling, mitochondrial activity and food intake each extend life span in divergent animal phyla. Understanding how these genetically distinct mechanisms interact to control longevity is a fundamental and fascinating problem in biology. Here we show that mutational inactivation of autophagy genes, which are involved in the degradation of aberrant, damaged cytoplasmic constituents accumulating in all aging cells, accelerates the rate at which the tissues age in the nematode Caenorhabditis elegans. According to our results Drosophila flies deficient in autophagy are also short-lived. We further demonstrate that reduced activity of autophagy genes suppresses life span extension in mutant nematodes with inherent dietary restriction, aberrant insulin/IGF-1 or TOR signaling, and lowered mitochondrial respiration. These findings suggest that the autophagy gene cascade functions downstream of and is inhibited by different longevity pathways in C. elegans, therefore, their effects converge on autophagy genes to slow down aging and lengthen life span. Thus, autophagy may act as a central regulatory mechanism of animal aging.
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Affiliation(s)
- Márton L Tóth
- Department of Genetics, Eötvös Loránd University, Budapest, Hungary
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Aladzsity I, Tóth ML, Sigmond T, Szabó E, Bicsák B, Barna J, Regos A, Orosz L, Kovács AL, Vellai T. Autophagy genes unc-51 and bec-1 are required for normal cell size in Caenorhabditis elegans. Genetics 2007; 177:655-60. [PMID: 17890369 PMCID: PMC2013693 DOI: 10.1534/genetics.107.075762] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Here we show that in the nematode Caenorhabditis elegans mutational inactivation of two autophagy genes unc-51/atg1 and bec-1/atg6/beclin1 results in small body size without affecting cell number. Furthermore, loss-of-function mutations in unc-51 and bec-1 suppress the giant phenotype of mutant animals with aberrant insulin-like growth factor-1 (insulin/IGF-1) or transforming growth factor-beta (TGF-beta) signaling. This function for unc-51 and bec-1 in cell size control and their interaction with these two growth modulatory pathways may represent a link between the hormonal and nutritional regulation of cell growth.
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Affiliation(s)
- István Aladzsity
- Department of Genetics, Eötvös Loránd University, Budapest, Hungary
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Sigmond R, Sigmond T, Goldman A, Goldman M. On the role of water in the aging of polymers in air-insulated electrical systems. ACTA ACUST UNITED AC 1991. [DOI: 10.1109/14.83701] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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