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Intragenomic variation in nuclear ribosomal markers and its implication in species delimitation, identification and barcoding in fungi. FUNGAL BIOL REV 2022. [DOI: 10.1016/j.fbr.2022.04.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Bradshaw M, Grewe F, Thomas A, Harrison CH, Lindgren H, Muggia L, St Clair LL, Lumbsch HT, Leavitt SD. Characterizing the ribosomal tandem repeat and its utility as a DNA barcode in lichen-forming fungi. BMC Evol Biol 2020; 20:2. [PMID: 31906844 PMCID: PMC6945747 DOI: 10.1186/s12862-019-1571-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Accepted: 12/19/2019] [Indexed: 02/08/2023] Open
Abstract
Background Regions within the nuclear ribosomal operon are a major tool for inferring evolutionary relationships and investigating diversity in fungi. In spite of the prevalent use of ribosomal markers in fungal research, central features of nuclear ribosomal DNA (nrDNA) evolution are poorly characterized for fungi in general, including lichenized fungi. The internal transcribed spacer (ITS) region of the nrDNA has been adopted as the primary DNA barcode identification marker for fungi. However, little is known about intragenomic variation in the nrDNA in symbiotic fungi. In order to better understand evolution of nrDNA and the utility of the ITS region for barcode identification of lichen-forming fungal species, we generated nearly complete nuclear ribosomal operon sequences from nine species in the Rhizoplaca melanophthalma species complex using short reads from high-throughput sequencing. Results We estimated copy numbers for the nrDNA operon, ranging from nine to 48 copies for members of this complex, and found low levels of intragenomic variation in the standard barcode region (ITS). Monophyly of currently described species in this complex was supported in phylogenetic inferences based on the ITS, 28S, intergenic spacer region, and some intronic regions, independently; however, a phylogenetic inference based on the 18S provided much lower resolution. Phylogenetic analysis of concatenated ITS and intergenic spacer sequence data generated from 496 specimens collected worldwide revealed previously unrecognized lineages in the nrDNA phylogeny. Conclusions The results from our study support the general assumption that the ITS region of the nrDNA is an effective barcoding marker for fungi. For the R. melanophthalma group, the limited amount of potential intragenomic variability in the ITS region did not correspond to fixed diagnostic nucleotide position characters separating taxa within this species complex. Previously unrecognized lineages inferred from ITS sequence data may represent undescribed species-level lineages or reflect uncharacterized aspects of nrDNA evolution in the R. melanophthalma species complex.
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Affiliation(s)
- Michael Bradshaw
- Department of Biology, Brigham Young University, 4102 Life Science Building, Provo, UT, 84602, USA
| | - Felix Grewe
- Grainger Bioinformatics Center, The Field Museum, Chicago, IL, USA
| | - Anne Thomas
- Department of Biology, Brigham Young University, 4102 Life Science Building, Provo, UT, 84602, USA
| | - Cody H Harrison
- Department of Biology, Brigham Young University, 4102 Life Science Building, Provo, UT, 84602, USA
| | | | - Lucia Muggia
- Department of Life Sciences, University of Trieste, via Giorgieri 10, 34127, Trieste, Italy
| | - Larry L St Clair
- Department of Biology, Brigham Young University, 4102 Life Science Building, Provo, UT, 84602, USA.,M. L. Bean Life Science Museum, Brigham Young University, 4102 Life Science Building, Provo, UT, 84602, USA
| | | | - Steven D Leavitt
- Department of Biology, Brigham Young University, 4102 Life Science Building, Provo, UT, 84602, USA. .,M. L. Bean Life Science Museum, Brigham Young University, 4102 Life Science Building, Provo, UT, 84602, USA.
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Zakeri Z, Otte V, Sipman H, Malíček J, Cubas P, Rico VJ, Lenzová V, Svoboda D, Divakar PK. Discovering cryptic species in the Aspiciliella intermutans complex (Megasporaceae, Ascomycota) - First results using gene concatenation and coalescent-based species tree approaches. PLoS One 2019; 14:e0216675. [PMID: 31136587 PMCID: PMC6538240 DOI: 10.1371/journal.pone.0216675] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Accepted: 04/26/2019] [Indexed: 11/20/2022] Open
Abstract
Taxonomic identifications in some groups of lichen-forming fungi have been challenge largely due to the scarcity of taxonomically relevant features and limitations of morphological and chemical characters traditionally used to distinguish closely related taxa. Delineating species boundaries in closely related species or species complexes often requires a range of multisource data sets and comprehensive analytical methods. Here we aim to examine species boundaries in a group of saxicolous lichen forming fungi, the Aspiciliella intermutans complex (Megasporaceae), widespread mainly in the Mediterranean. We gathered DNA sequences of the nuclear ribosomal internal transcribed spacer (nuITS), the nuclear large subunit (nuLSU), the mitochondrial small subunit (mtSSU) ribosomal DNA, and the DNA replication licensing factor MCM7 from 80 samples mostly from Iran, Caucasia, Greece and eastern Europe. We used a combination of phylogenetic strategies and a variety of empirical, sequence-based species delimitation approaches to infer species boundaries in this group. The latter included: the automatic barcode gap discovery (ABGD), the multispecies coalescent approach *BEAST and Bayesian Phylogenetics and Phylogeography (BPP) program. Different species delimitation scenarios were compared using Bayes factors species delimitation analysis. Furthermore, morphological, chemical, ecological and geographical features of the sampled specimens were examined. Our study uncovered cryptic species diversity in A. intermutans and showed that morphology-based taxonomy may be unreliable, underestimating species diversity in this group of lichens. We identified a total of six species-level lineages in the A. intermutans complex using inferences from multiple empirical operational criteria. We found little corroboration between morphological and ecological features with our proposed candidate species, while secondary metabolite data do not corroborate tree topology. The present study on the A. intermutans species-complex indicates that the genus Aspiciliella, as currently circumscribed, is more diverse in Eurasia than previously expected.
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Affiliation(s)
- Zakieh Zakeri
- Senckenberg Museum of Natural History, Görlitz, Germany
- * E-mail:
| | - Volker Otte
- Senckenberg Museum of Natural History, Görlitz, Germany
| | - Harrie Sipman
- Botanischer Garten & Botanisches Museum Berlin-Dahlem, Berlin, Germany
| | - Jiří Malíček
- The Czech Academy of Sciences, Institute of Botany, Průhonice, Czech Republic
| | - Paloma Cubas
- Departamento de Farmacología, Farmacognosia y Botánica (U.D. Botánica), Facultad de Farmacia, Universidad Complutense, Madrid, Spain
| | - Víctor J. Rico
- Departamento de Farmacología, Farmacognosia y Botánica (U.D. Botánica), Facultad de Farmacia, Universidad Complutense, Madrid, Spain
| | - Veronika Lenzová
- Charles University in Prague, Faculty of Sciences, Department of Botany, Prague, Czech Republic
| | - David Svoboda
- Charles University in Prague, Faculty of Sciences, Department of Botany, Prague, Czech Republic
| | - Pradeep K. Divakar
- Departamento de Farmacología, Farmacognosia y Botánica (U.D. Botánica), Facultad de Farmacia, Universidad Complutense, Madrid, Spain
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Rogers SO. Integrated evolution of ribosomal RNAs, introns, and intron nurseries. Genetica 2018; 147:103-119. [PMID: 30578455 DOI: 10.1007/s10709-018-0050-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2018] [Accepted: 12/13/2018] [Indexed: 12/21/2022]
Abstract
The initial components of ribosomes first appeared more than 3.8 billion years ago during a time when many types of RNAs were evolving. While modern ribosomes are complex molecular machines consisting of rRNAs and proteins, they were assembled during early evolution by the association and joining of small functional RNA units. Introns may have provided the means to ligate many of these pieces together. All four classes of introns (group I, group II, spliceosomal, and archaeal) are present in many rRNA gene loci over a broad phylogenetic range. A survey of rRNA intron sequences across the three major life domains suggests that some of the classes of introns may have diverged from one another within rRNA gene loci. Analyses of rRNA sequences revealed self-splicing group I and group II introns are present in ancestral regions of the SSU (small subunit) and LSU (large subunit), whereas spliceosomal and archaeal introns appeared in sections of the rRNA that evolved later. Most classes of introns increased in number for approximately 1 billion years. However, their frequencies are low in the most recently evolved regions added to the SSU and LSU rRNAs. Furthermore, many of the introns appear to have been in the same locations for billions of years, suggesting an ancient origin for these sequences. In this Perspectives paper, I reviewed and analyzed rRNA intron sequences, locations, structural characteristics, and splicing mechanisms; and suggest that rRNA gene loci may have served as evolutionary nurseries for intron formation and diversification.
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Affiliation(s)
- Scott O Rogers
- Department of Biological Sciences, Bowling Green State University, Bowling Green, OH, 43403, USA.
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Molina MC, Divakar PK, Goward T, Millanes AM, Lumbsch HT, Crespo A. Neogene diversification in the temperate lichen-forming fungal genus Parmelia (Parmeliaceae, Ascomycota). SYST BIODIVERS 2016. [DOI: 10.1080/14772000.2016.1226977] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- M. Carmen Molina
- Departamento de Biología y Geología, Física y Química Inorgánica (Área de Biodiversidad y Conservación), ESCET, Universidad Rey Juan Carlos, Móstoles, 28933 Madrid, Spain
| | - Pradeep K. Divakar
- Departamento de Biología Vegetal II, Facultad de Farmacia, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - Trevor Goward
- UBC Herbarium, Beaty Museum, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - Ana M. Millanes
- Departamento de Biología y Geología, Física y Química Inorgánica (Área de Biodiversidad y Conservación), ESCET, Universidad Rey Juan Carlos, Móstoles, 28933 Madrid, Spain
| | | | - Ana Crespo
- Departamento de Biología Vegetal II, Facultad de Farmacia, Universidad Complutense de Madrid, 28040 Madrid, Spain
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Nyati S, Bhattacharya D, Werth S, Honegger R. Phylogenetic analysis of LSU and SSU rDNA group I introns of lichen photobionts associated with the genera Xanthoria and Xanthomendoza (Teloschistaceae, lichenized Ascomycetes). JOURNAL OF PHYCOLOGY 2013; 49:10.1111/jpy.12126. [PMID: 24415800 PMCID: PMC3885279 DOI: 10.1111/jpy.12126] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
We studied group I introns in sterile cultures of selected groups of lichen photobionts, focusing on Trebouxia species associated with Xanthoria s. lat. (including Xanthomendoza spp.; lichen-forming ascomycetes). Group I introns were found inserted after position 798 (Escherichia coli numbering) in the large subunit (LSU) rRNA in representatives of the green algal genera Trebouxia and Asterochloris. The 798 intron was found in about 25% of Xanthoria photobionts including several reference strains obtained from algal culture collections. An alignment of LSU-encoded rDNA intron sequences revealed high similarity of these sequences allowing their phylogenetic analysis. The 798 group I intron phylogeny was largely congruent with a phylogeny of the Internal Transcribed Spacer Region (ITS), indicating that the insertion of the intron most likely occurred in the common ancestor of the genera Trebouxia and Asterochloris. The intron was vertically inherited in some taxa, but lost in others. The high sequence similarity of this intron to one found in Chlorella angustoellipsoidea suggests that the 798 intron was either present in the common ancestor of Trebouxiophyceae, or that its present distribution results from more recent horizontal transfers, followed by vertical inheritance and loss. Analysis of another group I intron shared by these photobionts at small subunit (SSU) position 1512 supports the hypothesis of repeated lateral transfers of this intron among some taxa, but loss among others. Our data confirm that the history of group I introns is characterized by repeated horizontal transfers, and suggests that some of these introns have ancient origins within Chlorophyta.
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Affiliation(s)
- Shyam Nyati
- Author for correspondence: phone: +1 734 763 0921 fax: +1 734 763 5447
| | - Debashish Bhattacharya
- Department of Ecology, Evolution and Natural Resources and Institute of Marine and Coastal Science, Rutgers University, 59 Dudley Road, New Brunswick, New Jersey 08901, USA
| | - Silke Werth
- Faculty of Life- and Environmental Sciences, University of Iceland, Sturlugata 7, 101 Reykjavík, Iceland
| | - Rosmarie Honegger
- Institute of Plant Biology, University of Zurich, Zollikerstrasse 107, 8008 Zurich, Switzerland
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Leavitt S, Fernández-Mendoza F, Pérez-Ortega S, Sohrabi M, Divakar P, Lumbsch T, St. Clair L. DNA barcode identification of lichen-forming fungal species in the Rhizoplaca melanophthalma species-complex (Lecanorales, Lecanoraceae), including five new species. MycoKeys 2013. [DOI: 10.3897/mycokeys.7.4508] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
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Hafez M, Iranpour M, Mullineux ST, Sethuraman J, Wosnitza KM, Lehn P, Kroeker J, Loewen PC, Reid J, Hausner G. Identification of group I introns within the SSU rDNA gene in species of Ceratocystiopsis and related taxa. Fungal Biol 2012; 116:98-111. [DOI: 10.1016/j.funbio.2011.10.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2011] [Revised: 10/17/2011] [Accepted: 10/18/2011] [Indexed: 11/28/2022]
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Another example of cryptic diversity in lichen-forming fungi: the new species Parmelia mayi (Ascomycota: Parmeliaceae). ORG DIVERS EVOL 2011. [DOI: 10.1007/s13127-011-0060-4] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Leavitt SD, Johnson LA, Goward T, St. Clair LL. Species delimitation in taxonomically difficult lichen-forming fungi: An example from morphologically and chemically diverse Xanthoparmelia (Parmeliaceae) in North America. Mol Phylogenet Evol 2011; 60:317-32. [DOI: 10.1016/j.ympev.2011.05.012] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2010] [Revised: 05/13/2011] [Accepted: 05/16/2011] [Indexed: 01/03/2023]
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Complex patterns of speciation in cosmopolitan “rock posy” lichens – Discovering and delimiting cryptic fungal species in the lichen-forming Rhizoplaca melanophthalma species-complex (Lecanoraceae, Ascomycota). Mol Phylogenet Evol 2011; 59:587-602. [DOI: 10.1016/j.ympev.2011.03.020] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2010] [Revised: 12/16/2010] [Accepted: 03/17/2011] [Indexed: 11/19/2022]
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Construction and characterization of a full-length cDNA library from mycobiont of Endocarpon pusillum (lichen-forming Ascomycota). World J Microbiol Biotechnol 2011. [DOI: 10.1007/s11274-011-0768-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Leavitt SD, Johnson L, St Clair LL. Species delimitation and evolution in morphologically and chemically diverse communities of the lichen-forming genus Xanthoparmelia (Parmeliaceae, Ascomycota) in western North America. AMERICAN JOURNAL OF BOTANY 2011; 98:175-188. [PMID: 21613107 DOI: 10.3732/ajb.1000230] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
PREMISE OF THE STUDY Accurate species delimitation is important for understanding the diversification of biota and has critical implications for ecological and conservation studies. However, a growing body of evidence indicates that morphology-based species circumspection in lichenized fungi misrepresents fungal diversity. The foliose lichen genus Xanthoparmelia includes over 800 species displaying a complex array of morphological and secondary metabolite diversity. METHODS We used a multifaceted approach, applying phylogenetic, population genetic, and genealogical analyses to delimit species in a single well-supported monophyletic clade containing 10 morphologically and chemically diverse Xanthoparmelia species in western North America. Sequence data from four ribosomal and two low-copy, protein-coding markers, along with chemical and morphological data were used to assess species diversity. KEY RESULTS We found that traditionally circumscribed species are not supported by molecular data. Rather, all sampled taxa were better represented by three polymorphic population clusters. Our results suggest that secondary metabolite variation may have limited utility in diagnosing lineages within this group, while identified populations clusters did not reflect major phylogeographic or ecological patterns. CONCLUSIONS In contrast to studies revealing previously undiscovered fungal lineages masked within lichen species circumscribed by traditional morphological and chemical concepts, the present study suggests that species diversity has been overestimated in the species-rich genus Xanthoparmelia.
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Affiliation(s)
- Steven D Leavitt
- Department of Biology and the M. L. Bean Life Science Museum, 401 WIDB, Brigham Young University, Provo, Utah 84602, USA.
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Crespo A, Ferencova Z, Pérez-Ortega S, Elix JA, Divakar PK. Austroparmelina, a new Australasian lineage in parmelioid lichens (Parmeliaceae, Ascomycota). SYST BIODIVERS 2010. [DOI: 10.1080/14772001003738320] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Divakar PK, Lumbsch HT, Ferencova Z, Del Prado R, Crespo A. Remototrachyna, a newly recognized tropical lineage of lichens in the Hypotrachyna clade (Parmeliaceae, Ascomycota), originated in the Indian subcontinent. AMERICAN JOURNAL OF BOTANY 2010; 97:579-590. [PMID: 21622420 DOI: 10.3732/ajb.0900140] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Biogeographical studies of lichens used to be complicated because of the large distribution ranges of many species. Molecular systematics has revitalized lichen biogeography by improving species delimitation and providing better information about species range limitations. This study focuses on the major clade of tropical parmelioid lichens, which share a chemical feature, the presence of isolichenan in the cell wall, and a morphological feature, microscopic pores in the uppermost layer. Our previous phylogenetic studies revealed that the largest genus in this clade, Hypotrachyna, is polyphyletic with a clade mainly distributed in South and East Asia clustering distant from the core of the genus. To divide the Hypotrachyna clade into monophyletic groups and to reevaluate morphological and chemical characters in a phylogenetic context, we sampled ITS, nuclear large subunit (nuLSU) and mitochondrial small subunit (mtSSU) rDNA sequences from 77 species. We are erecting the new genus Remototrachyna for a core group of 15 former Hypotrachyna species. The segregation of Remototrachyna from Hypotrachyna receives support from morphological and chemical data, as well from maximum parsimony, maximum likelihood, and Bayesian phylogenetic analyses of the DNA. We used a likelihood approach to study the geographic range evolution of Remototrachyna and Bulbothrix, which are sister groups. This analysis suggests that the ancestral range of Remototrachyna was restricted to India and that subsequent long-distance dispersal is responsible for the pantropical occurrence of two species of Remototrachyna.
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Affiliation(s)
- Pradeep K Divakar
- Departamento de Biología Vegetal II, Facultad de Farmacia, Universidad Complutense de Madrid, Madrid 28040 Spain
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Suitability of chloroplast LSU rDNA and its diverse group I introns for species recognition and phylogenetic analyses of lichen-forming Trebouxia algae. Mol Phylogenet Evol 2010; 54:437-44. [DOI: 10.1016/j.ympev.2009.10.024] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2009] [Revised: 10/06/2009] [Accepted: 10/18/2009] [Indexed: 11/23/2022]
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Harris L, Rogers SO. Splicing and evolution of an unusually small group I intron. Curr Genet 2008; 54:213-22. [PMID: 18777024 DOI: 10.1007/s00294-008-0213-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2008] [Revised: 08/14/2008] [Accepted: 08/20/2008] [Indexed: 10/21/2022]
Abstract
Introns are common in the rRNA gene loci of fungal genomes, but biochemical studies to investigate splicing are rare. Here, self-splicing of a very small (67 nucleotide) group I intron is demonstrated. The PaSSU intron (located within the rRNA small subunit gene of Phialophora americana) splices in vitro under group I intron conditions. Most group I ribozymes contain pairing regions P1-P10, with a conserved G.U pair at the 5' splice site, and a G at the 3' intron border. The PaSSU intron contains only P1, P7, and P10. While it contains the G.U pair at the 5' splice, a U is found at the 3' end of the intron instead of a G. Phylogenetic analysis places it within subgroup IC1, whose members are found in the nuclear rRNA genes of fungi. The structural elements are similar to those in the centermost regions of other group I introns. Its size can be explained by a single large deletion that removed P2 through much of P9. Part of the original P9 region has assumed the function of P7. Its small size and genealogy makes it an excellent model to study RNA catalysis and evolution.
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Affiliation(s)
- Lorena Harris
- Department of Biological Sciences, Bowling Green State University, Bowling Green, OH 43403, USA
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