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7 results on '"Carré, Wilfrid"'

1. Integrated clinical and omics approach to rare diseases : Novel genes and oligogenic inheritance in holoprosencephaly

Author

Kim, Artem, Savary, Clara, Dubourg, Christèle, Carré, Wilfrid, Mouden, Charlotte, Hamdi-Rozé, Houda, Guyodo, Hélène, Douce, Jerome Le, Génin, Emmanuelle, Campion, Dominique, Dartigues, Jean François, Deleuze, Jean François, Lambert, Jean Charles, Redon, Richard, Ludwig, Thomas, Grenier-Boley, Benjamin, Letort, Sébastien, Lindenbaum, Pierre, Meyer, Vincent, Quenez, Olivier, Dina, Christian, Bellenguez, Céline, Charbonnier-Le Clézio, Camille, Giemza, Joanna, Chatel, Stéphanie, Férec, Claude, Le Marec, Hervé, Letenneur, Luc, Nicolas, Gaël, Rouault, Karen, Bacq, Delphine, Boland, Anne, Lechner, Doris, Wijmenga, Cisca, Swertz, Morris A., Eline Slagboom, P., Van Ommen, Gert Jan B., Van Duijn, Cornelia M., Boomsma, Dorret I., De Bakker, Paul I.W., Bovenberg, Jasper A., De Craen, Anton J.M., Beekman, Marian, Hofman, Albert, Willemsen, Gonneke, Wolffenbuttel, Bruce, Platteel, Mathieu, Du, Yuanping, Chen, Ruoyan, Cao, Hongzhi, Cao, Rui, Sun, Yushen, Sujie Cao, Jeremy, Van Dijk, Freerk, Neerincx, Pieter B.T., Deelen, Patrick, Dijkstra, Martijn, Byelas, George, Kanterakis, Alexandros, Bot, Jan, Ye, Kai, Lameijer, Eric Wubbo, Vermaat, Martijn, Laros, Jeroen F.J., Den Dunnen, Johan T., De Knijff, Peter, Karssen, Lennart C., Van Leeuwen, Elisa M., Amin, Najaf, Koval, Vyacheslav, Rivadeneira, Fernando, Estrada, Karol, Hehir-Kwa, Jayne Y., De Ligt, Joep, Abdellaoui, Abdel, Hottenga, Jouke Jan, Mathijs Kattenberg, V., Van Enckevort, David, Mei, Hailiang, Santcroos, Mark, Van Schaik, Barbera D.C., Handsaker, Robert E., McCarroll, Steven A., Eichler, Evan E., Ko, Arthur, Sudmant, Peter, Francioli, Laurent C., Kloosterman, Wigard P., Nijman, Isaac J., Guryev, Victor, Pasquier, Laurent, Flori, Elisabeth, Gonzales, Marie, Bénéteau, Claire, Boute, Odile, Attié-Bitach, Tania, Roume, Joelle, Goujon, Louise, Akloul, Linda, Odent, Sylvie, Watrin, Erwan, Dupé, Valérie, De Tayrac, Marie, David, Véronique, Kim, Artem, Savary, Clara, Dubourg, Christèle, Carré, Wilfrid, Mouden, Charlotte, Hamdi-Rozé, Houda, Guyodo, Hélène, Douce, Jerome Le, Génin, Emmanuelle, Campion, Dominique, Dartigues, Jean François, Deleuze, Jean François, Lambert, Jean Charles, Redon, Richard, Ludwig, Thomas, Grenier-Boley, Benjamin, Letort, Sébastien, Lindenbaum, Pierre, Meyer, Vincent, Quenez, Olivier, Dina, Christian, Bellenguez, Céline, Charbonnier-Le Clézio, Camille, Giemza, Joanna, Chatel, Stéphanie, Férec, Claude, Le Marec, Hervé, Letenneur, Luc, Nicolas, Gaël, Rouault, Karen, Bacq, Delphine, Boland, Anne, Lechner, Doris, Wijmenga, Cisca, Swertz, Morris A., Eline Slagboom, P., Van Ommen, Gert Jan B., Van Duijn, Cornelia M., Boomsma, Dorret I., De Bakker, Paul I.W., Bovenberg, Jasper A., De Craen, Anton J.M., Beekman, Marian, Hofman, Albert, Willemsen, Gonneke, Wolffenbuttel, Bruce, Platteel, Mathieu, Du, Yuanping, Chen, Ruoyan, Cao, Hongzhi, Cao, Rui, Sun, Yushen, Sujie Cao, Jeremy, Van Dijk, Freerk, Neerincx, Pieter B.T., Deelen, Patrick, Dijkstra, Martijn, Byelas, George, Kanterakis, Alexandros, Bot, Jan, Ye, Kai, Lameijer, Eric Wubbo, Vermaat, Martijn, Laros, Jeroen F.J., Den Dunnen, Johan T., De Knijff, Peter, Karssen, Lennart C., Van Leeuwen, Elisa M., Amin, Najaf, Koval, Vyacheslav, Rivadeneira, Fernando, Estrada, Karol, Hehir-Kwa, Jayne Y., De Ligt, Joep, Abdellaoui, Abdel, Hottenga, Jouke Jan, Mathijs Kattenberg, V., Van Enckevort, David, Mei, Hailiang, Santcroos, Mark, Van Schaik, Barbera D.C., Handsaker, Robert E., McCarroll, Steven A., Eichler, Evan E., Ko, Arthur, Sudmant, Peter, Francioli, Laurent C., Kloosterman, Wigard P., Nijman, Isaac J., Guryev, Victor, Pasquier, Laurent, Flori, Elisabeth, Gonzales, Marie, Bénéteau, Claire, Boute, Odile, Attié-Bitach, Tania, Roume, Joelle, Goujon, Louise, Akloul, Linda, Odent, Sylvie, Watrin, Erwan, Dupé, Valérie, De Tayrac, Marie, and David, Véronique

Published
2019

2. Integrated clinical and omics approach to rare diseases: Novel genes and oligogenic inheritance in holoprosencephaly

Author

CMM Groep Kaaij, Genetica Klinische Genetica, Cancer, CMM Groep De Ridder, Child Health, CMM Groep Kloosterman, CMM USEQ Facility, Hubrecht Institute with UMC, Kim, Artem, Savary, Clara, Dubourg, Christèle, Carré, Wilfrid, Mouden, Charlotte, Hamdi-Rozé, Houda, Guyodo, Hélène, Douce, Jerome Le, Génin, Emmanuelle, Campion, Dominique, Dartigues, Jean François, Deleuze, Jean François, Lambert, Jean Charles, Redon, Richard, Ludwig, Thomas, Grenier-Boley, Benjamin, Letort, Sébastien, Lindenbaum, Pierre, Meyer, Vincent, Quenez, Olivier, Dina, Christian, Bellenguez, Céline, Charbonnier-Le Clézio, Camille, Giemza, Joanna, Chatel, Stéphanie, Férec, Claude, Le Marec, Hervé, Letenneur, Luc, Nicolas, Gaël, Rouault, Karen, Bacq, Delphine, Boland, Anne, Lechner, Doris, Wijmenga, Cisca, Swertz, Morris A., Eline Slagboom, P., Van Ommen, Gert Jan B., Van Duijn, Cornelia M., Boomsma, Dorret I., De Bakker, Paul I.W., Bovenberg, Jasper A., De Craen, Anton J.M., Beekman, Marian, Hofman, Albert, Willemsen, Gonneke, Wolffenbuttel, Bruce, Platteel, Mathieu, Du, Yuanping, Chen, Ruoyan, Cao, Hongzhi, Cao, Rui, Sun, Yushen, Sujie Cao, Jeremy, Van Dijk, Freerk, Neerincx, Pieter B.T., Deelen, Patrick, Dijkstra, Martijn, Byelas, George, Kanterakis, Alexandros, Bot, Jan, Ye, Kai, Lameijer, Eric Wubbo, Vermaat, Martijn, Laros, Jeroen F.J., Den Dunnen, Johan T., De Knijff, Peter, Karssen, Lennart C., Van Leeuwen, Elisa M., Amin, Najaf, Koval, Vyacheslav, Rivadeneira, Fernando, Estrada, Karol, Hehir-Kwa, Jayne Y., De Ligt, Joep, Abdellaoui, Abdel, Hottenga, Jouke Jan, Mathijs Kattenberg, V., Van Enckevort, David, Mei, Hailiang, Santcroos, Mark, Van Schaik, Barbera D.C., Handsaker, Robert E., McCarroll, Steven A., Eichler, Evan E., Ko, Arthur, Sudmant, Peter, Francioli, Laurent C., Kloosterman, Wigard P., Nijman, Isaac J., Guryev, Victor, Pasquier, Laurent, Flori, Elisabeth, Gonzales, Marie, Bénéteau, Claire, Boute, Odile, Attié-Bitach, Tania, Roume, Joelle, Goujon, Louise, Akloul, Linda, Odent, Sylvie, Watrin, Erwan, Dupé, Valérie, De Tayrac, Marie, David, Véronique, CMM Groep Kaaij, Genetica Klinische Genetica, Cancer, CMM Groep De Ridder, Child Health, CMM Groep Kloosterman, CMM USEQ Facility, Hubrecht Institute with UMC, Kim, Artem, Savary, Clara, Dubourg, Christèle, Carré, Wilfrid, Mouden, Charlotte, Hamdi-Rozé, Houda, Guyodo, Hélène, Douce, Jerome Le, Génin, Emmanuelle, Campion, Dominique, Dartigues, Jean François, Deleuze, Jean François, Lambert, Jean Charles, Redon, Richard, Ludwig, Thomas, Grenier-Boley, Benjamin, Letort, Sébastien, Lindenbaum, Pierre, Meyer, Vincent, Quenez, Olivier, Dina, Christian, Bellenguez, Céline, Charbonnier-Le Clézio, Camille, Giemza, Joanna, Chatel, Stéphanie, Férec, Claude, Le Marec, Hervé, Letenneur, Luc, Nicolas, Gaël, Rouault, Karen, Bacq, Delphine, Boland, Anne, Lechner, Doris, Wijmenga, Cisca, Swertz, Morris A., Eline Slagboom, P., Van Ommen, Gert Jan B., Van Duijn, Cornelia M., Boomsma, Dorret I., De Bakker, Paul I.W., Bovenberg, Jasper A., De Craen, Anton J.M., Beekman, Marian, Hofman, Albert, Willemsen, Gonneke, Wolffenbuttel, Bruce, Platteel, Mathieu, Du, Yuanping, Chen, Ruoyan, Cao, Hongzhi, Cao, Rui, Sun, Yushen, Sujie Cao, Jeremy, Van Dijk, Freerk, Neerincx, Pieter B.T., Deelen, Patrick, Dijkstra, Martijn, Byelas, George, Kanterakis, Alexandros, Bot, Jan, Ye, Kai, Lameijer, Eric Wubbo, Vermaat, Martijn, Laros, Jeroen F.J., Den Dunnen, Johan T., De Knijff, Peter, Karssen, Lennart C., Van Leeuwen, Elisa M., Amin, Najaf, Koval, Vyacheslav, Rivadeneira, Fernando, Estrada, Karol, Hehir-Kwa, Jayne Y., De Ligt, Joep, Abdellaoui, Abdel, Hottenga, Jouke Jan, Mathijs Kattenberg, V., Van Enckevort, David, Mei, Hailiang, Santcroos, Mark, Van Schaik, Barbera D.C., Handsaker, Robert E., McCarroll, Steven A., Eichler, Evan E., Ko, Arthur, Sudmant, Peter, Francioli, Laurent C., Kloosterman, Wigard P., Nijman, Isaac J., Guryev, Victor, Pasquier, Laurent, Flori, Elisabeth, Gonzales, Marie, Bénéteau, Claire, Boute, Odile, Attié-Bitach, Tania, Roume, Joelle, Goujon, Louise, Akloul, Linda, Odent, Sylvie, Watrin, Erwan, Dupé, Valérie, De Tayrac, Marie, and David, Véronique

Published
2019

3. HCN1 mutation spectrum: From neonatal epileptic encephalopathy to benign generalized epilepsy and beyond

Author

Genetica Klinische Genetica, Brain, Child Health, Genetica Groep Koeleman, Circulatory Health, Marini, Carla, Porro, Alessandro, Rastetter, Agnès, Dalle, Carine, Rivolta, Ilaria, Bauer, Daniel, Oegema, Renske, Nava, Caroline, Parrini, Elena, Mei, Davide, Mercer, Catherine, Dhamija, Radhika, Chambers, Chelsea, Coubes, Christine, Thévenon, Julien, Kuentz, Paul, Julia, Sophie, Pasquier, Laurent, Dubourg, Christèle, Carré, Wilfrid, Rosati, Anna, Melani, Federico, Pisano, Tiziana, Giardino, Maria, Innes, A. Micheil, Alembik, Yves, Scheidecker, Sophie, Santos, Manuela, Figueiroa, Sonia, Garrido, Cristina, Fusco, Carlo, Frattini, Daniele, Spagnoli, Carlotta, Binda, Anna, Granata, Tiziana, Ragona, Francesca, Freri, Elena, Franceschetti, Silvana, Canafoglia, Laura, Castellotti, Barbara, Gellera, Cinzia, Milanesi, Raffaella, Mancardi, Maria Margherita, Clark, Damien R., Kok, Fernando, Helbig, Katherine L., Ichikawa, Shoji, Sadler, Laurie, Neupauerová, Jana, Laššuthova, Petra, Štěrbová, Katalin, Laridon, Annick, Brilstra, Eva, Koeleman, Bobby, Lemke, Johannes R., Zara, Federico, Striano, Pasquale, Soblet, Julie, Smits, Guillaume, Deconinck, Nicolas, Barbuti, Andrea, Difrancesco, Dario, Leguern, Eric, Guerrini, Renzo, Santoro, Bina, Hamacher, Kay, Thiel, Gerhard, Moroni, Anna, Difrancesco, Jacopo C., Depienne, Christel, Genetica Klinische Genetica, Brain, Child Health, Genetica Groep Koeleman, Circulatory Health, Marini, Carla, Porro, Alessandro, Rastetter, Agnès, Dalle, Carine, Rivolta, Ilaria, Bauer, Daniel, Oegema, Renske, Nava, Caroline, Parrini, Elena, Mei, Davide, Mercer, Catherine, Dhamija, Radhika, Chambers, Chelsea, Coubes, Christine, Thévenon, Julien, Kuentz, Paul, Julia, Sophie, Pasquier, Laurent, Dubourg, Christèle, Carré, Wilfrid, Rosati, Anna, Melani, Federico, Pisano, Tiziana, Giardino, Maria, Innes, A. Micheil, Alembik, Yves, Scheidecker, Sophie, Santos, Manuela, Figueiroa, Sonia, Garrido, Cristina, Fusco, Carlo, Frattini, Daniele, Spagnoli, Carlotta, Binda, Anna, Granata, Tiziana, Ragona, Francesca, Freri, Elena, Franceschetti, Silvana, Canafoglia, Laura, Castellotti, Barbara, Gellera, Cinzia, Milanesi, Raffaella, Mancardi, Maria Margherita, Clark, Damien R., Kok, Fernando, Helbig, Katherine L., Ichikawa, Shoji, Sadler, Laurie, Neupauerová, Jana, Laššuthova, Petra, Štěrbová, Katalin, Laridon, Annick, Brilstra, Eva, Koeleman, Bobby, Lemke, Johannes R., Zara, Federico, Striano, Pasquale, Soblet, Julie, Smits, Guillaume, Deconinck, Nicolas, Barbuti, Andrea, Difrancesco, Dario, Leguern, Eric, Guerrini, Renzo, Santoro, Bina, Hamacher, Kay, Thiel, Gerhard, Moroni, Anna, Difrancesco, Jacopo C., and Depienne, Christel

Published
2018

4. Disrupted Hypothalamo-Pituitary Axis in Association With Reduced SHH Underlies the Pathogenesis of NOTCH-Deficiency.

Author

Hamdi-Rozé H, Ware M, Guyodo H, Rizzo A, Ratié L, Rupin M, Carré W, Kim A, Odent S, Dubourg C, David V, de Tayrac M, and Dupé V

Subjects
Animals, Cells, Cultured, Chick Embryo, Cohort Studies, Disease Models, Animal, Embryo, Mammalian, Female, Haploinsufficiency genetics, Hedgehog Proteins metabolism, Holoprosencephaly metabolism, Holoprosencephaly pathology, Holoprosencephaly physiopathology, Humans, Hypothalamo-Hypophyseal System pathology, Male, Mice, Mice, Transgenic, Pregnancy, Receptors, Notch deficiency, Retrospective Studies, Signal Transduction genetics, Hedgehog Proteins genetics, Holoprosencephaly genetics, Hypothalamo-Hypophyseal System metabolism, Receptors, Notch genetics
Abstract

Context: In human, Sonic hedgehog (SHH) haploinsufficiency is the predominant cause of holoprosencephaly, a structural malformation of the forebrain midline characterized by phenotypic heterogeneity and incomplete penetrance. The NOTCH signaling pathway has recently been associated with holoprosencephaly in humans, but the precise mechanism involving NOTCH signaling during early brain development remains unknown., Objective: The aim of this study was to evaluate the relationship between SHH and NOTCH signaling to determine the mechanism by which NOTCH dysfunction could cause midline malformations of the forebrain., Design: In this study, we have used a chemical inhibition approach in the chick model and a genetic approach in the mouse model. We also reported results obtained from the clinical diagnosis of a cohort composed of 141 holoprosencephaly patients., Results: We demonstrated that inhibition of NOTCH signaling in chick embryos as well as in mouse embryos induced a specific downregulation of SHH in the anterior hypothalamus. Our data in the mouse also revealed that the pituitary gland was the most sensitive tissue to Shh insufficiency and that haploinsufficiency of the SHH and NOTCH signaling pathways synergized to produce a malformed pituitary gland. Analysis of a large holoprosencephaly cohort revealed that some patients possessed multiple heterozygous mutations in several regulators of both pathways., Conclusions: These results provided new insights into molecular mechanisms underlying the extreme phenotypic variability observed in human holoprosencephaly. They showed how haploinsufficiency of the SHH and NOTCH activity could contribute to specific congenital hypopituitarism that was associated with a sella turcica defect., (© Endocrine Society 2020. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.)

Published
2020
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5. Integrated clinical and omics approach to rare diseases: novel genes and oligogenic inheritance in holoprosencephaly.

Author

Kim A, Savary C, Dubourg C, Carré W, Mouden C, Hamdi-Rozé H, Guyodo H, Douce JL, Pasquier L, Flori E, Gonzales M, Bénéteau C, Boute O, Attié-Bitach T, Roume J, Goujon L, Akloul L, Odent S, Watrin E, Dupé V, de Tayrac M, and David V

Subjects
Case-Control Studies, Comparative Genomic Hybridization, Exome genetics, Female, Humans, Male, Mutation, Pedigree, Phenotype, Holoprosencephaly genetics, Multifactorial Inheritance genetics, Rare Diseases genetics
Abstract

Holoprosencephaly is a pathology of forebrain development characterized by high phenotypic heterogeneity. The disease presents with various clinical manifestations at the cerebral or facial levels. Several genes have been implicated in holoprosencephaly but its genetic basis remains unclear: different transmission patterns have been described including autosomal dominant, recessive and digenic inheritance. Conventional molecular testing approaches result in a very low diagnostic yield and most cases remain unsolved. In our study, we address the possibility that genetically unsolved cases of holoprosencephaly present an oligogenic origin and result from combined inherited mutations in several genes. Twenty-six unrelated families, for whom no genetic cause of holoprosencephaly could be identified in clinical settings [whole exome sequencing and comparative genomic hybridization (CGH)-array analyses], were reanalysed under the hypothesis of oligogenic inheritance. Standard variant analysis was improved with a gene prioritization strategy based on clinical ontologies and gene co-expression networks. Clinical phenotyping and exploration of cross-species similarities were further performed on a family-by-family basis. Statistical validation was performed on 248 ancestrally similar control trios provided by the Genome of the Netherlands project and on 574 ancestrally matched controls provided by the French Exome Project. Variants of clinical interest were identified in 180 genes significantly associated with key pathways of forebrain development including sonic hedgehog (SHH) and primary cilia. Oligogenic events were observed in 10 families and involved both known and novel holoprosencephaly genes including recurrently mutated FAT1, NDST1, COL2A1 and SCUBE2. The incidence of oligogenic combinations was significantly higher in holoprosencephaly patients compared to two control populations (P < 10-9). We also show that depending on the affected genes, patients present with particular clinical features. This study reports novel disease genes and supports oligogenicity as clinically relevant model in holoprosencephaly. It also highlights key roles of SHH signalling and primary cilia in forebrain development. We hypothesize that distinction between different clinical manifestations of holoprosencephaly lies in the degree of overall functional impact on SHH signalling. Finally, we underline that integrating clinical phenotyping in genetic studies is a powerful tool to specify the clinical relevance of certain mutations.

Published
2019
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6. HCN1 mutation spectrum: from neonatal epileptic encephalopathy to benign generalized epilepsy and beyond.

Author

Marini C, Porro A, Rastetter A, Dalle C, Rivolta I, Bauer D, Oegema R, Nava C, Parrini E, Mei D, Mercer C, Dhamija R, Chambers C, Coubes C, Thévenon J, Kuentz P, Julia S, Pasquier L, Dubourg C, Carré W, Rosati A, Melani F, Pisano T, Giardino M, Innes AM, Alembik Y, Scheidecker S, Santos M, Figueiroa S, Garrido C, Fusco C, Frattini D, Spagnoli C, Binda A, Granata T, Ragona F, Freri E, Franceschetti S, Canafoglia L, Castellotti B, Gellera C, Milanesi R, Mancardi MM, Clark DR, Kok F, Helbig KL, Ichikawa S, Sadler L, Neupauerová J, Laššuthova P, Šterbová K, Laridon A, Brilstra E, Koeleman B, Lemke JR, Zara F, Striano P, Soblet J, Smits G, Deconinck N, Barbuti A, DiFrancesco D, LeGuern E, Guerrini R, Santoro B, Hamacher K, Thiel G, Moroni A, DiFrancesco JC, and Depienne C

Subjects
Adolescent, Adult, Aged, Animals, CHO Cells, Child, Child, Preschool, Cricetulus, Electric Stimulation, Female, Genetic Association Studies, Humans, Infant, Male, Membrane Potentials genetics, Middle Aged, Models, Molecular, Mutagenesis, Site-Directed methods, Young Adult, Epilepsy, Generalized genetics, Hyperpolarization-Activated Cyclic Nucleotide-Gated Channels genetics, Mutation genetics, Potassium Channels genetics, Spasms, Infantile genetics
Abstract

Hyperpolarization-activated cyclic nucleotide-gated (HCN) channels control neuronal excitability and their dysfunction has been linked to epileptogenesis but few individuals with neurological disorders related to variants altering HCN channels have been reported so far. In 2014, we described five individuals with epileptic encephalopathy due to de novo HCN1 variants. To delineate HCN1-related disorders and investigate genotype-phenotype correlations further, we assembled a cohort of 33 unpublished patients with novel pathogenic or likely pathogenic variants: 19 probands carrying 14 different de novo mutations and four families with dominantly inherited variants segregating with epilepsy in 14 individuals, but not penetrant in six additional individuals. Sporadic patients had epilepsy with median onset at age 7 months and in 36% the first seizure occurred during a febrile illness. Overall, considering familial and sporadic patients, the predominant phenotypes were mild, including genetic generalized epilepsies and genetic epilepsy with febrile seizures plus (GEFS+) spectrum. About 20% manifested neonatal/infantile onset otherwise unclassified epileptic encephalopathy. The study also included eight patients with variants of unknown significance: one adopted patient had two HCN1 variants, four probands had intellectual disability without seizures, and three individuals had missense variants inherited from an asymptomatic parent. Of the 18 novel pathogenic missense variants identified, 12 were associated with severe phenotypes and clustered within or close to transmembrane domains, while variants segregating with milder phenotypes were located outside transmembrane domains, in the intracellular N- and C-terminal parts of the channel. Five recurrent variants were associated with similar phenotypes. Using whole-cell patch-clamp, we showed that the impact of 12 selected variants ranged from complete loss-of-function to significant shifts in activation kinetics and/or voltage dependence. Functional analysis of three different substitutions altering Gly391 revealed that these variants had different consequences on channel biophysical properties. The Gly391Asp variant, associated with the most severe, neonatal phenotype, also had the most severe impact on channel function. Molecular dynamics simulation on channel structure showed that homotetramers were not conducting ions because the permeation path was blocked by cation(s) strongly complexed to the Asp residue, whereas heterotetramers showed an instantaneous current component possibly linked to deformation of the channel pore. In conclusion, our results considerably expand the clinical spectrum related to HCN1 variants to include common generalized epilepsy phenotypes and further illustrate how HCN1 has a pivotal function in brain development and control of neuronal excitability.

Published
2018
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7. microRNAs and the evolution of complex multicellularity: identification of a large, diverse complement of microRNAs in the brown alga Ectocarpus.

Author

Tarver JE, Cormier A, Pinzón N, Taylor RS, Carré W, Strittmatter M, Seitz H, Coelho SM, and Cock JM

Subjects
Genetic Loci, Genetic Variation, Genome, MicroRNAs chemistry, MicroRNAs classification, MicroRNAs metabolism, Phaeophyceae metabolism, Polymerase Chain Reaction, Sequence Analysis, RNA, Evolution, Molecular, MicroRNAs genetics, Phaeophyceae genetics
Abstract

There is currently convincing evidence that microRNAs have evolved independently in at least six different eukaryotic lineages: animals, land plants, chlorophyte green algae, demosponges, slime molds and brown algae. MicroRNAs from different lineages are not homologous but some structural features are strongly conserved across the eukaryotic tree allowing the application of stringent criteria to identify novel microRNA loci. A large set of 63 microRNA families was identified in the brown alga Ectocarpus based on mapping of RNA-seq data and nine microRNAs were confirmed by northern blotting. The Ectocarpus microRNAs are highly diverse at the sequence level with few multi-gene families, and do not tend to occur in clusters but exhibit some highly conserved structural features such as the presence of a uracil at the first residue. No homologues of Ectocarpus microRNAs were found in other stramenopile genomes indicating that they emerged late in stramenopile evolution and are perhaps specific to the brown algae. The large number of microRNA loci in Ectocarpus is consistent with the developmental complexity of many brown algal species and supports a proposed link between the emergence and expansion of microRNA regulatory systems and the evolution of complex multicellularity., (© The Author(s) 2015. Published by Oxford University Press on behalf of Nucleic Acids Research.)

Published
2015
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