1
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Wahiduzzaman, Tindell SJ, Alexander E, Hackney E, Kharel K, Schmidtke R, Arkov AL. Drosophila germ granules are assembled from protein components through different modes of competing interactions with the multi-domain Tudor protein. FEBS Lett 2024; 598:774-786. [PMID: 38499396 DOI: 10.1002/1873-3468.14846] [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: 09/06/2023] [Revised: 12/21/2023] [Accepted: 02/14/2024] [Indexed: 03/20/2024]
Abstract
Membraneless organelles are RNA-protein assemblies which have been implicated in post-transcriptional control. Germ cells form membraneless organelles referred to as germ granules, which contain conserved proteins including Tudor domain-containing scaffold polypeptides and their partner proteins that interact with Tudor domains. Here, we show that in Drosophila, different germ granule proteins associate with the multi-domain Tudor protein using different numbers of Tudor domains. Furthermore, these proteins compete for interaction with Tudor in vitro and, surprisingly, partition to distinct and poorly overlapping clusters in germ granules in vivo. This partition results in minimization of the competition. Our data suggest that Tudor forms structurally different configurations with different partner proteins which dictate different biophysical properties and phase separation parameters within the same granule.
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Affiliation(s)
- Wahiduzzaman
- Department of Biological Sciences, Murray State University, KY, USA
| | - Samuel J Tindell
- Department of Biological Sciences, Murray State University, KY, USA
| | - Emma Alexander
- Department of Biological Sciences, Murray State University, KY, USA
| | - Ethan Hackney
- Department of Biological Sciences, Murray State University, KY, USA
| | - Kabita Kharel
- Department of Biological Sciences, Murray State University, KY, USA
| | - Ryan Schmidtke
- Department of Biological Sciences, Murray State University, KY, USA
| | - Alexey L Arkov
- Department of Biological Sciences, Murray State University, KY, USA
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2
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Kara E, McCambridge A, Proffer M, Dilts C, Pumnea B, Eshak J, Smith KA, Fielder I, Doyle DA, Ortega BM, Mukatash Y, Malik N, Mohammed AR, Govani D, Niepielko MG, Gao M. Mutational analysis of the functional motifs of the DEAD-box RNA helicase Me31B/DDX6 in Drosophila germline development. FEBS Lett 2023; 597:1848-1867. [PMID: 37235728 PMCID: PMC10389067 DOI: 10.1002/1873-3468.14668] [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: 01/30/2023] [Revised: 04/24/2023] [Accepted: 05/16/2023] [Indexed: 05/28/2023]
Abstract
Me31B/DDX6 is a DEAD-box family RNA helicase playing roles in post-transcriptional RNA regulation in different cell types and species. Despite the known motifs/domains of Me31B, the in vivo functions of the motifs remain unclear. Here, we used the Drosophila germline as a model and used CRISPR to mutate the key Me31B motifs/domains: helicase domain, N-terminal domain, C-terminal domain and FDF-binding motif. Then, we performed screening characterization on the mutants and report the effects of the mutations on the Drosophila germline, on processes such as fertility, oogenesis, embryo patterning, germline mRNA regulation and Me31B protein expression. The study indicates that the Me31B motifs contribute different functions to the protein and are needed for proper germline development, providing insights into the in vivo working mechanism of the helicase.
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Affiliation(s)
- Evan Kara
- Biology Department, Indiana University Northwest, Gary, IN, USA
| | | | - Megan Proffer
- Biology Department, Indiana University Northwest, Gary, IN, USA
| | - Carol Dilts
- Biology Department, Indiana University Northwest, Gary, IN, USA
| | - Brooke Pumnea
- Biology Department, Indiana University Northwest, Gary, IN, USA
| | - John Eshak
- Biology Department, Indiana University Northwest, Gary, IN, USA
| | - Korey A. Smith
- Biology Department, Indiana University Northwest, Gary, IN, USA
| | - Isaac Fielder
- Biology Department, Indiana University Northwest, Gary, IN, USA
| | - Dominique A. Doyle
- School of Integrative Science and Technology, Kean University, Union, NJ, USA
| | - Bianca M. Ortega
- School of Integrative Science and Technology, Kean University, Union, NJ, USA
| | - Yousif Mukatash
- Biology Department, Indiana University Northwest, Gary, IN, USA
| | - Noor Malik
- Biology Department, Indiana University Northwest, Gary, IN, USA
| | | | - Deep Govani
- Biology Department, Indiana University Northwest, Gary, IN, USA
| | - Matthew G. Niepielko
- School of Integrative Science and Technology, Kean University, Union, NJ, USA
- Biology Department, Kean University, Union, NJ, USA
| | - Ming Gao
- Biology Department, Indiana University Northwest, Gary, IN, USA
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3
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Tindell SJ, Rouchka EC, Arkov AL. Glial granules contain germline proteins in the Drosophila brain, which regulate brain transcriptome. Commun Biol 2020; 3:699. [PMID: 33219296 PMCID: PMC7679405 DOI: 10.1038/s42003-020-01432-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2020] [Accepted: 10/23/2020] [Indexed: 01/23/2023] Open
Abstract
Membraneless RNA-protein granules play important roles in many different cell types and organisms. In particular, granules found in germ cells have been used as a paradigm to study large and dynamic granules. These germ granules contain RNA and proteins required for germline development. Here, we unexpectedly identify large granules in specific subtypes of glial cells ("glial granules") of the adult Drosophila brain which contain polypeptides with previously characterized roles in germ cells including scaffold Tudor, Vasa, Polar granule component and Piwi family proteins. Interestingly, our super-resolution microscopy analysis shows that in the glial granules, these proteins form distinct partially overlapping clusters. Furthermore, we show that glial granule scaffold protein Tudor functions in silencing of transposable elements and in small regulatory piRNA biogenesis. Remarkably, our data indicate that the adult brain contains a small population of cells, which express both neuroblast and germ cell proteins. These distinct cells are evolutionarily conserved and expand during aging suggesting the existence of age-dependent signaling. Our work uncovers previously unknown glial granules and indicates the involvement of their components in the regulation of brain transcriptome.
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Affiliation(s)
- Samuel J Tindell
- Department of Biological Sciences, Murray State University, Murray, KY, 42071, USA
| | - Eric C Rouchka
- Computer Science and Engineering Department, University of Louisville, Louisville, KY, 40292, USA
| | - Alexey L Arkov
- Department of Biological Sciences, Murray State University, Murray, KY, 42071, USA.
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4
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Comparative Proteomics Reveal Me31B's Interactome Dynamics, Expression Regulation, and Assembly Mechanism into Germ Granules during Drosophila Germline Development. Sci Rep 2020; 10:564. [PMID: 31953495 PMCID: PMC6969142 DOI: 10.1038/s41598-020-57492-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Accepted: 12/26/2019] [Indexed: 01/23/2023] Open
Abstract
Me31B is a protein component of Drosophila germ granules and plays an important role in germline development by interacting with other proteins and RNAs. To understand the dynamic changes that the Me31B interactome undergoes from oogenesis to early embryogenesis, we characterized the early embryo Me31B interactome and compared it to the known ovary interactome. The two interactomes shared RNA regulation proteins, glycolytic enzymes, and cytoskeleton/motor proteins, but the core germ plasm proteins Vas, Tud, and Aub were significantly decreased in the embryo interactome. Our follow-up on two RNA regulations proteins present in both interactomes, Tral and Cup, revealed that they colocalize with Me31B in nuage granules, P-bodies/sponge bodies, and possibly in germ plasm granules. We further show that Tral and Cup are both needed for maintaining Me31B protein level and mRNA stability, with Tral’s effect being more specific. In addition, we provide evidence that Me31B likely colocalizes and interacts with germ plasm marker Vas in the ovaries and early embryo germ granules. Finally, we show that Me31B’s localization in germ plasm is likely independent of the Osk-Vas-Tud-Aub germ plasm assembly pathway although its proper enrichment in the germ plasm may still rely on certain conserved germ plasm proteins.
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5
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Vo HDL, Wahiduzzaman, Tindell SJ, Zheng J, Gao M, Arkov AL. Protein components of ribonucleoprotein granules from Drosophila germ cells oligomerize and show distinct spatial organization during germline development. Sci Rep 2019; 9:19190. [PMID: 31844131 PMCID: PMC6915754 DOI: 10.1038/s41598-019-55747-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Accepted: 11/28/2019] [Indexed: 01/11/2023] Open
Abstract
The assembly of large RNA-protein granules occurs in germ cells of many animals and these germ granules have provided a paradigm to study structure-functional aspects of similar structures in different cells. Germ granules in Drosophila oocyte’s posterior pole (polar granules) are composed of RNA, in the form of homotypic clusters, and proteins required for germline development. In the granules, Piwi protein Aubergine binds to a scaffold protein Tudor, which contains 11 Tudor domains. Using a super-resolution microscopy, we show that surprisingly, Aubergine and Tudor form distinct clusters within the same polar granules in early Drosophila embryos. These clusters partially overlap and, after germ cells form, they transition into spherical granules with the structural organization unexpected from these interacting proteins: Aubergine shell around the Tudor core. Consistent with the formation of distinct clusters, we show that Aubergine forms homo-oligomers and using all purified Tudor domains, we demonstrate that multiple domains, distributed along the entire Tudor structure, interact with Aubergine. Our data suggest that in polar granules, Aubergine and Tudor are assembled into distinct phases, partially mixed at their “interaction hubs”, and that association of distinct protein clusters may be an evolutionarily conserved mechanism for the assembly of germ granules.
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Affiliation(s)
- Hieu D L Vo
- Department of Biological Sciences, Murray State University, Murray, KY, 42071, USA
| | - Wahiduzzaman
- Department of Biological Sciences, Murray State University, Murray, KY, 42071, USA
| | - Samuel J Tindell
- Department of Biological Sciences, Murray State University, Murray, KY, 42071, USA
| | - Jimiao Zheng
- Department of Biological Sciences, Murray State University, Murray, KY, 42071, USA
| | - Ming Gao
- Biology Department, Indiana University Northwest, Gary, IN, 46408, USA
| | - Alexey L Arkov
- Department of Biological Sciences, Murray State University, Murray, KY, 42071, USA.
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6
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DeHaan H, McCambridge A, Armstrong B, Cruse C, Solanki D, Trinidad JC, Arkov AL, Gao M. An in vivo proteomic analysis of the Me31B interactome in Drosophila germ granules. FEBS Lett 2017; 591:3536-3547. [PMID: 28945271 DOI: 10.1002/1873-3468.12854] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2017] [Revised: 09/07/2017] [Accepted: 09/15/2017] [Indexed: 12/11/2022]
Abstract
Drosophila Me31B is a conserved protein of germ granules, ribonucleoprotein complexes essential for germ cell development. Me31B post-transcriptionally regulates mRNAs by interacting with other germ granule proteins. However, a Me31B interactome is lacking. Here, we use an in vivo proteomics approach to show that the Me31B interactome contains polypeptides from four functional groups: RNA regulatory proteins, glycolytic enzymes, cytoskeleton/motor proteins, and germ plasm components. We further show that Me31B likely colocalizes with the germ plasm components Tudor (Tud), Vasa, and Aubergine in the nuage and germ plasm and provide evidence that Me31B may directly bind to Tud in a symmetrically dimethylated arginine-dependent manner. Our study supports the role of Me31B in RNA regulation and suggests its novel roles in germ granule assembly and function.
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Affiliation(s)
- Hunter DeHaan
- Biology Department, Indiana University Northwest, Gary, IN, USA
| | | | | | - Carlie Cruse
- Biology Department, Indiana University Northwest, Gary, IN, USA
| | - Dhruv Solanki
- Biology Department, Indiana University Northwest, Gary, IN, USA
| | | | - Alexey L Arkov
- Department of Biological Sciences, Murray State University, Murray, KY, USA
| | - Ming Gao
- Biology Department, Indiana University Northwest, Gary, IN, USA
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7
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Comparative Proteomic Profiling Reveals Molecular Characteristics Associated with Oogenesis and Oocyte Maturation during Ovarian Development of Bactrocera dorsalis (Hendel). Int J Mol Sci 2017; 18:ijms18071379. [PMID: 28665301 PMCID: PMC5535872 DOI: 10.3390/ijms18071379] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Revised: 06/19/2017] [Accepted: 06/24/2017] [Indexed: 01/16/2023] Open
Abstract
Time-dependent expression of proteins in ovary is important to understand oogenesis in insects. Here, we profiled the proteomes of developing ovaries from Bactrocera dorsalis (Hendel) to obtain information about ovarian development with particular emphasis on differentially expressed proteins (DEPs) involved in oogenesis. A total of 4838 proteins were identified with an average peptide number of 8.15 and sequence coverage of 20.79%. Quantitative proteomic analysis showed that a total of 612 and 196 proteins were differentially expressed in developing and mature ovaries, respectively. Furthermore, 153, 196 and 59 potential target proteins were highly expressed in early, vitellogenic and mature ovaries and most tested DEPs had the similar trends consistent with the respective transcriptional profiles. These proteins were abundantly expressed in pre-vitellogenic and vitellogenic stages, including tropomyosin, vitellogenin, eukaryotic translation initiation factor, heat shock protein, importin protein, vitelline membrane protein, and chorion protein. Several hormone and signal pathway related proteins were also identified during ovarian development including piRNA, notch, insulin, juvenile, and ecdysone hormone signal pathways. This is the first report of a global ovary proteome of a tephritid fruit fly, and may contribute to understanding the complicate processes of ovarian development and exploring the potentially novel pest control targets.
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8
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Zheng J, Gao M, Huynh N, Tindell SJ, Vo HDL, McDonald WH, Arkov AL. In vivo mapping of a dynamic ribonucleoprotein granule interactome in early Drosophila embryos. FEBS Open Bio 2016; 6:1248-1256. [PMID: 28203524 PMCID: PMC5302063 DOI: 10.1002/2211-5463.12144] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2016] [Revised: 09/21/2016] [Accepted: 10/03/2016] [Indexed: 12/22/2022] Open
Abstract
Macromolecular complexes and organelles play crucial roles within cells, but their native architectures are often unknown. Here, we use an evolutionarily conserved germline organelle, the germ granule, as a paradigm. In Drosophila embryos, we map one of its interactomes using a novel in vivo crosslinking approach that employs two interacting granule proteins and determines their common neighbor molecules. We identified an in vivo granule assembly of Tudor, Aubergine, motor and metabolic proteins, and RNA helicases, and provide evidence for direct interactions within this assembly using purified components. Our study indicates that germ granules contain efficient biochemical reactors involved in post‐transcriptional gene regulation.
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Affiliation(s)
- Jimiao Zheng
- Department of Biological Sciences Murray State University USA
| | - Ming Gao
- Biology Department Indiana University Northwest Gary IN USA
| | - Nhan Huynh
- Department of Biological Sciences Murray State University USA; Present address: University of Alberta Edmonton AB Canada
| | | | - Hieu D L Vo
- Department of Biological Sciences Murray State University USA
| | - W Hayes McDonald
- Department of Biochemistry Mass Spectrometry Research Center Vanderbilt University School of Medicine Nashville TN USA
| | - Alexey L Arkov
- Department of Biological Sciences Murray State University USA
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9
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Gao M, Thomson TC, Creed TM, Tu S, Loganathan SN, Jackson CA, McCluskey P, Lin Y, Collier SE, Weng Z, Lasko P, Ohi MD, Arkov AL. Glycolytic enzymes localize to ribonucleoprotein granules in Drosophila germ cells, bind Tudor and protect from transposable elements. EMBO Rep 2015; 16:379-86. [PMID: 25600116 DOI: 10.15252/embr.201439694] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Germ cells give rise to all cell lineages in the next-generation and are responsible for the continuity of life. In a variety of organisms, germ cells and stem cells contain large ribonucleoprotein granules. Although these particles were discovered more than 100 years ago, their assembly and functions are not well understood. Here we report that glycolytic enzymes are components of these granules in Drosophila germ cells and both their mRNAs and the enzymes themselves are enriched in germ cells. We show that these enzymes are specifically required for germ cell development and that they protect their genomes from transposable elements, providing the first link between metabolism and transposon silencing. We further demonstrate that in the granules, glycolytic enzymes associate with the evolutionarily conserved Tudor protein. Our biochemical and single-particle EM structural analyses of purified Tudor show a flexible molecule and suggest a mechanism for the recruitment of glycolytic enzymes to the granules. Our data indicate that germ cells, similarly to stem cells and tumor cells, might prefer to produce energy through the glycolytic pathway, thus linking a particular metabolism to pluripotency.
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Affiliation(s)
- Ming Gao
- Department of Biological Sciences, Murray State University, Murray, KY, USA
| | - Travis C Thomson
- Program in Molecular Medicine, University of Massachusetts Medical School, Worcester, MA, USA
| | - T Michael Creed
- Department of Biological Sciences, Murray State University, Murray, KY, USA
| | - Shikui Tu
- Program in Bioinformatics and Integrative Biology, University of Massachusetts Medical School, Worcester, MA, USA
| | - Sudan N Loganathan
- Department of Biological Sciences, Murray State University, Murray, KY, USA
| | | | - Patrick McCluskey
- Department of Biological Sciences, Murray State University, Murray, KY, USA
| | - Yanyan Lin
- Department of Biological Sciences, Murray State University, Murray, KY, USA
| | - Scott E Collier
- Department of Cell and Developmental Biology, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Zhiping Weng
- Program in Bioinformatics and Integrative Biology, University of Massachusetts Medical School, Worcester, MA, USA
| | - Paul Lasko
- Department of Biology, McGill University, Montreal, QC, Canada
| | - Melanie D Ohi
- Department of Cell and Developmental Biology, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Alexey L Arkov
- Department of Biological Sciences, Murray State University, Murray, KY, USA
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10
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Gao M, McCluskey P, Loganathan SN, Arkov AL. An in vivo crosslinking approach to isolate protein complexes from Drosophila embryos. J Vis Exp 2014. [PMID: 24797807 DOI: 10.3791/51387] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
Many cellular processes are controlled by multisubunit protein complexes. Frequently these complexes form transiently and require native environment to assemble. Therefore, to identify these functional protein complexes, it is important to stabilize them in vivo before cell lysis and subsequent purification. Here we describe a method used to isolate large bona fide protein complexes from Drosophila embryos. This method is based on embryo permeabilization and stabilization of the complexes inside the embryos by in vivo crosslinking using a low concentration of formaldehyde, which can easily cross the cell membrane. Subsequently, the protein complex of interest is immunopurified followed by gel purification and analyzed by mass spectrometry. We illustrate this method using purification of a Tudor protein complex, which is essential for germline development. Tudor is a large protein, which contains multiple Tudor domains--small modules that interact with methylated arginines or lysines of target proteins. This method can be adapted for isolation of native protein complexes from different organisms and tissues.
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Affiliation(s)
- Ming Gao
- Department of Biological Sciences, Murray State University
| | | | | | - Alexey L Arkov
- Department of Biological Sciences, Murray State University;
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11
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Gao M, Arkov AL. Next generation organelles: structure and role of germ granules in the germline. Mol Reprod Dev 2012; 80:610-23. [PMID: 23011946 DOI: 10.1002/mrd.22115] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2012] [Accepted: 09/14/2012] [Indexed: 12/20/2022]
Abstract
Germ cells belong to a unique class of stem cells that gives rise to eggs and sperm, and ultimately to an entire organism after gamete fusion. In many organisms, germ cells contain electron-dense structures that are also known as nuage or germ granules. Although germ granules were discovered more than 100 years ago, their composition, structure, assembly, and function are not fully understood. Germ granules contain non-coding RNAs, mRNAs, and proteins required for germline development. Here we review recent studies that highlight the importance of several protein families in germ granule assembly and function, including germ granule inducers, which initiate the granule formation, and downstream components, such as RNA helicases and Tudor domain-Piwi protein-piRNA complexes. Assembly of these components into one granule is likely to result in a highly efficient molecular machine that ensures translational control and protects germline DNA from mutations caused by mobile genetic elements. Furthermore, recent studies have shown that different somatic cells, including stem cells and neurons, produce germ granule components that play a crucial role in stem cell maintenance and memory formation, indicating a much more diverse functional repertoire for these organelles than previously thought.
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Affiliation(s)
- Ming Gao
- Department of Biological Sciences, Murray State University, Murray, Kentucky 42071, USA
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12
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Juliano C, Wang J, Lin H. Uniting germline and stem cells: the function of Piwi proteins and the piRNA pathway in diverse organisms. Annu Rev Genet 2011; 45:447-69. [PMID: 21942366 DOI: 10.1146/annurev-genet-110410-132541] [Citation(s) in RCA: 265] [Impact Index Per Article: 20.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The topipotency of the germline is the full manifestation of the pluri- and multipotency of embryonic and adult stem cells, thus the germline and stem cells must share common mechanisms that guarantee their multipotentials in development. One of the few such known shared mechanisms is represented by Piwi proteins, which constitute one of the two subfamilies of the Argonaute protein family. Piwi proteins bind to Piwi-interacting RNAs (piRNAs) that are generally 26 to 31 nucleotides in length. Both Piwi proteins and piRNAs are most abundantly expressed in the germline. Moreover, Piwi proteins are expressed broadly in certain types of somatic stem/progenitor cells and other somatic cells across animal phylogeny. Recent studies indicate that the Piwi-piRNA pathway mediates epigenetic programming and posttranscriptional regulation, which may be responsible for its function in germline specification, gametogenesis, stem cell maintenance, transposon silencing, and genome integrity in diverse organisms.
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Affiliation(s)
- Celina Juliano
- Yale Stem Cell Center and Department of Cell Biology, Yale University School of Medicine, New Haven, Connecticut 06509, USA.
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