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  1. Article: The Clock Takes Shape-24 h Dynamics in Genome Topology.

    Tartour, Kévin / Padmanabhan, Kiran

    Frontiers in cell and developmental biology

    2022  Volume 9, Page(s) 799971

    Abstract: Circadian rhythms orchestrate organismal physiology and behavior in order to anticipate daily changes in the environment. Virtually all cells have an internal rhythm that is synchronized every day by Zeitgebers (environmental cues). The synchrony between ...

    Abstract Circadian rhythms orchestrate organismal physiology and behavior in order to anticipate daily changes in the environment. Virtually all cells have an internal rhythm that is synchronized every day by Zeitgebers (environmental cues). The synchrony between clocks within the animal enables the fitness and the health of organisms. Conversely, disruption of rhythms is linked to a variety of disorders: aging, cancer, metabolic diseases, and psychological disorders among others. At the cellular level, mammalian circadian rhythms are built on several layers of complexity. The transcriptional-translational feedback loop (TTFL) was the first to be described in the 90s. Thereafter oscillations in epigenetic marks highlighted the role of chromatin state in organizing the TTFL. More recently, studies on the 3D organization of the genome suggest that genome topology could be yet another layer of control on cellular circadian rhythms. The dynamic nature of genome topology over a solar day implies that the 3D mammalian genome has to be considered in the fourth dimension-in time. Whether oscillations in genome topology are a consequence of 24 h gene-expression or a driver of transcriptional cycles remains an open question. All said and done, circadian clock-gated phenomena such as gene expression, DNA damage response, cell metabolism and animal behavior-go hand in hand with 24 h rhythms in genome topology.
    Language English
    Publishing date 2022-01-03
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2737824-X
    ISSN 2296-634X
    ISSN 2296-634X
    DOI 10.3389/fcell.2021.799971
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: The Clock Takes Shape—24 h Dynamics in Genome Topology

    Kévin Tartour / Kiran Padmanabhan

    Frontiers in Cell and Developmental Biology, Vol

    2022  Volume 9

    Abstract: Circadian rhythms orchestrate organismal physiology and behavior in order to anticipate daily changes in the environment. Virtually all cells have an internal rhythm that is synchronized every day by Zeitgebers (environmental cues). The synchrony between ...

    Abstract Circadian rhythms orchestrate organismal physiology and behavior in order to anticipate daily changes in the environment. Virtually all cells have an internal rhythm that is synchronized every day by Zeitgebers (environmental cues). The synchrony between clocks within the animal enables the fitness and the health of organisms. Conversely, disruption of rhythms is linked to a variety of disorders: aging, cancer, metabolic diseases, and psychological disorders among others. At the cellular level, mammalian circadian rhythms are built on several layers of complexity. The transcriptional-translational feedback loop (TTFL) was the first to be described in the 90s. Thereafter oscillations in epigenetic marks highlighted the role of chromatin state in organizing the TTFL. More recently, studies on the 3D organization of the genome suggest that genome topology could be yet another layer of control on cellular circadian rhythms. The dynamic nature of genome topology over a solar day implies that the 3D mammalian genome has to be considered in the fourth dimension-in time. Whether oscillations in genome topology are a consequence of 24 h gene-expression or a driver of transcriptional cycles remains an open question. All said and done, circadian clock-gated phenomena such as gene expression, DNA damage response, cell metabolism and animal behavior—go hand in hand with 24 h rhythms in genome topology.
    Keywords circadian rhythm ; clock ; genome topology ; 3D genome ; chromatin ; DNA damage ; Biology (General) ; QH301-705.5
    Subject code 612
    Language English
    Publishing date 2022-01-01T00:00:00Z
    Publisher Frontiers Media S.A.
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Touch receptor end-organ innervation and function require sensory neuron expression of the transcription factor Meis2.

    Desiderio, Simon / Schwaller, Frederick / Tartour, Kevin / Padmanabhan, Kiran / Lewin, Gary R / Carroll, Patrick / Marmigere, Frederic

    eLife

    2024  Volume 12

    Abstract: Touch sensation is primarily encoded by mechanoreceptors, called low-threshold mechanoreceptors (LTMRs), with their cell bodies in the dorsal root ganglia. Because of their great diversity in terms of molecular signature, terminal endings morphology, and ...

    Abstract Touch sensation is primarily encoded by mechanoreceptors, called low-threshold mechanoreceptors (LTMRs), with their cell bodies in the dorsal root ganglia. Because of their great diversity in terms of molecular signature, terminal endings morphology, and electrophysiological properties, mirroring the complexity of tactile experience, LTMRs are a model of choice to study the molecular cues differentially controlling neuronal diversification. While the transcriptional codes that define different LTMR subtypes have been extensively studied, the molecular players that participate in their late maturation and in particular in the striking diversity of their end-organ morphological specialization are largely unknown. Here we identified the TALE homeodomain transcription factor Meis2 as a key regulator of LTMRs target-field innervation in mice.
    MeSH term(s) Animals ; Mice ; Gene Expression Regulation ; Mechanoreceptors ; Nervous System Physiological Phenomena ; Sensory Receptor Cells ; Transcription Factors/genetics ; Homeodomain Proteins/genetics
    Chemical Substances Transcription Factors ; Mrg1 protein, mouse ; Homeodomain Proteins
    Language English
    Publishing date 2024-02-22
    Publishing country England
    Document type Journal Article
    ZDB-ID 2687154-3
    ISSN 2050-084X ; 2050-084X
    ISSN (online) 2050-084X
    ISSN 2050-084X
    DOI 10.7554/eLife.89287
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Detecting abnormal cell behaviors from dry mass time series.

    Bailly, Romain / Malfante, Marielle / Allier, Cédric / Paviolo, Chiara / Ghenim, Lamya / Padmanabhan, Kiran / Bardin, Sabine / Mars, Jérôme

    Scientific reports

    2024  Volume 14, Issue 1, Page(s) 7053

    Abstract: The prediction of pathological changes on single cell behaviour is a challenging task for deep learning models. Indeed, in self-supervised learning methods, no prior labels are used for the training and all of the information for event predictions are ... ...

    Abstract The prediction of pathological changes on single cell behaviour is a challenging task for deep learning models. Indeed, in self-supervised learning methods, no prior labels are used for the training and all of the information for event predictions are extracted from the data themselves. We present here a novel self-supervised learning model for the detection of anomalies in a given cell population, StArDusTS. Cells are monitored over time, and analysed to extract time-series of dry mass values. We assessed its performances on different cell lines, showing a precision of 96% in the automatic detection of anomalies. Additionally, anomaly detection was also associated with cell measurement errors inherent to the acquisition or analysis pipelines, leading to an improvement of the upstream methods for feature extraction. Our results pave the way to novel architectures for the continuous monitoring of cell cultures in applied research or bioproduction applications, and for the prediction of pathological cellular changes.
    MeSH term(s) Humans ; Time Factors ; Problem Behavior ; Cell Culture Techniques ; Cell Line ; Self-Management
    Language English
    Publishing date 2024-03-25
    Publishing country England
    Document type Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-024-57684-w
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Desynchronization of Circadian Clocks in Cancer: A Metabolic and Epigenetic Connection.

    Padmanabhan, Kiran / Billaud, Marc

    Frontiers in endocrinology

    2017  Volume 8, Page(s) 136

    Abstract: Circadian clocks are innate oscillators that drive daily rhythms in metabolism, physiology, and behavior. 24-h rhythms in gene expression, driven by core clock transcription factors, reflect the epigenetic state of the cell, which in turn is dictated by ... ...

    Abstract Circadian clocks are innate oscillators that drive daily rhythms in metabolism, physiology, and behavior. 24-h rhythms in gene expression, driven by core clock transcription factors, reflect the epigenetic state of the cell, which in turn is dictated by the metabolic environment. Cancer cells alter their metabolic state and gene expression and therefore are likely to tweak circadian clock function in their favor. Over the past decade, we have witnessed an extraordinary increase in systems-level studies that suggest intricate mechanistic links between the cellular metabolome and the circadian epigenome. In parallel, reprogramming of cellular clock function in cancers is increasingly evident and the role of clock genes in the development of hematological tumors, as well as their pathophysiological effects on tissues distal to the tumor, has been described. Furthermore, the interplay between components of the circadian clock, metabolic enzymes, and oncogenes is starting to be better understood, such as the close association between overexpression of the Myc oncogene and perturbation of circadian and metabolic rhythms, thus opening new avenues to treat cancers. This review article explores current knowledge on the circadian metabolome and the molecular pathways they control, with a focus on their involvement in the development of hematopoietic malignancies.
    Language English
    Publishing date 2017
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2592084-4
    ISSN 1664-2392
    ISSN 1664-2392
    DOI 10.3389/fendo.2017.00136
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Oppositional poly(A) tail length regulation by FMRP and CPEB1.

    Shin, Jihae / Paek, Ki Young / Chikhaoui, Lies / Jung, Suna / Ponny, SitharaRaju / Suzuki, Yutaka / Padmanabhan, Kiran / Richter, Joel D

    RNA (New York, N.Y.)

    2022  Volume 28, Issue 5, Page(s) 756–765

    Abstract: Poly(A) tail length is regulated in both the nucleus and cytoplasm. One factor that controls polyadenylation in the cytoplasm is CPEB1, an RNA binding protein that associates with specific mRNA 3'UTR sequences to tether enzymes that add and remove poly(A) ...

    Abstract Poly(A) tail length is regulated in both the nucleus and cytoplasm. One factor that controls polyadenylation in the cytoplasm is CPEB1, an RNA binding protein that associates with specific mRNA 3'UTR sequences to tether enzymes that add and remove poly(A). Two of these enzymes, the noncanonical poly(A) polymerases GLD2 (TENT2, PAPD4, Wispy) and GLD4 (TENT4B, PAPD5, TRF4, TUT3), interact with CPEB1 to extend poly(A). To identify additional RNA binding proteins that might anchor GLD4 to RNA, we expressed double tagged GLD4 in U87MG cells, which was used for sequential immunoprecipitation and elution followed by mass spectrometry. We identified several RNA binding proteins that coprecipitated with GLD4, among which was FMRP. To assess whether FMRP regulates polyadenylation, we performed TAIL-seq from WT and FMRP-deficient HEK293 cells. Surprisingly, loss of FMRP resulted in an overall increase in poly(A), which was also observed for several specific mRNAs. Conversely, loss of CPEB1 elicited an expected decrease in poly(A), which was examined in cultured neurons. We also examined polyadenylation in wild type (WT) and FMRP-deficient mouse brain cortex by direct RNA nanopore sequencing, which identified RNAs with both increased and decreased poly(A). Our data show that FMRP has a role in mediating poly(A) tail length, which adds to its repertoire of RNA regulation.
    MeSH term(s) Animals ; HEK293 Cells ; Humans ; Mice ; Poly A/genetics ; Poly A/metabolism ; Polyadenylation ; Polynucleotide Adenylyltransferase/metabolism ; RNA, Messenger/genetics ; RNA, Messenger/metabolism ; RNA-Binding Proteins/genetics ; RNA-Binding Proteins/metabolism ; Transcription Factors/genetics ; mRNA Cleavage and Polyadenylation Factors/genetics ; mRNA Cleavage and Polyadenylation Factors/metabolism
    Chemical Substances CPEB1 protein, human ; RNA, Messenger ; RNA-Binding Proteins ; Transcription Factors ; mRNA Cleavage and Polyadenylation Factors ; Poly A (24937-83-5) ; Polynucleotide Adenylyltransferase (EC 2.7.7.19)
    Language English
    Publishing date 2022-02-25
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 1241540-6
    ISSN 1469-9001 ; 1355-8382
    ISSN (online) 1469-9001
    ISSN 1355-8382
    DOI 10.1261/rna.079050.121
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Mammalian PERIOD2 regulates H2A.Z incorporation in chromatin to orchestrate circadian negative feedback.

    Tartour, Kevin / Andriani, Francesca / Folco, Eric G / Letkova, Dominika / Schneider, Raphael / Saidi, Isahak / Sato, Tomoki / Welz, Patrick-Simon / Benitah, Salvador Aznar / Allier, Cédric / Padmanabhan, Kiran

    Nature structural & molecular biology

    2022  Volume 29, Issue 6, Page(s) 549–562

    Abstract: Mammalian circadian oscillators are built on a feedback loop in which the activity of the transcription factor CLOCK-BMAL1 is repressed by the PER-CRY complex. Here, we show that murine ... ...

    Abstract Mammalian circadian oscillators are built on a feedback loop in which the activity of the transcription factor CLOCK-BMAL1 is repressed by the PER-CRY complex. Here, we show that murine Per
    MeSH term(s) ARNTL Transcription Factors/genetics ; ARNTL Transcription Factors/metabolism ; Animals ; Chromatin ; Circadian Rhythm/physiology ; Feedback ; Histones/metabolism ; Mammals/genetics ; Mice ; Nucleosomes ; Period Circadian Proteins/metabolism
    Chemical Substances ARNTL Transcription Factors ; Chromatin ; Histones ; Nucleosomes ; Per2 protein, mouse ; Period Circadian Proteins
    Language English
    Publishing date 2022-05-23
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2126708-X
    ISSN 1545-9985 ; 1545-9993
    ISSN (online) 1545-9985
    ISSN 1545-9993
    DOI 10.1038/s41594-022-00777-9
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Comparative Evaluation of Remineralizing Effect of Novamin and Tricalcium Phosphate on Artificial Caries: An in vitro Study.

    Jagga, Umang / Paul, Uttam / Padmanabhan, Vivek / Kashyap, Arpita / Guram, Guneet / Keswani, Kiran

    The journal of contemporary dental practice

    2018  Volume 19, Issue 1, Page(s) 109–112

    Abstract: Aim: The aim of the present study was to compare the remineralizing efficacy of novamin and tricalcium phosphate (TCP).: Materials and methods: Nail varnish was coated to a total of 30 sound human premolars except for 5 mm × 5 mm window. Baseline ... ...

    Abstract Aim: The aim of the present study was to compare the remineralizing efficacy of novamin and tricalcium phosphate (TCP).
    Materials and methods: Nail varnish was coated to a total of 30 sound human premolars except for 5 mm × 5 mm window. Baseline microhardness was measured for all test samples. Artificial carious lesions were created for all teeth by subjecting them to demineralization process. Then microhardness of demineralized lesion was measured. Later artificial caries teeth were equally divided into two groups to treat with remineralization solution for 10 days; group I: novamin and group II: TCP. After 10 days of pH cycling, microhardness was measured. The data were statistically analyzed using Statistical Package for the Social Sciences (SPSS) statistical software from Chicago SPSS Inc., version 21 and using analysis of variance (ANOVA) post hoc multiple comparisons test for intergroup and significant difference at p < 0.05.
    Results: In the present study, group I indicated a higher value for remineralization compared with group II (p < 0.05).
    Conclusion: The present study showed that both novamin and TCP were effective in remineralizing the carious lesions.
    Clinical significance: This study evaluates the remineralizing potential of novamin and TCP on initial carious lesions.
    MeSH term(s) Bicuspid ; Calcium Phosphates/pharmacology ; Cariostatic Agents/pharmacology ; Dental Caries/drug therapy ; Dental Enamel/drug effects ; Glass ; Hardness Tests ; Humans ; Hydrogen-Ion Concentration ; In Vitro Techniques ; Tooth Demineralization/drug therapy
    Chemical Substances Calcium Phosphates ; Cariostatic Agents ; NovaMin ; tricalcium phosphate (K4C08XP666)
    Language English
    Publishing date 2018-01-01
    Publishing country India
    Document type Journal Article
    ISSN 1526-3711
    ISSN (online) 1526-3711
    DOI 10.5005/jp-journals-10024-2221
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: A Dominant C150Y Mutation in FHL1 Induces Structural Alterations in LIM2 Domain Causing Protein Aggregation In Human and Drosophila Indirect Flight Muscles.

    Santhoshkumar, Rashmi / Preethish-Kumar, Veeramani / Mangalaparthi, Kiran K / Unni, Sruthi / Padmanabhan, Balasundaram / T S, Keshava Prasad / Nongthomba, Upendra / Atchayaram, Nalini / Narayanappa, Gayathri

    Journal of molecular neuroscience : MN

    2021  Volume 71, Issue 11, Page(s) 2324–2335

    Abstract: FHL1-related myopathies are rare X-linked dominant myopathies. Though clinically classified into several subgroups, spinal and scapuloperoneal muscle involvement are common to all. In this study, we identified c.449G > A, p.C150Y mutation by clinical ... ...

    Abstract FHL1-related myopathies are rare X-linked dominant myopathies. Though clinically classified into several subgroups, spinal and scapuloperoneal muscle involvement are common to all. In this study, we identified c.449G > A, p.C150Y mutation by clinical exome sequencing in two patients from same family (son and mother) of Indian origin who presented with multiple contractures. Muscle biopsy showed numerous intracytoplasmic aggregates intensely stained on HE and MGT. The strong reactions to M-NBT revealed aggregates to be reducing bodies and positively labeled to anti-FHL1 antibody. Ultrastructurally, Z-band streaming and granular and granulofilamentous material were seen. Further, the translational evidence of mutant peptide was confirmed using mass spectrometric analysis. To establish p.C150Y as the cause for protein aggregation, in vivo studies were carried out using transgenic Drosophila model which highlighted Z-band abnormalities and protein aggregates in indirect flight muscles with compromised physiological function. Thus, recapitulating the X-linked human disease phenotype. Additionally, the molecular dynamics simulation analysis unraveled the drastic change in α-helix of LIM2, the region immediately next to site of C150Y mutation that could be the plausible cause for protein aggregation. To the best of our knowledge, this is the first study of p.C150Y mutation in FHL1 identified in Indian patients with in vivo and in silico analysis to establish the cause for protein aggregation in muscle.
    MeSH term(s) Adult ; Animals ; Child ; Drosophila melanogaster ; Female ; Genes, Dominant ; Genetic Diseases, X-Linked/genetics ; Genetic Diseases, X-Linked/metabolism ; Genetic Diseases, X-Linked/pathology ; Humans ; Intracellular Signaling Peptides and Proteins/chemistry ; Intracellular Signaling Peptides and Proteins/genetics ; Intracellular Signaling Peptides and Proteins/metabolism ; LIM Domain Proteins/chemistry ; LIM Domain Proteins/genetics ; LIM Domain Proteins/metabolism ; Male ; Muscle Proteins/chemistry ; Muscle Proteins/genetics ; Muscle Proteins/metabolism ; Muscle, Skeletal/metabolism ; Muscle, Skeletal/pathology ; Muscular Diseases/congenital ; Muscular Diseases/genetics ; Muscular Diseases/metabolism ; Muscular Diseases/pathology ; Mutation, Missense ; Protein Conformation, alpha-Helical ; Protein Domains ; Protein Multimerization
    Chemical Substances FHL1 protein, human ; Intracellular Signaling Peptides and Proteins ; LIM Domain Proteins ; Muscle Proteins
    Language English
    Publishing date 2021-01-30
    Publishing country United States
    Document type Case Reports ; Journal Article
    ZDB-ID 1043392-2
    ISSN 1559-1166 ; 0895-8696
    ISSN (online) 1559-1166
    ISSN 0895-8696
    DOI 10.1007/s12031-020-01777-4
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  10. Article ; Online: H2A.Z is dispensable for both basal and activated transcription in post-mitotic mouse muscles.

    Belotti, Edwige / Lacoste, Nicolas / Simonet, Thomas / Papin, Christophe / Padmanabhan, Kiran / Scionti, Isabella / Gangloff, Yann-Gaël / Ramos, Lorrie / Dalkara, Defne / Hamiche, Ali / Dimitrov, Stefan / Schaeffer, Laurent

    Nucleic acids research

    2020  Volume 48, Issue 9, Page(s) 4601–4613

    Abstract: While the histone variant H2A.Z is known to be required for mitosis, it is also enriched in nucleosomes surrounding the transcription start site of active promoters, implicating H2A.Z in transcription. However, evidence obtained so far mainly rely on ... ...

    Abstract While the histone variant H2A.Z is known to be required for mitosis, it is also enriched in nucleosomes surrounding the transcription start site of active promoters, implicating H2A.Z in transcription. However, evidence obtained so far mainly rely on correlational data generated in actively dividing cells. We have exploited a paradigm in which transcription is uncoupled from the cell cycle by developing an in vivo system to inactivate H2A.Z in terminally differentiated post-mitotic muscle cells. ChIP-seq, RNA-seq and ATAC-seq experiments performed on H2A.Z KO post-mitotic muscle cells show that this histone variant is neither required to maintain nor to activate transcription. Altogether, this study provides in vivo evidence that in the absence of mitosis H2A.Z is dispensable for transcription and that the enrichment of H2A.Z on active promoters is a marker but not an active driver of transcription.
    MeSH term(s) Animals ; Cell Differentiation ; Cells, Cultured ; Chromatin ; Chromatin Immunoprecipitation Sequencing ; Histones/genetics ; Histones/metabolism ; Histones/physiology ; Mice ; Muscle Fibers, Skeletal ; Muscle, Skeletal/cytology ; Muscle, Skeletal/metabolism ; RNA-Seq ; Repetitive Sequences, Nucleic Acid ; Transcription Initiation Site ; Transcription, Genetic ; Transcriptional Activation
    Chemical Substances Chromatin ; H2az1 protein, mouse ; Histones
    Language English
    Publishing date 2020-03-31
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 186809-3
    ISSN 1362-4962 ; 1362-4954 ; 0301-5610 ; 0305-1048
    ISSN (online) 1362-4962 ; 1362-4954
    ISSN 0301-5610 ; 0305-1048
    DOI 10.1093/nar/gkaa157
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