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  1. Article ; Online: Plastid retrograde signaling: A developmental perspective.

    Loudya, Naresh / Barkan, Alice / López-Juez, Enrique

    The Plant cell

    2024  

    Abstract: Chloroplast activities influence nuclear gene expression, a phenomenon referred to as retrograde signaling. Biogenic retrograde signals have been revealed by changes in nuclear gene expression when chloroplast development is disrupted. Research on ... ...

    Abstract Chloroplast activities influence nuclear gene expression, a phenomenon referred to as retrograde signaling. Biogenic retrograde signals have been revealed by changes in nuclear gene expression when chloroplast development is disrupted. Research on biogenic signaling has focused on repression of Photosynthesis Associated Nuclear Genes (PhANGs) but this is just one component of a syndrome involving altered expression of thousands of genes involved in diverse processes, many of which are up-regulated. We discuss evidence for a framework that accounts for most of this syndrome. Disruption of chloroplast biogenesis prevents production of signals required to progress through discrete steps in the program of photosynthetic differentiation, causing retention of juvenile states. As a result, expression of PhANGs and other genes that act late during photosynthetic differentiation is not initiated, while expression of genes that act early is retained. The extent of juvenility, and thus the transcriptome, reflects the disrupted process: lack of plastid translation blocks development very early whereas disruption of photosynthesis without compromising plastid translation blocks development at a later stage. We discuss implications of these and other recent observations for the nature of the plastid-derived signals that regulate photosynthetic differentiation, and the role of GUN1, an enigmatic protein involved in biogenic signaling.
    Language English
    Publishing date 2024-03-28
    Publishing country England
    Document type Journal Article
    ZDB-ID 623171-8
    ISSN 1532-298X ; 1040-4651
    ISSN (online) 1532-298X
    ISSN 1040-4651
    DOI 10.1093/plcell/koae094
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  2. Article ; Online: Chloroplast biology: Cost-benefit analysis.

    López-Juez, Enrique

    Nature plants

    2015  Volume 1, Page(s) 15191

    Language English
    Publishing date 2015-12-01
    Publishing country England
    Document type Journal Article
    ISSN 2055-0278
    ISSN (online) 2055-0278
    DOI 10.1038/nplants.2015.191
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  3. Article ; Online: Mutations in the chloroplast inner envelope protein TIC100 impair and repair chloroplast protein import and impact retrograde signaling.

    Loudya, Naresh / Maffei, Douglas P F / Bédard, Jocelyn / Ali, Sabri Mohd / Devlin, Paul F / Jarvis, R Paul / López-Juez, Enrique

    The Plant cell

    2022  Volume 34, Issue 8, Page(s) 3028–3046

    Abstract: Chloroplast biogenesis requires synthesis of proteins in the nucleocytoplasm and the chloroplast itself. Nucleus-encoded chloroplast proteins are imported via multiprotein translocons in the organelle's envelope membranes. Controversy exists around ... ...

    Abstract Chloroplast biogenesis requires synthesis of proteins in the nucleocytoplasm and the chloroplast itself. Nucleus-encoded chloroplast proteins are imported via multiprotein translocons in the organelle's envelope membranes. Controversy exists around whether a 1-MDa complex comprising TIC20, TIC100, and other proteins constitutes the inner membrane TIC translocon. The Arabidopsis thaliana cue8 virescent mutant is broadly defective in plastid development. We identify CUE8 as TIC100. The tic100cue8 mutant accumulates reduced levels of 1-MDa complex components and exhibits reduced import of two nucleus-encoded chloroplast proteins of different import profiles. A search for suppressors of tic100cue8 identified a second mutation within the same gene, tic100soh1, which rescues the visible, 1 MDa complex-subunit abundance, and chloroplast protein import phenotypes. tic100soh1 retains but rapidly exits virescence and rescues the synthetic lethality of tic100cue8 when retrograde signaling is impaired by a mutation in the GENOMES UNCOUPLED 1 gene. Alongside the strong virescence, changes in RNA editing and the presence of unimported precursor proteins show that a strong signaling response is triggered when TIC100 function is altered. Our results are consistent with a role for TIC100, and by extension the 1-MDa complex, in the chloroplast import of photosynthetic and nonphotosynthetic proteins, a process which initiates retrograde signaling.
    MeSH term(s) Arabidopsis/genetics ; Arabidopsis/metabolism ; Arabidopsis Proteins/genetics ; Arabidopsis Proteins/metabolism ; Chloroplast Proteins/genetics ; Chloroplast Proteins/metabolism ; Chloroplasts/metabolism ; Mutation/genetics ; Protein Transport/physiology
    Chemical Substances Arabidopsis Proteins ; Chloroplast Proteins
    Language English
    Publishing date 2022-06-02
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 623171-8
    ISSN 1532-298X ; 1040-4651
    ISSN (online) 1532-298X
    ISSN 1040-4651
    DOI 10.1093/plcell/koac153
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  4. Article ; Online: Retrograde signalling in a virescent mutant triggers an anterograde delay of chloroplast biogenesis that requires GUN1 and is essential for survival.

    Loudya, Naresh / Okunola, Tolulope / He, Jia / Jarvis, Paul / López-Juez, Enrique

    Philosophical transactions of the Royal Society of London. Series B, Biological sciences

    2020  Volume 375, Issue 1801, Page(s) 20190400

    Abstract: Defects in chloroplast development are 'retrograde-signalled' to the nucleus, reducing synthesis of photosynthetic or related proteins. ... ...

    Abstract Defects in chloroplast development are 'retrograde-signalled' to the nucleus, reducing synthesis of photosynthetic or related proteins. The
    MeSH term(s) Arabidopsis/physiology ; Arabidopsis Proteins/genetics ; Arabidopsis Proteins/metabolism ; Chloroplasts/physiology ; DNA-Binding Proteins/genetics ; DNA-Binding Proteins/metabolism ; Mutation ; Organelle Biogenesis ; Signal Transduction
    Chemical Substances Arabidopsis Proteins ; DNA-Binding Proteins ; GUN1 protein, Arabidopsis
    Language English
    Publishing date 2020-05-04
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 208382-6
    ISSN 1471-2970 ; 0080-4622 ; 0264-3839 ; 0962-8436
    ISSN (online) 1471-2970
    ISSN 0080-4622 ; 0264-3839 ; 0962-8436
    DOI 10.1098/rstb.2019.0400
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    Einzelsignatur: Show issues

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  5. Article ; Online: A domestication-associated gene, CsLH, encodes a phytochrome B protein that regulates hypocotyl elongation in cucumber.

    Liu, Bin / Weng, Jinyang / Guan, Dailu / Zhang, Yan / Niu, Qingliang / López-Juez, Enrique / Lai, Yunsong / Garcia-Mas, Jordi / Huang, Danfeng

    Molecular horticulture

    2021  Volume 1, Issue 1, Page(s) 3

    Language English
    Publishing date 2021-06-16
    Publishing country England
    Document type Letter
    ISSN 2730-9401
    ISSN (online) 2730-9401
    DOI 10.1186/s43897-021-00005-w
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  6. Article ; Online: Cellular and transcriptomic analyses reveal two-staged chloroplast biogenesis underpinning photosynthesis build-up in the wheat leaf.

    Loudya, Naresh / Mishra, Priyanka / Takahagi, Kotaro / Uehara-Yamaguchi, Yukiko / Inoue, Komaki / Bogre, Laszlo / Mochida, Keiichi / López-Juez, Enrique

    Genome biology

    2021  Volume 22, Issue 1, Page(s) 151

    Abstract: Background: The developmental gradient in monocot leaves has been exploited to uncover leaf developmental gene expression programs and chloroplast biogenesis processes. However, the relationship between the two is barely understood, which limits the ... ...

    Abstract Background: The developmental gradient in monocot leaves has been exploited to uncover leaf developmental gene expression programs and chloroplast biogenesis processes. However, the relationship between the two is barely understood, which limits the value of transcriptome data to understand the process of chloroplast development.
    Results: Taking advantage of the developmental gradient in the bread wheat leaf, we provide a simultaneous quantitative analysis for the development of mesophyll cells and of chloroplasts as a cellular compartment. This allows us to generate the first biologically-informed gene expression map of this leaf, with the entire developmental gradient from meristematic to fully differentiated cells captured. We show that the first phase of plastid development begins with organelle proliferation, which extends well beyond cell proliferation, and continues with the establishment and then the build-up of the plastid genetic machinery. The second phase is marked by the development of photosynthetic chloroplasts which occupy the available cellular space. Using a network reconstruction algorithm, we predict that known chloroplast gene expression regulators are differentially involved across those developmental stages.
    Conclusions: Our analysis generates both the first wheat leaf transcriptional map and one of the most comprehensive descriptions to date of the developmental history of chloroplasts in higher plants. It reveals functionally distinct plastid and chloroplast development stages, identifies processes occurring in each of them, and highlights our very limited knowledge of the earliest drivers of plastid biogenesis, while providing a basis for their future identification.
    MeSH term(s) Cell Proliferation/genetics ; Chloroplasts/genetics ; Gene Expression Profiling ; Gene Expression Regulation, Plant ; Gene Regulatory Networks ; Genome, Plastid ; Photosynthesis/genetics ; Plant Leaves/cytology ; Plant Leaves/genetics ; Plant Leaves/growth & development ; Plant Proteins/metabolism ; Principal Component Analysis ; Protein Biosynthesis/genetics ; Triticum/cytology ; Triticum/genetics
    Chemical Substances Plant Proteins
    Language English
    Publishing date 2021-05-11
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2040529-7
    ISSN 1474-760X ; 1474-760X
    ISSN (online) 1474-760X
    ISSN 1474-760X
    DOI 10.1186/s13059-021-02366-3
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  7. Article ; Online: Chloroplast development in green plant tissues: the interplay between light, hormone, and transcriptional regulation.

    Cackett, Lee / Luginbuehl, Leonie H / Schreier, Tina B / Lopez-Juez, Enrique / Hibberd, Julian M

    The New phytologist

    2021  Volume 233, Issue 5, Page(s) 2000–2016

    Abstract: Chloroplasts are best known for their role in photosynthesis, but they also allow nitrogen and sulphur assimilation, amino acid, fatty acid, nucleotide and hormone synthesis. How chloroplasts develop is therefore relevant to these diverse and fundamental ...

    Abstract Chloroplasts are best known for their role in photosynthesis, but they also allow nitrogen and sulphur assimilation, amino acid, fatty acid, nucleotide and hormone synthesis. How chloroplasts develop is therefore relevant to these diverse and fundamental biological processes, but also to attempts at their rational redesign. Light is strictly required for chloroplast formation in all angiosperms and directly regulates the expression of hundreds of chloroplast-related genes. Light also modulates the levels of several hormones including brassinosteriods, cytokinins, auxins and gibberellins, which themselves control chloroplast development particularly during early stages of plant development. Transcription factors such as GOLDENLIKE1&2 (GLK1&2), GATA NITRATE-INDUCIBLE CARBON METABOLISM-INVOLVED (GNC) and CYTOKININ-RESPONSIVE GATA FACTOR 1 (CGA1) act downstream of both light and phytohormone signalling to regulate chloroplast development. Thus, in green tissues transcription factors, light signalling and hormone signalling form a complex network regulating the transcription of chloroplast- and photosynthesis-related genes to control the development and number of chloroplasts per cell. We use this conceptual framework to identify points of regulation that could be harnessed to modulate chloroplast abundance and increase photosynthetic efficiency of crops, and to highlight future avenues to overcome gaps in current knowledge.
    MeSH term(s) Arabidopsis Proteins/metabolism ; Chloroplasts/metabolism ; Gene Expression Regulation, Plant ; Hormones/metabolism ; Light ; Photosynthesis/genetics ; Plant Leaves/physiology ; Viridiplantae/metabolism
    Chemical Substances Arabidopsis Proteins ; Hormones
    Language English
    Publishing date 2021-11-24
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 208885-x
    ISSN 1469-8137 ; 0028-646X
    ISSN (online) 1469-8137
    ISSN 0028-646X
    DOI 10.1111/nph.17839
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  8. Article ; Online: Biogenesis and homeostasis of chloroplasts and other plastids.

    Jarvis, Paul / López-Juez, Enrique

    Nature reviews. Molecular cell biology

    2013  Volume 14, Issue 12, Page(s) 787–802

    Abstract: Chloroplasts are the organelles that define plants, and they are responsible for photosynthesis as well as numerous other functions. They are the ancestral members of a family of organelles known as plastids. Plastids are remarkably dynamic, existing in ... ...

    Abstract Chloroplasts are the organelles that define plants, and they are responsible for photosynthesis as well as numerous other functions. They are the ancestral members of a family of organelles known as plastids. Plastids are remarkably dynamic, existing in strikingly different forms that interconvert in response to developmental or environmental cues. The genetic system of this organelle and its coordination with the nucleocytosolic system, the import and routing of nucleus-encoded proteins, as well as organellar division all contribute to the biogenesis and homeostasis of plastids. They are controlled by the ubiquitin-proteasome system, which is part of a network of regulatory mechanisms that integrate plastid development into broader programmes of cellular and organismal development.
    MeSH term(s) Animals ; Arabidopsis/cytology ; Arabidopsis/physiology ; Chloroplasts/physiology ; Genome, Plastid ; Homeostasis ; Humans ; Organelle Size ; Plant Leaves/cytology ; Plant Leaves/physiology ; Plant Proteins/metabolism ; Protein Transport ; Proteolysis ; Signal Transduction
    Chemical Substances Plant Proteins
    Language English
    Publishing date 2013-11-19
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 2031313-5
    ISSN 1471-0080 ; 1471-0072
    ISSN (online) 1471-0080
    ISSN 1471-0072
    DOI 10.1038/nrm3702
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  9. Article ; Online: Steering the solar panel: plastids influence development.

    López-Juez, Enrique

    The New phytologist

    2009  Volume 182, Issue 2, Page(s) 287–290

    MeSH term(s) Chloroplasts/genetics ; Chloroplasts/physiology ; Light ; Photosynthesis ; Plant Development ; Plant Physiological Phenomena ; Signal Transduction
    Language English
    Publishing date 2009-03-06
    Publishing country England
    Document type Journal Article ; Comment
    ZDB-ID 208885-x
    ISSN 1469-8137 ; 0028-646X
    ISSN (online) 1469-8137
    ISSN 0028-646X
    DOI 10.1111/j.1469-8137.2009.02808.x
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  10. Article: Chloroplast Biogenesis-Associated Nuclear Genes: Control by Plastid Signals Evolved Prior to Their Regulation as Part of Photomorphogenesis.

    Hills, Alison C / Khan, Safina / López-Juez, Enrique

    Frontiers in plant science

    2015  Volume 6, Page(s) 1078

    Abstract: The assembly of photosynthetically competent chloroplasts occurs in angiosperm seedlings when first exposed to light, and is due to the control by light of photosynthesis-associated nuclear genes (PhANGs), also dependent upon plastid-to-nucleus "biogenic" ...

    Abstract The assembly of photosynthetically competent chloroplasts occurs in angiosperm seedlings when first exposed to light, and is due to the control by light of photosynthesis-associated nuclear genes (PhANGs), also dependent upon plastid-to-nucleus "biogenic" communication signals. The relationship between light- and plastid signal-regulation of PhANGs is close but poorly understood. In contrast, many conifers green in the dark and the promoter of a pine PhANG, Lhcb, is active in the dark in tobacco. Here, we show that the activity of this promoter in tobacco is sensitive to plastid photobleaching, or to the inhibition of plastid translation in the light or the dark, and the same interventions reduce expression of the native gene in pine seedlings, demonstrating classic plastid biogenic signaling in gymnosperms. Furthermore, Arabidopsis mutations causing defective plastid biogenesis suppress the effect in darkness of mutations in COP1 and DET1, repressors of photomorphogenesis, for the expression of several PhANGs but not a photosynthesis-unrelated, light-regulated gene. GLK transcriptional regulators mediate the response of LHCB but not of other tested PhANGs. We propose the ability to suppress PhANG response to positive plastid biogenic signals in the dark may have contributed to the evolution of light-controlled chloroplast biogenesis.
    Language English
    Publishing date 2015-12-10
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2711035-7
    ISSN 1664-462X
    ISSN 1664-462X
    DOI 10.3389/fpls.2015.01078
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