Volvox germline-specific genes that are putative targets of RegA repression encode chloroplast proteins

Meissner, Markus; Stark, Klaus; Črešnar, Bronislava; Kirk, David L.; Schmitt, Rüdiger

doi:10.1007/s002940050511

Cited by 58 publications

(48 citation statements)

References 39 publications

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“…However, a homologue to suV (GenBank™ accession number AF110791) was identified among cDNAs from Volvox (19), which is a another green alga closely related to C. reinhardtii. A BLASTP 2.0 alignment (35) showed 147 identities out of the 198 residues of suV from C. reinhardtii.…”

Section: Resultsmentioning

confidence: 99%

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A New Subunit of Cytochromeb 6 f Complex Undergoes Reversible Phosphorylation upon State Transition

Hamel

Olive

Pierre

et al. 2000

Journal of Biological Chemistry

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A 15.2-kDa polypeptide, encoded by the nuclear gene PETO, was identified as a novel cytochrome b 6 f subunit in Chlamydomonas reinhardtii. The PETO gene product is a bona fide subunit, subunit V, of the cytochrome b 6 f complex, because (i) it copurifies with the other cytochrome b 6 f subunits in the early stages of the purification procedure, (ii) it is deficient in cytochrome b 6 f mutants accumulating little of the complex, and (iii) it colocalizes with cytochrome f, which migrates between stacked and unstacked membrane regions upon state transition. Sequence analysis and biochemical characterization of subunit V shows that it has a one transmembrane ␣-helix topology with two large hydrophilic domains extending on the stromal and lumenal side of the thylakoid membranes, with a lumenal location of the N terminus. Subunit V is reversibly phosphorylated upon state transition, a unique feature that, together with its topological organization, points to the possible role of subunit V in signal transduction during redoxcontrolled short term and long term adaptation of the photosynthetic apparatus in eukaryotes.

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Section: Resultsmentioning

confidence: 99%

“…Recently, a putative fourth small subunit has been identified as a product of a chloroplast gene petN in higher plants (18). This gene is located in the nucleus in Volvox (19) and in C. reinhardtii as suggested by homologies to expressed sequence tags (20).…”

mentioning

confidence: 99%

A New Subunit of Cytochromeb 6 f Complex Undergoes Reversible Phosphorylation upon State Transition

Hamel

Olive

Pierre

et al. 2000

Journal of Biological Chemistry

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“…V. carteri consists of Ϸ2,000 permanently biflagellated somatic cells and up to 16 nonflagellated reproductive cells. Terminal differentiation of somatic cells in V. carteri involves the expression of regA, a master regulatory gene that encodes a transcriptional repressor (16) thought to suppress several nuclear genes coding for chloroplast proteins (17). Consequently, the cell growth (dependent on photosynthesis) and division (dependent on cell growth) of somatic cells are suppressed.…”

Section: Origin Of Reproductive Altruismmentioning

confidence: 99%

Evolution of individuality during the transition from unicellular to multicellular life

Michod

2007

Proc. Natl. Acad. Sci. U.S.A.

272

251

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Individuality is a complex trait, yet a series of stages each advantageous in itself can be shown to exist allowing evolution to get from unicellular individuals to multicellular individuals. We consider several of the key stages involved in this transition: the initial advantage of group formation, the origin of reproductive altruism within the group, and the further specialization of cell types as groups increase in size. How do groups become individuals? This is the central question we address. Our hypothesis is that fitness tradeoffs drive the transition of a cell group into a multicellular individual through the evolution of cells specialized at reproductive and vegetative functions of the group. We have modeled this hypothesis and have tested our models in two ways. We have studied the origin of the genetic basis for reproductive altruism (somatic cells specialized at vegetative functions) in the multicellular Volvox carteri by showing how an altruistic gene may have originated through cooption of a life-history tradeoff gene present in a unicellular ancestor. Second, we ask why reproductive altruism and individuality arise only in the larger members of the volvocine group (recognizing that high levels of kinship are present in all volvocine algae groups). Our answer is that the selective pressures leading to reproductive altruism stem from the increasing cost of reproduction with increasing group size. Concepts from population genetics and evolutionary biology appear to be sufficient to explain complexity, at least as it relates to the problem of the major transitions between the different kinds of evolutionary individuals.evolutionary transitions ͉ multicellularity ͉ Volvox

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“…During this process regA which is a regulatory gene and encodes a transcriptional repressor begins to express [36]. As a result, several nuclear genes which are responsible for coding the chloroplast proteins are suppressed [37]. Consequently, these somatic cells will not go under the cell growth or division.…”

Section: A New Approach For Groupingmentioning

confidence: 99%

From nature to maths: Improving forecasting performance in subspace-based methods using genetics Colonial Theory

Hassani

Ghodsi

Silva

et al. 2016

Digital Signal Processing

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Many scientific fields consider accurate and reliable forecasting methods as important decision-making tools in the modern age amidst increasing volatility and uncertainty. As such there exists an opportune demand for theoretical developments which can result in more accurate forecasts. Inspired by Colonial Theory, this paper seeks to bring about considerable improvements to the field of time series analysis and forecasting by identifying certain core characteristics of Colonial Theory which are subsequently exploited in introducing a novel approach for the grouping step of subspace based methods. The proposed algorithm shows promising results in terms of improved performances in noise filtering and forecasting of time series. The reliability and validity of the proposed algorithm is evaluated and compared with popular forecasting models with the results being thoroughly evaluated for statistical significance and thereby adding more confidence and value to the findings of this research.

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Volvox germline-specific genes that are putative targets of RegA repression encode chloroplast proteins

Cited by 58 publications

References 39 publications

A New Subunit of Cytochromeb 6 f Complex Undergoes Reversible Phosphorylation upon State Transition

A New Subunit of Cytochromeb 6 f Complex Undergoes Reversible Phosphorylation upon State Transition

Evolution of individuality during the transition from unicellular to multicellular life

From nature to maths: Improving forecasting performance in subspace-based methods using genetics Colonial Theory

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