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Mulder T, Johnson J, González-Morales N. The filamins of Drosophila. Genome 2025; 68:1-11. [PMID: 39869855 DOI: 10.1139/gen-2024-0159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2025]
Abstract
The actin cytoskeleton is a dynamic mesh of filaments that provide structural support for cells and respond to external deformation forces. Active sensing of these forces is crucial for the function of the actin cytoskeleton, and some actin crosslinkers accomplish it. One such crosslinker is filamin, a highly conserved actin crosslinker dimeric protein with an elastic region capable of responding to mechanical changes in the actin cytoskeleton. Filamins are required across various cells and tissues. In Drosophila early and recent studies have provided many details about filamin functions. This review centers on the two Drosophila filamins encoded by the cheerio and jitterbu g genes. We examine the structural and evolutionary aspects of filamin genes in flies, contrasting them with those of other model organisms. Then, we synthesize phenotypic data across diverse cell types. Additionally, we outline the genetic tools available for both genes. We also propose to divide filamins into typical and atypical based on the number of actin-binding domains and their relationship with other filamins.
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Affiliation(s)
- Tiara Mulder
- Department of Biology, Dalhousie University, Halifax, NS, Canada
| | - Jennifer Johnson
- Department of Biology, Dalhousie University, Halifax, NS, Canada
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Wu J, Liu S, Jiang D, Zhou Y, Jiang H, Xiao X, Zha B, Fang Y, Huang J, Hu X, Mao H, Liu S, Chen B. Exploring Gene Expression and Alternative Splicing in Duck Embryonic Myoblasts via Full-Length Transcriptome Sequencing. Vet Sci 2024; 11:601. [PMID: 39728941 DOI: 10.3390/vetsci11120601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2024] [Revised: 11/19/2024] [Accepted: 11/24/2024] [Indexed: 12/28/2024] Open
Abstract
The duck industry is vital for supplying high-quality protein, making research into the development of duck skeletal muscle critical for improving meat and egg production. In this study, we leveraged Oxford Nanopore Technologies (ONT) sequencing to perform full-length transcriptome sequencing of myoblasts harvested from the leg muscles of duck embryos at embryonic day 13 (E13), specifically examining both the proliferative (GM) and differentiation (DM) phases. Our analysis identified a total of 5797 novel transcripts along with 2332 long non-coding RNAs (lncRNAs), revealing substantial changes in gene expression linked to muscle development. We detected 3653 differentially expressed genes and 2246 instances of alternative splicing, with key genes involved in essential pathways, such as ECM-receptor interaction and Notch signaling, prominently featured. Additionally, we constructed a protein-protein interaction network that highlighted critical regulators-MYOM3, MYL2, MYL1, TNNI2, and ACTN2-associated with the processes of proliferation and differentiation in myoblasts. This extensive transcriptomic investigation not only sheds light on the intricate molecular mechanisms driving skeletal muscle development in ducks but also provides significant insights for future breeding strategies aimed at enhancing the efficiency of duck production. The results emphasize the efficacy of ONT sequencing in uncovering complex regulatory networks within avian species, ultimately contributing to progress in animal husbandry.
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Affiliation(s)
- Jintao Wu
- College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang 330045, China
- Poultry Institute, Jiangxi Agricultural University, Nanchang 330045, China
| | - Shuibing Liu
- College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang 330045, China
- Poultry Institute, Jiangxi Agricultural University, Nanchang 330045, China
| | - Dongcheng Jiang
- College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang 330045, China
- Poultry Institute, Jiangxi Agricultural University, Nanchang 330045, China
| | - Ya'nan Zhou
- College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang 330045, China
- Poultry Institute, Jiangxi Agricultural University, Nanchang 330045, China
| | - Hongxia Jiang
- College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang 330045, China
- Poultry Institute, Jiangxi Agricultural University, Nanchang 330045, China
| | - Xiaoyun Xiao
- College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang 330045, China
- Poultry Institute, Jiangxi Agricultural University, Nanchang 330045, China
| | - Boqian Zha
- College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang 330045, China
| | - Yukai Fang
- College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang 330045, China
| | - Jie Huang
- College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang 330045, China
| | - Xiaolong Hu
- College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang 330045, China
- Poultry Institute, Jiangxi Agricultural University, Nanchang 330045, China
| | - Huirong Mao
- College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang 330045, China
- Poultry Institute, Jiangxi Agricultural University, Nanchang 330045, China
| | - Sanfeng Liu
- College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang 330045, China
- Poultry Institute, Jiangxi Agricultural University, Nanchang 330045, China
| | - Biao Chen
- College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang 330045, China
- Poultry Institute, Jiangxi Agricultural University, Nanchang 330045, China
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Khan B, Lanzuolo C, Rosti V, Santarelli P, Pich A, Kraft T, Amrute-Nayak M, Nayak A. Sorafenib induces cachexia by impeding transcriptional signaling of the SET1/MLL complex on muscle-specific genes. iScience 2024; 27:110913. [PMID: 39386761 PMCID: PMC11462028 DOI: 10.1016/j.isci.2024.110913] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2024] [Revised: 06/27/2024] [Accepted: 09/06/2024] [Indexed: 10/12/2024] Open
Abstract
Chemotherapeutics used in cancer therapy are often linked to muscle wasting or cachexia. Insights into the molecular basis of chemotherapy-induced cachexia is essential to improve treatment strategies. Here, we demonstrated that Sorafenib-tyrosine kinase inhibitor (TKI) class of chemotherapeutic agents-induced cachexia. System-wide analyses revealed that Sorafenib alters the global transcriptional program and proteostasis in muscle cells. Mechanistically, Sorafenib treatment reduced active epigenetic mark H3K4 methylation on distinct muscle-specific genes by impeding chromatin association of SET1A-catalytic component of the SET1/MLL histone methyltransferase complex. This mechanism favored transcriptional disorientation that led to disrupted sarcomere assembly, calcium homeostasis and mitochondrial respiration. Consequently, the contractile ability of muscle cells was severely compromised. Interestingly, the other prominent TKIs Nilotinib and Imatinib did not exert similar effects on muscle cell physiology. Collectively, we identified an unanticipated transcriptional mechanism underlying Sorafenib-induced cachexia. Our findings hold the potential to strategize therapy regimens to minimize chemotherapy-induced cachexia.
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Affiliation(s)
- Bushra Khan
- Institute of Molecular and Cell Physiology, Hannover Medical School, Hannover, Germany
| | - Chiara Lanzuolo
- Istituto Nazionale Genetica Molecolare ‘Romeo ed Enrica Invernizzi’, Milan, Italy
- Institute of Biomedical Technologies, National Research Council, Milan, Italy
| | - Valentina Rosti
- Istituto Nazionale Genetica Molecolare ‘Romeo ed Enrica Invernizzi’, Milan, Italy
- Institute of Biomedical Technologies, National Research Council, Milan, Italy
| | - Philina Santarelli
- Istituto Nazionale Genetica Molecolare ‘Romeo ed Enrica Invernizzi’, Milan, Italy
- Institute of Biomedical Technologies, National Research Council, Milan, Italy
| | - Andreas Pich
- Institute of Toxicology, Core Facility Proteomics, Hannover Medical School, Hannover, Germany
| | - Theresia Kraft
- Institute of Molecular and Cell Physiology, Hannover Medical School, Hannover, Germany
| | - Mamta Amrute-Nayak
- Institute of Molecular and Cell Physiology, Hannover Medical School, Hannover, Germany
| | - Arnab Nayak
- Institute of Molecular and Cell Physiology, Hannover Medical School, Hannover, Germany
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Michael AH, Hana TA, Mousa VG, Ormerod KG. Muscle-fiber specific genetic manipulation of Drosophila sallimus severely impacts neuromuscular development, morphology, and physiology. Front Physiol 2024; 15:1429317. [PMID: 39351283 PMCID: PMC11439786 DOI: 10.3389/fphys.2024.1429317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2024] [Accepted: 08/29/2024] [Indexed: 10/04/2024] Open
Abstract
The ability of skeletal muscles to contract is derived from the unique genes and proteins expressed within muscles, most notably myofilaments and elastic proteins. Here we investigated the role of the sallimus (sls) gene, which encodes a structural homologue of titin, in regulating development, structure, and function of Drosophila melanogaster. Knockdown of sls using RNA interference (RNAi) in all body-wall muscle fibers resulted in embryonic lethality. A screen for muscle-specific drivers revealed a Gal4 line that expresses in a single larval body wall muscle in each abdominal hemisegment. Disrupting sls expression in single muscle fibers did not impact egg or larval viability nor gross larval morphology but did significantly alter the morphology of individual muscle fibers. Ultrastructural analysis of individual muscles revealed significant changes in organization. Surprisingly, muscle-cell specific disruption of sls also severely impacted neuromuscular junction (NMJ) formation. The extent of motor-neuron (MN) innervation along disrupted muscles was significantly reduced along with the number of glutamatergic boutons, in MN-Is and MN-Ib. Electrophysiological recordings revealed a 40% reduction in excitatory junctional potentials correlating with the extent of motor neuron loss. Analysis of active zone (AZ) composition revealed changes in presynaptic scaffolding protein (brp) abundance, but no changes in postsynaptic glutamate receptors. Ultrastructural changes in muscle and NMJ development at these single muscle fibers were sufficient to lead to observable changes in neuromuscular transduction and ultimately, locomotory behavior. Collectively, the data demonstrate that sls mediates critical aspects of muscle and NMJ development and function, illuminating greater roles for sls/titin.
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Affiliation(s)
| | | | | | - Kiel G. Ormerod
- Department of Biology, Middle Tennessee State University, Murfreesboro, TN, United States
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Kong L, Yuan C, Guo T, Sun L, Liu J, Lu Z. Inhibitor of Myom3 inhibits proliferation and promotes differentiation of sheep myoblasts. Genomics 2024; 116:110921. [PMID: 39173892 DOI: 10.1016/j.ygeno.2024.110921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2024] [Revised: 07/31/2024] [Accepted: 08/19/2024] [Indexed: 08/24/2024]
Abstract
Skeletal muscle quality and yield are important production traits in livestock, and improving skeletal muscle quality while increasing its yield is an important goal of economic breeding. The proliferation and differentiation process of sheep myoblasts directly affects the growth and development of their muscles, thereby affecting the yield of mutton. Myomesin 3 (Myom3), as a functional gene related to muscle growth, currently lacks research on its function in myoblasts. This study aims to investigate the effect of the Myom3 gene on the proliferation and differentiation of sheep myoblasts and its potential molecular mechanisms. The results showed that inhibitor of Myom3 in the proliferation phase of myoblasts resulted in significant downregulation of the proliferation marker gene paired box 7 (Pax7) and myogenic regulatory factors (MRFs; Myf5, Myod1, Myog, P < 0.01), a significant decrease in the EdU-positive cell rate (P < 0.05), and a significant increase in the cell apoptosis rate (P < 0.01), which inhibited the proliferation of myoblasts and promoted their apoptosis. During the differentiation phase of myoblasts, the inhibitor of Myom3 resulted in significant downregulation of the Pax7 gene, upregulation of MRFs (Myod1, Myog, P < 0.05), and a significant increase in fusion index (P < 0.05), promoting the differentiation of myoblasts. Further transcriptome sequencing revealed that differentially expressed genes in the Myom3 interference group were mainly enriched in the MAPK signaling pathway, TNF signaling pathway, and IL-17 signaling pathway. In summary, the inhibitor of Myom3 inhibits myoblast proliferation and promotes myoblast differentiation. Therefore, Myom3 has a potential regulatory effect on the growth and development of sheep muscles, and in-depth functional research can be used for molecular breeding practices in sheep.
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Affiliation(s)
- Lingying Kong
- Key Laboratory of Animal Genetics and Breeding on the Tibetan Plateau, Ministry of Agriculture and Rural Affairs, Lanzhou Institute of Husbandry and Pharmaceutical Sciences, Chinese Academy of Agricultural Sciences, Lanzhou 730050, China; Sheep Breeding Engineering Technology Research Center of Chinese Academy of Agricultural Sciences, Lanzhou 730050, China
| | - Chao Yuan
- Key Laboratory of Animal Genetics and Breeding on the Tibetan Plateau, Ministry of Agriculture and Rural Affairs, Lanzhou Institute of Husbandry and Pharmaceutical Sciences, Chinese Academy of Agricultural Sciences, Lanzhou 730050, China; Sheep Breeding Engineering Technology Research Center of Chinese Academy of Agricultural Sciences, Lanzhou 730050, China
| | - Tingting Guo
- Key Laboratory of Animal Genetics and Breeding on the Tibetan Plateau, Ministry of Agriculture and Rural Affairs, Lanzhou Institute of Husbandry and Pharmaceutical Sciences, Chinese Academy of Agricultural Sciences, Lanzhou 730050, China; Sheep Breeding Engineering Technology Research Center of Chinese Academy of Agricultural Sciences, Lanzhou 730050, China
| | - Lixia Sun
- Key Laboratory of Animal Genetics and Breeding on the Tibetan Plateau, Ministry of Agriculture and Rural Affairs, Lanzhou Institute of Husbandry and Pharmaceutical Sciences, Chinese Academy of Agricultural Sciences, Lanzhou 730050, China; Sheep Breeding Engineering Technology Research Center of Chinese Academy of Agricultural Sciences, Lanzhou 730050, China
| | - Jianbin Liu
- Key Laboratory of Animal Genetics and Breeding on the Tibetan Plateau, Ministry of Agriculture and Rural Affairs, Lanzhou Institute of Husbandry and Pharmaceutical Sciences, Chinese Academy of Agricultural Sciences, Lanzhou 730050, China; Sheep Breeding Engineering Technology Research Center of Chinese Academy of Agricultural Sciences, Lanzhou 730050, China.
| | - Zengkui Lu
- Key Laboratory of Animal Genetics and Breeding on the Tibetan Plateau, Ministry of Agriculture and Rural Affairs, Lanzhou Institute of Husbandry and Pharmaceutical Sciences, Chinese Academy of Agricultural Sciences, Lanzhou 730050, China; Sheep Breeding Engineering Technology Research Center of Chinese Academy of Agricultural Sciences, Lanzhou 730050, China.
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Farkas D, Szikora S, Jijumon AS, Polgár TF, Patai R, Tóth MÁ, Bugyi B, Gajdos T, Bíró P, Novák T, Erdélyi M, Mihály J. Peripheral thickening of the sarcomeres and pointed end elongation of the thin filaments are both promoted by SALS and its formin interaction partners. PLoS Genet 2024; 20:e1011117. [PMID: 38198522 PMCID: PMC10805286 DOI: 10.1371/journal.pgen.1011117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2023] [Revised: 01/23/2024] [Accepted: 12/27/2023] [Indexed: 01/12/2024] Open
Abstract
During striated muscle development the first periodically repeated units appear in the premyofibrils, consisting of immature sarcomeres that must undergo a substantial growth both in length and width, to reach their final size. Here we report that, beyond its well established role in sarcomere elongation, the Sarcomere length short (SALS) protein is involved in Z-disc formation and peripheral growth of the sarcomeres. Our protein localization data and loss-of-function studies in the Drosophila indirect flight muscle strongly suggest that radial growth of the sarcomeres is initiated at the Z-disc. As to thin filament elongation, we used a powerful nanoscopy approach to reveal that SALS is subject to a major conformational change during sarcomere development, which might be critical to stop pointed end elongation in the adult muscles. In addition, we demonstrate that the roles of SALS in sarcomere elongation and radial growth are both dependent on formin type of actin assembly factors. Unexpectedly, when SALS is present in excess amounts, it promotes the formation of actin aggregates highly resembling the ones described in nemaline myopathy patients. Collectively, these findings helped to shed light on the complex mechanisms of SALS during the coordinated elongation and thickening of the sarcomeres, and resulted in the discovery of a potential nemaline myopathy model, suitable for the identification of genetic and small molecule inhibitors.
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Affiliation(s)
- Dávid Farkas
- Institute of Genetics, Biological Research Centre, Szeged, Hungary
| | - Szilárd Szikora
- Institute of Genetics, Biological Research Centre, Szeged, Hungary
| | - A. S. Jijumon
- Institute of Genetics, Biological Research Centre, Szeged, Hungary
| | - Tamás F. Polgár
- Institute of Biophysics, Biological Research Centre, Szeged, Hungary
- Doctoral School of Theoretical Medicine, University of Szeged, Szeged, Hungary
| | - Roland Patai
- Institute of Biophysics, Biological Research Centre, Szeged, Hungary
| | - Mónika Ágnes Tóth
- University of Pécs, Medical School, Department of Biophysics, Pécs, Hungary
| | - Beáta Bugyi
- University of Pécs, Medical School, Department of Biophysics, Pécs, Hungary
| | - Tamás Gajdos
- Department of Optics and Quantum Electronics, University of Szeged, Szeged, Hungary
| | - Péter Bíró
- Department of Optics and Quantum Electronics, University of Szeged, Szeged, Hungary
| | - Tibor Novák
- Department of Optics and Quantum Electronics, University of Szeged, Szeged, Hungary
| | - Miklós Erdélyi
- Department of Optics and Quantum Electronics, University of Szeged, Szeged, Hungary
| | - József Mihály
- Institute of Genetics, Biological Research Centre, Szeged, Hungary
- University of Szeged, Department of Genetics, Szeged, Hungary
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