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The cyanobacterial tRNA(Leu) (UAA) intron: Evolutionary patterns in a genetic marker
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för evolution, genomik och systematik, Fysiologisk botanik.
2002 (Engelska)Ingår i: Molecular Biology and Evolution, ISSN 0737-4038, Vol. 19, s. 850-857Artikel i tidskrift (Refereegranskat) Published
Ort, förlag, år, upplaga, sidor
2002. Vol. 19, s. 850-857
Identifikatorer
URN: urn:nbn:se:uu:diva-92111OAI: oai:DiVA.org:uu-92111DiVA, id: diva2:165072
Tillgänglig från: 2004-09-23 Skapad: 2004-09-23 Senast uppdaterad: 2012-08-22
Ingår i avhandling
1. The tRNALeu (UAA) Intron of Cyanobacteria: Towards Understanding a Genetic Marker
Öppna denna publikation i ny flik eller fönster >>The tRNALeu (UAA) Intron of Cyanobacteria: Towards Understanding a Genetic Marker
2004 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

The tRNALeu (UAA) intron has been recorded in the plastid genome of many algae and land plants and was the first intron to be discovered in cyanobacteria. In all known cases it interrupts the tRNALeu anticodon loop at a conserved position (U-intron-AA). Cyanobacteria are a diverse group of photosynthetic prokaryotes, some involved in symbiotic associations with a wide range of organisms. The most studied associations are those with plants, where strains of Nostoc are the common cyanobacterial partner. In this thesis two aspects of the biology of the cyanobacterial tRNALeu (UAA) intron are focused: first, the use of the intron as a genetic marker for studying the diversity and specificity of two cyanobacterial symbiosis (bryophytes and cycads) and second, the evolutionary patterns of the intron by using the unique data set generated from the diversity analysis.

From the studies, many different Nostoc strains are involved in the two symbiotic associations, although no variation was observed within a single bryophyte cavity or cycad coralloid root. Furthermore, a certain level of temporal stability in the cyanobiont composition of the bryophyte population was found and, in the cycad association different coralloid roots from a single specimen may harbor different cyanobacteria. That a minor cyanobiont could have avoided detection is still possible but unlikely. The sequence alignment of the Nostoc tRNALeu (UAA) introns reveals great sequence similarity with size variation only found in the structural element P6b. This element was found to consist of heptanucleotide repeats and of other non-repetitive genetic elements (NIS elements). The sporadic occurrence of the NIS elements indicates recent origins and a mechanism for its dispersal is proposed.

In this thesis new insights are given concerning cyanobacterial symbioses and also on the mechanisms involved in the evolution of an old genetic element: the tRNALeu (UAA) intron in cyanobacteria.

Ort, förlag, år, upplaga, sidor
Uppsala: Acta Universitatis Upsaliensis, 2004. s. 49
Serie
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 1009
Nyckelord
Biology, Biologi
Nationell ämneskategori
Biologiska vetenskaper
Identifikatorer
urn:nbn:se:uu:diva-4537 (URN)91-554-6033-X (ISBN)
Disputation
2004-10-15, Lecture Hall, room 3041, Department of Physiological Botany, Villavägen 6, Uppsala, 10:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2004-09-23 Skapad: 2004-09-23 Senast uppdaterad: 2009-04-02Bibliografiskt granskad

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