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van der Graaf K, Srivastav S, Nishad R, Stern M, McNew JA. The Drosophila Nesprin-1 homolog MSP300 is required for muscle autophagy and proteostasis. J Cell Sci 2024; 137:jcs262096. [PMID: 38757366 PMCID: PMC11213522 DOI: 10.1242/jcs.262096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2024] [Accepted: 05/13/2024] [Indexed: 05/18/2024] Open
Abstract
Nesprin proteins, which are components of the linker of nucleoskeleton and cytoskeleton (LINC) complex, are located within the nuclear envelope and play prominent roles in nuclear architecture. For example, LINC complex proteins interact with both chromatin and the cytoskeleton. Here, we report that the Drosophila Nesprin MSP300 has an additional function in autophagy within larval body wall muscles. RNAi-mediated MSP300 knockdown in larval body wall muscles resulted in defects in the contractile apparatus, muscle degeneration and defective autophagy. In particular, MSP300 knockdown caused accumulation of cytoplasmic aggregates that contained poly-ubiquitylated cargo, as well as the autophagy receptor ref(2)P (the fly homolog of p62 or SQSTM) and Atg8a. Furthermore, MSP300 knockdown larvae expressing an mCherry-GFP-tagged Atg8a transgene exhibited aberrant persistence of the GFP signal within these aggregates, indicating failure of autophagosome maturation. These autophagy deficits were similar to those exhibited by loss of the endoplasmic reticulum (ER) fusion protein Atlastin (Atl), raising the possibility that Atl and MSP300 might function in the same pathway. In support of this possibility, we found that a GFP-tagged MSP300 protein trap exhibited extensive localization to the ER. Alteration of ER-directed MSP300 might abrogate important cytoskeletal contacts necessary for autophagosome completion.
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Affiliation(s)
| | | | - Rajkishor Nishad
- Department of BioSciences, Rice University, Houston, TX 77005, USA
| | - Michael Stern
- Department of BioSciences, Rice University, Houston, TX 77005, USA
| | - James A. McNew
- Department of BioSciences, Rice University, Houston, TX 77005, USA
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Zhang Y, Fan X, Zang H, Liu X, Feng P, Ye D, Zhu L, Wu Y, Jiang H, Chen D, Guo R. Novel Insights into the circRNA-Modulated Developmental Mechanism of Western Honey Bee Larval Guts. INSECTS 2023; 14:897. [PMID: 37999096 PMCID: PMC10671861 DOI: 10.3390/insects14110897] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Revised: 11/10/2023] [Accepted: 11/18/2023] [Indexed: 11/25/2023]
Abstract
Circular RNAs (circRNAs) are a class of novel non-coding RNAs (ncRNAs) that play essential roles in the development and growth of vertebrates through multiple manners. However, the mechanism by which circRNAs modulate the honey bee gut development is currently poorly understood. Utilizing the transcriptome data we obtained earlier, the highly expressed circRNAs in the Apis mellifera worker 4-, 5-, and 6-day-old larval guts were analyzed, which was followed by an in-depth investigation of the expression pattern of circRNAs during the process of larval guts development and the potential regulatory roles of differentially expressed circRNAs (DEcircRNAs). In total, 1728 expressed circRNAs were detected in the A. mellifera larval guts. Among the most highly expressed 10 circRNAs, seven (novel_circ_000069, novel_circ_000027, novel_circ_000438, etc.) were shared by the 4-, 5-, and 6-day-old larval guts. In addition, 21 (46) up-regulated and 22 (27) down-regulated circRNAs were, respectively, screened in the Am4 vs. Am5 (Am5 vs. Am6) comparison groups. Additionally, nine DEcircRNAs, such as novel_circ_000340, novel_circ_000758 and novel_circ_001116, were shared by these two comparison groups. These DEcircRNAs were predicted to be transcribed from 14 and 29 parental genes; these were respectively annotated to 15 and 22 GO terms such as biological regulation and catalytic activity as well as 16 and 21 KEGG pathways such as dorsoventral axis formation and apoptosis. Moreover, a complicated competing endogenous RNA (ceRNA) network was observed; novel_circ_000838 in the Am4 vs. Am5 comparison group potentially targeted ame-miR-6000a-3p, further targeting 518 mRNAs engaged in several developmental signaling pathways (e.g., TGF-beta, hedgehog, and wnt signaling pathway) and immune pathways (e.g., phagosome, lysosome, and MAPK signaling pathway). The results demonstrated that the novel_circ_000838-ame-miR-6000a-3p axis may plays a critical regulatory part in the larval gut development and immunity. Furthermore, back-splicing sites of six randomly selected DEcircRNAs were amplified and verified by PCR; an RT-qPCR assay of these six DEcircRNAs confirmed the reliability of the used high-throughput sequencing data. Our findings provide a novel insight into the honey bee gut development and pave a way for illustration of the circRNA-modulated developmental mechanisms underlying the A. mellifera worker larval guts.
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Affiliation(s)
- Yiqiong Zhang
- College of Animal Sciences (College of Bee Science), Fujian Agriculture and Forestry University, Fuzhou 350002, China; (Y.Z.); (X.F.); (H.Z.); (X.L.); (P.F.); (D.Y.); (L.Z.); (D.C.)
| | - Xiaoxue Fan
- College of Animal Sciences (College of Bee Science), Fujian Agriculture and Forestry University, Fuzhou 350002, China; (Y.Z.); (X.F.); (H.Z.); (X.L.); (P.F.); (D.Y.); (L.Z.); (D.C.)
- National & Local United Engineering Laboratory of Natural Biotoxin, Fuzhou 350002, China
- Apitherapy Research Institute of Fujian Province, Fuzhou 350002, China
| | - He Zang
- College of Animal Sciences (College of Bee Science), Fujian Agriculture and Forestry University, Fuzhou 350002, China; (Y.Z.); (X.F.); (H.Z.); (X.L.); (P.F.); (D.Y.); (L.Z.); (D.C.)
- National & Local United Engineering Laboratory of Natural Biotoxin, Fuzhou 350002, China
- Apitherapy Research Institute of Fujian Province, Fuzhou 350002, China
| | - Xiaoyu Liu
- College of Animal Sciences (College of Bee Science), Fujian Agriculture and Forestry University, Fuzhou 350002, China; (Y.Z.); (X.F.); (H.Z.); (X.L.); (P.F.); (D.Y.); (L.Z.); (D.C.)
| | - Peilin Feng
- College of Animal Sciences (College of Bee Science), Fujian Agriculture and Forestry University, Fuzhou 350002, China; (Y.Z.); (X.F.); (H.Z.); (X.L.); (P.F.); (D.Y.); (L.Z.); (D.C.)
| | - Daoyou Ye
- College of Animal Sciences (College of Bee Science), Fujian Agriculture and Forestry University, Fuzhou 350002, China; (Y.Z.); (X.F.); (H.Z.); (X.L.); (P.F.); (D.Y.); (L.Z.); (D.C.)
| | - Leran Zhu
- College of Animal Sciences (College of Bee Science), Fujian Agriculture and Forestry University, Fuzhou 350002, China; (Y.Z.); (X.F.); (H.Z.); (X.L.); (P.F.); (D.Y.); (L.Z.); (D.C.)
| | - Ying Wu
- Jilin Institute of Apicultural Research, Jilin 132013, China; (Y.W.); (H.J.)
| | - Haibin Jiang
- Jilin Institute of Apicultural Research, Jilin 132013, China; (Y.W.); (H.J.)
| | - Dafu Chen
- College of Animal Sciences (College of Bee Science), Fujian Agriculture and Forestry University, Fuzhou 350002, China; (Y.Z.); (X.F.); (H.Z.); (X.L.); (P.F.); (D.Y.); (L.Z.); (D.C.)
- National & Local United Engineering Laboratory of Natural Biotoxin, Fuzhou 350002, China
- Apitherapy Research Institute of Fujian Province, Fuzhou 350002, China
| | - Rui Guo
- College of Animal Sciences (College of Bee Science), Fujian Agriculture and Forestry University, Fuzhou 350002, China; (Y.Z.); (X.F.); (H.Z.); (X.L.); (P.F.); (D.Y.); (L.Z.); (D.C.)
- National & Local United Engineering Laboratory of Natural Biotoxin, Fuzhou 350002, China
- Apitherapy Research Institute of Fujian Province, Fuzhou 350002, China
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van der Graaf K, Srivastav S, Singh P, McNew JA, Stern M. The Drosophila melanogaster attP40 docking site and derivatives are insertion mutations of msp-300. PLoS One 2022; 17:e0278598. [PMID: 36516171 PMCID: PMC9750024 DOI: 10.1371/journal.pone.0278598] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Accepted: 11/19/2022] [Indexed: 12/15/2022] Open
Abstract
The ɸC31 integrase system is widely used in Drosophila melanogaster to allow transgene targeting to specific loci. Over the years, flies bearing any of more than 100 attP docking sites have been constructed. One popular docking site, termed attP40, is located close to the Nesprin-1 orthologue msp-300 and lies upstream of certain msp-300 isoforms and within the first intron of others. Here we show that attP40 causes larval muscle nuclear clustering, which is a phenotype also conferred by msp-300 mutations. We also show that flies bearing insertions within attP40 can exhibit decreased msp-300 transcript levels in third instar larvae. Finally, chromosomes carrying certain "transgenic RNAi project" (TRiP) insertions into attP40 can confer pupal or adult inviability or infertility, or dominant nuclear clustering effects in certain genetic backgrounds. These phenotypes do not require transcription from the insertions within attP40. These results demonstrate that attP40 and insertion derivatives act as msp-300 insertional mutations. These findings should be considered when interpreting data from attP40-bearing flies.
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Affiliation(s)
- Kevin van der Graaf
- Department of Biosciences, Program in Biochemistry and Cell Biology, Rice University, Houston, Texas, United States of America
| | - Saurabh Srivastav
- Department of Biosciences, Program in Biochemistry and Cell Biology, Rice University, Houston, Texas, United States of America
| | - Pratibha Singh
- Department of Biosciences, Program in Biochemistry and Cell Biology, Rice University, Houston, Texas, United States of America
| | - James A. McNew
- Department of Biosciences, Program in Biochemistry and Cell Biology, Rice University, Houston, Texas, United States of America
| | - Michael Stern
- Department of Biosciences, Program in Biochemistry and Cell Biology, Rice University, Houston, Texas, United States of America
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