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  1. Article ; Online: Evolution remodels olfactory and mating-receptive behaviors in the transition from female to hermaphrodite reproduction.

    Ebert, Margaret S / Bargmann, Cornelia I

    Current biology : CB

    2024  Volume 34, Issue 5, Page(s) 969–979.e4

    Abstract: Male/hermaphrodite species have arisen multiple times from a male/female ancestral state in nematodes, providing a model to study behavioral adaptations to different reproductive strategies. Here, we examined the mating behaviors of male/female ( ... ...

    Abstract Male/hermaphrodite species have arisen multiple times from a male/female ancestral state in nematodes, providing a model to study behavioral adaptations to different reproductive strategies. Here, we examined the mating behaviors of male/female (gonochoristic) Caenorhabditis species in comparison with male/hermaphrodite (androdiecious) close relatives. We find that females from two species in the Elegans group chemotax to volatile odor from males, but hermaphrodites do not. Females, but not hermaphrodites, also display known mating-receptive behaviors such as sedation when male reproductive structures contact the vulva. Focusing on the male/female species C. nigoni, we show that female chemotaxis to males is limited to adult females approaching adult or near-adult males and relies upon the AWA neuron-specific transcription factor ODR-7, as does male chemotaxis to female odor as previously shown in C. elegans. However, female receptivity during mating contact is odr-7 independent. All C. nigoni female behaviors are suppressed by mating and all are absent in young hermaphrodites from the sister species C. briggsae. However, latent receptivity during mating contact can be uncovered in mutant or aged C. briggsae hermaphrodites that lack self-sperm. These results reveal two mechanistically distinct components of the shift from female to hermaphrodite behavior: the loss of female-specific odr-7-dependent chemotaxis and a sperm-dependent state of reduced receptivity to mating contact. Hermaphrodites from a second androdioecious species, C. tropicalis, recover all female behaviors upon aging, including chemotaxis to males. Regaining mating receptivity after sperm depletion could maximize hermaphrodite fitness across their lifespan.
    MeSH term(s) Animals ; Female ; Male ; Caenorhabditis elegans ; Semen ; Reproduction ; Caenorhabditis ; Spermatozoa
    Language English
    Publishing date 2024-02-09
    Publishing country England
    Document type Journal Article
    ZDB-ID 1071731-6
    ISSN 1879-0445 ; 0960-9822
    ISSN (online) 1879-0445
    ISSN 0960-9822
    DOI 10.1016/j.cub.2024.01.050
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Insulin/IGF signaling regulates presynaptic glutamate release in aversive olfactory learning.

    Cheng, Du / Lee, James S / Brown, Maximillian / Ebert, Margaret S / McGrath, Patrick T / Tomioka, Masahiro / Iino, Yuichi / Bargmann, Cornelia I

    Cell reports

    2022  Volume 41, Issue 8, Page(s) 111685

    Abstract: Insulin/insulin-like growth factor (IGF) receptor signaling (IIS) supports context-dependent learning in vertebrates and invertebrates. Here, we identify cell-specific mechanisms of IIS that integrate sensory information with food context to drive ... ...

    Abstract Insulin/insulin-like growth factor (IGF) receptor signaling (IIS) supports context-dependent learning in vertebrates and invertebrates. Here, we identify cell-specific mechanisms of IIS that integrate sensory information with food context to drive synaptic plasticity and learning. In the nematode Caenorhabditis elegans, pairing food deprivation with an odor such as butanone suppresses attraction to that odor. We find that aversive olfactory learning requires the insulin receptor substrate (IRS) protein IST-1 and atypical signaling through the insulin/IGF-1 receptor DAF-2. Cell-specific knockout and rescue demonstrate that DAF-2 acts in the AWC
    MeSH term(s) Animals ; Insulin/metabolism ; Caenorhabditis elegans Proteins/metabolism ; Glutamic Acid ; Somatomedins ; Caenorhabditis elegans/metabolism ; Sensory Receptor Cells/metabolism ; Butanones
    Chemical Substances Insulin ; Caenorhabditis elegans Proteins ; Glutamic Acid (3KX376GY7L) ; Somatomedins ; Butanones
    Language English
    Publishing date 2022-11-23
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 2649101-1
    ISSN 2211-1247 ; 2211-1247
    ISSN (online) 2211-1247
    ISSN 2211-1247
    DOI 10.1016/j.celrep.2022.111685
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Oxytocin mediated behavior in invertebrates: An evolutionary perspective.

    Lockard, Meghan A / Ebert, Margaret S / Bargmann, Cornelia I

    Developmental neurobiology

    2017  Volume 77, Issue 2, Page(s) 128–142

    Abstract: The molecular and functional conservation of oxytocin-related neuropeptides in behavior is striking. In animals separated by at least 600 million years of evolution, from roundworms to humans, oxytocin homologs play critical roles in the modulation of ... ...

    Abstract The molecular and functional conservation of oxytocin-related neuropeptides in behavior is striking. In animals separated by at least 600 million years of evolution, from roundworms to humans, oxytocin homologs play critical roles in the modulation of reproductive behavior and other biological functions. Here, we review the roles of oxytocin in invertebrate behavior from an evolutionary perspective. We begin by tracing the evolution of oxytocin through the invertebrate animal lineages, and then describe common themes in invertebrate behaviors that are mediated by oxytocin-related peptides, including reproductive behavior, learning and memory, food arousal, and predator/prey relationships. Finally, we discuss interesting future directions that have recently become experimentally tractable. Studying oxytocin in invertebrates offers precise insights into the activity of neuropeptides on well-defined neural circuits; the principles that emerge may also be represented in the more complex vertebrate brain. © 2016 Wiley Periodicals, Inc. Develop Neurobiol 77: 128-142, 2017.
    MeSH term(s) Animals ; Behavior, Animal/physiology ; Biological Evolution ; Invertebrates/metabolism ; Invertebrates/physiology ; Oxytocin/physiology
    Chemical Substances Oxytocin (50-56-6)
    Language English
    Publishing date 2017
    Publishing country United States
    Document type Journal Article ; Review ; Research Support, Non-U.S. Gov't
    ZDB-ID 2256184-5
    ISSN 1932-846X ; 1097-4695 ; 1932-8451 ; 0022-3034
    ISSN (online) 1932-846X ; 1097-4695
    ISSN 1932-8451 ; 0022-3034
    DOI 10.1002/dneu.22466
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Roles for microRNAs in conferring robustness to biological processes.

    Ebert, Margaret S / Sharp, Phillip A

    Cell

    2012  Volume 149, Issue 3, Page(s) 515–524

    Abstract: Biological systems use a variety of mechanisms to maintain their functions in the face of environmental and genetic perturbations. Increasing evidence suggests that, among their roles as posttranscriptional repressors of gene expression, microRNAs ( ... ...

    Abstract Biological systems use a variety of mechanisms to maintain their functions in the face of environmental and genetic perturbations. Increasing evidence suggests that, among their roles as posttranscriptional repressors of gene expression, microRNAs (miRNAs) help to confer robustness to biological processes by reinforcing transcriptional programs and attenuating aberrant transcripts, and they may in some network contexts help suppress random fluctuations in transcript copy number. These activities have important consequences for normal development and physiology, disease, and evolution. Here, we will discuss examples and principles of miRNAs that contribute to robustness in animal systems.
    MeSH term(s) Animals ; Biological Evolution ; Drosophila melanogaster/genetics ; Drosophila melanogaster/growth & development ; Drosophila melanogaster/metabolism ; Gene Expression Regulation ; Humans ; MicroRNAs/genetics
    Chemical Substances MicroRNAs
    Language English
    Publishing date 2012-04-26
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Review
    ZDB-ID 187009-9
    ISSN 1097-4172 ; 0092-8674
    ISSN (online) 1097-4172
    ISSN 0092-8674
    DOI 10.1016/j.cell.2012.04.005
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: An oxytocin/vasopressin-related neuropeptide modulates social foraging behavior in the clonal raider ant.

    Fetter-Pruneda, Ingrid / Hart, Taylor / Ulrich, Yuko / Gal, Asaf / Oxley, Peter R / Olivos-Cisneros, Leonora / Ebert, Margaret S / Kazmi, Manija A / Garrison, Jennifer L / Bargmann, Cornelia I / Kronauer, Daniel J C

    PLoS biology

    2021  Volume 19, Issue 6, Page(s) e3001305

    Abstract: Oxytocin/vasopressin-related neuropeptides are highly conserved and play major roles in regulating social behavior across vertebrates. However, whether their insect orthologue, inotocin, regulates the behavior of social groups remains unknown. Here, we ... ...

    Abstract Oxytocin/vasopressin-related neuropeptides are highly conserved and play major roles in regulating social behavior across vertebrates. However, whether their insect orthologue, inotocin, regulates the behavior of social groups remains unknown. Here, we show that in the clonal raider ant Ooceraea biroi, individuals that perform tasks outside the nest have higher levels of inotocin in their brains than individuals of the same age that remain inside the nest. We also show that older ants, which spend more time outside the nest, have higher inotocin levels than younger ants. Inotocin thus correlates with the propensity to perform tasks outside the nest. Additionally, increasing inotocin pharmacologically increases the tendency of ants to leave the nest. However, this effect is contingent on age and social context. Pharmacologically treated older ants have a higher propensity to leave the nest only in the presence of larvae, whereas younger ants seem to do so only in the presence of pupae. Our results suggest that inotocin signaling plays an important role in modulating behaviors that correlate with age, such as social foraging, possibly by modulating behavioral response thresholds to specific social cues. Inotocin signaling thereby likely contributes to behavioral individuality and division of labor in ant societies.
    MeSH term(s) Aging/physiology ; Animals ; Ants/physiology ; Behavior, Animal/physiology ; Brain/physiology ; HEK293 Cells ; Humans ; Oxytocin/chemistry ; Oxytocin/metabolism ; Social Behavior ; Vasopressins/chemistry ; Vasopressins/metabolism
    Chemical Substances Vasopressins (11000-17-2) ; Oxytocin (50-56-6)
    Language English
    Publishing date 2021-06-30
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 2126776-5
    ISSN 1545-7885 ; 1544-9173
    ISSN (online) 1545-7885
    ISSN 1544-9173
    DOI 10.1371/journal.pbio.3001305
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: MicroRNA sponges: progress and possibilities.

    Ebert, Margaret S / Sharp, Phillip A

    RNA (New York, N.Y.)

    2010  Volume 16, Issue 11, Page(s) 2043–2050

    Abstract: The microRNA (miRNA) "sponge" method was introduced three years ago as a means to create continuous miRNA loss of function in cell lines and transgenic organisms. Sponge RNAs contain complementary binding sites to a miRNA of interest, and are produced ... ...

    Abstract The microRNA (miRNA) "sponge" method was introduced three years ago as a means to create continuous miRNA loss of function in cell lines and transgenic organisms. Sponge RNAs contain complementary binding sites to a miRNA of interest, and are produced from transgenes within cells. As with most miRNA target genes, a sponge's binding sites are specific to the miRNA seed region, which allows them to block a whole family of related miRNAs. This transgenic approach has proven to be a useful tool to probe miRNA functions in a variety of experimental systems. Here we will discuss the ways sponge and related constructs can be optimized and review recent applications of this method with particular emphasis on stable expression in cancer studies and in transgenic animals.
    MeSH term(s) Animals ; Gene Expression Regulation ; Gene Transfer Techniques ; Humans ; MicroRNAs/genetics ; Nucleic Acid Amplification Techniques/methods
    Chemical Substances MicroRNAs
    Language English
    Publishing date 2010-09-20
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Review
    ZDB-ID 1241540-6
    ISSN 1469-9001 ; 1355-8382
    ISSN (online) 1469-9001
    ISSN 1355-8382
    DOI 10.1261/rna.2414110
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: An oxytocin/vasopressin-related neuropeptide modulates social foraging behavior in the clonal raider ant.

    Ingrid Fetter-Pruneda / Taylor Hart / Yuko Ulrich / Asaf Gal / Peter R Oxley / Leonora Olivos-Cisneros / Margaret S Ebert / Manija A Kazmi / Jennifer L Garrison / Cornelia I Bargmann / Daniel J C Kronauer

    PLoS Biology, Vol 19, Iss 6, p e

    2021  Volume 3001305

    Abstract: Oxytocin/vasopressin-related neuropeptides are highly conserved and play major roles in regulating social behavior across vertebrates. However, whether their insect orthologue, inotocin, regulates the behavior of social groups remains unknown. Here, we ... ...

    Abstract Oxytocin/vasopressin-related neuropeptides are highly conserved and play major roles in regulating social behavior across vertebrates. However, whether their insect orthologue, inotocin, regulates the behavior of social groups remains unknown. Here, we show that in the clonal raider ant Ooceraea biroi, individuals that perform tasks outside the nest have higher levels of inotocin in their brains than individuals of the same age that remain inside the nest. We also show that older ants, which spend more time outside the nest, have higher inotocin levels than younger ants. Inotocin thus correlates with the propensity to perform tasks outside the nest. Additionally, increasing inotocin pharmacologically increases the tendency of ants to leave the nest. However, this effect is contingent on age and social context. Pharmacologically treated older ants have a higher propensity to leave the nest only in the presence of larvae, whereas younger ants seem to do so only in the presence of pupae. Our results suggest that inotocin signaling plays an important role in modulating behaviors that correlate with age, such as social foraging, possibly by modulating behavioral response thresholds to specific social cues. Inotocin signaling thereby likely contributes to behavioral individuality and division of labor in ant societies.
    Keywords Biology (General) ; QH301-705.5
    Subject code 590
    Language English
    Publishing date 2021-06-01T00:00:00Z
    Publisher Public Library of Science (PLoS)
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article ; Online: Emerging roles for natural microRNA sponges.

    Ebert, Margaret S / Sharp, Phillip A

    Current biology : CB

    2010  Volume 20, Issue 19, Page(s) R858–61

    Abstract: Recently, a non-coding RNA expressed from a human pseudogene was reported to regulate the corresponding protein-coding mRNA by acting as a decoy for microRNAs (miRNAs) that bind to common sites in the 3' untranslated regions (UTRs). It was proposed that ... ...

    Abstract Recently, a non-coding RNA expressed from a human pseudogene was reported to regulate the corresponding protein-coding mRNA by acting as a decoy for microRNAs (miRNAs) that bind to common sites in the 3' untranslated regions (UTRs). It was proposed that competing for miRNAs might be a general activity of pseudogenes. This study raises questions about the potential ability of thousands of non-coding transcripts to interact with miRNAs and influence the expression of miRNA target genes. Three years ago, artificial miRNA decoys termed 'miRNA sponges' were introduced as a means to create loss-of-function phenotypes for miRNA families in cell culture and in virally infected tissue and transgenic animals. Given the efficacy of miRNA sponges expressed from stable chromosomal insertions, it seemed plausible that natural non-coding RNAs might have evolved to sequence-specifically sequester miRNAs. The first such endogenous sponge RNA was discovered in plants and found to attenuate a miRNA-mediated response to an environmental stress. More recently, a viral non-coding RNA was observed to sequester and promote the degradation of a cellular miRNA in infected primate cells. In this review we discuss the potential and proven roles for endogenous miRNA sponges and consider some criteria for screening candidate sponge RNAs.
    MeSH term(s) 3' Untranslated Regions ; Animals ; Humans ; MicroRNAs/genetics ; MicroRNAs/metabolism ; Pseudogenes ; RNA, Messenger/genetics ; RNA, Messenger/metabolism ; RNA, Untranslated/genetics ; RNA, Untranslated/metabolism ; RNA, Viral/genetics ; RNA, Viral/metabolism
    Chemical Substances 3' Untranslated Regions ; MicroRNAs ; RNA, Messenger ; RNA, Untranslated ; RNA, Viral
    Language English
    Publishing date 2010-08-25
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Review
    ZDB-ID 1071731-6
    ISSN 1879-0445 ; 0960-9822
    ISSN (online) 1879-0445
    ISSN 0960-9822
    DOI 10.1016/j.cub.2010.08.052
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Sinus Development and Pneumatization in a Primary Ciliary Dyskinesia Cohort.

    Pappa, Andrew K / Sullivan, Kelli M / Lopez, Erin M / Adams, Katherine N / Zanation, Adam M / Ebert, Charles S / Thorp, Brian D / Senior, Brent A / Leigh, Margaret W / Knowles, Mike R / Kimple, Adam J

    American journal of rhinology & allergy

    2020  Volume 35, Issue 1, Page(s) 72–76

    Abstract: Background: Primary ciliary dyskinesia (PCD) is a genetically diverse disease which causes impaired mucociliary clearance, and results in pulmonary, otologic, and rhinologic disease in affected patients. Genetic mutations in multiple genes impair the ... ...

    Abstract Background: Primary ciliary dyskinesia (PCD) is a genetically diverse disease which causes impaired mucociliary clearance, and results in pulmonary, otologic, and rhinologic disease in affected patients. Genetic mutations in multiple genes impair the ability of patients to clear mucous from the lungs, middle ear, and sinonasal cavity and lead to chronic pulmonary and sinonasal symptoms.
    Methods: We identified 17 PCD patients who had available CT scans. Volumes for bilateral maxillary, sphenoid, and frontal sinuses were calculated. A control population of patients who had preoperative CT scans for endoscopic endonasal resection of skull base pathology without sinonasal cavity involvement was also identified.
    Results: The mean age of PCD was 33 and ranged from 13 to 54 years. Patients were age- and gender-matched to a control group that underwent resection of anterior skull-base tumors and had a mean age of 35 that ranged between 17-53 years old. The volumes for all thee sinus cavities were significantly smaller (p < 0.007) compared to the control population. The average Lund-Mackay score was 10.6 in the PCD cohort (range 6-16) in comparison to an average of 0.7 in the control cohort (range 0-2).
    Conclusions: Overall sinus volumes were smaller in patients with PCD compared to our control population. Future studies will be aimed at understanding defects in sinus development as a function of specific genetic mutations in PCD patients. Ultimately, a better understanding of the underlying pathophysiology of PCD will allow us to identify the optimal treatment practices for this unique patient group.
    MeSH term(s) Adolescent ; Adult ; Ciliary Motility Disorders ; Cohort Studies ; Endoscopy ; Humans ; Middle Aged ; Paranasal Sinuses/diagnostic imaging ; Paranasal Sinuses/surgery ; Tomography, X-Ray Computed ; Young Adult
    Language English
    Publishing date 2020-06-19
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2482804-X
    ISSN 1945-8932 ; 1945-8924
    ISSN (online) 1945-8932
    ISSN 1945-8924
    DOI 10.1177/1945892420933175
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Genome-wide dissection of microRNA functions and cotargeting networks using gene set signatures.

    Tsang, John S / Ebert, Margaret S / van Oudenaarden, Alexander

    Molecular cell

    2010  Volume 38, Issue 1, Page(s) 140–153

    Abstract: MicroRNAs are emerging as important regulators of diverse biological processes and pathologies in animals and plants. Though hundreds of human microRNAs are known, only a few have known functions. Here, we predict human microRNA functions by using a new ... ...

    Abstract MicroRNAs are emerging as important regulators of diverse biological processes and pathologies in animals and plants. Though hundreds of human microRNAs are known, only a few have known functions. Here, we predict human microRNA functions by using a new method that systematically assesses the statistical enrichment of several microRNA-targeting signatures in annotated gene sets such as signaling networks and protein complexes. Some of our top predictions are supported by published experiments, yet many are entirely new or provide mechanistic insights to known phenotypes. Our results indicate that coordinated microRNA targeting of closely connected genes is prevalent across pathways. We use the same method to infer which microRNAs regulate similar targets and provide the first genome-wide evidence of pervasive cotargeting, in which a handful of "hub" microRNAs are involved in a majority of cotargeting relationships. Our method and analyses pave the way to systematic discovery of microRNA functions.
    MeSH term(s) 3' Untranslated Regions/genetics ; Animals ; Cardiomegaly/genetics ; Cardiomegaly/physiopathology ; Gene Expression Profiling ; Gene Regulatory Networks ; Humans ; MicroRNAs/genetics ; MicroRNAs/metabolism ; Multiprotein Complexes ; Signal Transduction/genetics
    Chemical Substances 3' Untranslated Regions ; MicroRNAs ; Multiprotein Complexes
    Language English
    Publishing date 2010-04-13
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 1415236-8
    ISSN 1097-4164 ; 1097-2765
    ISSN (online) 1097-4164
    ISSN 1097-2765
    DOI 10.1016/j.molcel.2010.03.007
    Database MEDical Literature Analysis and Retrieval System OnLINE

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