GERBOD, D., V.P. EDGCOMB, C. NOEL, Štěpánka VAŇÁČOVÁ, R. WINTJENS, Jan TACHEZY, M.L. SOGIN and E. VISCOGLIOSI. Phylogenetic relationships of class II fumarase genes from trichomonad species. MOLECULAR BIOLOGY AND EVOLUTION. USA: OXFORD UNIV PRESS, 2001, vol. 18, No 8, p. 1574-1584. ISSN 0737-4038.
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Basic information
Original name Phylogenetic relationships of class II fumarase genes from trichomonad species.
Name in Czech Phylogenetic relationships of class II fumarase genes from trichomonad species.
Authors GERBOD, D. (250 France), V.P. EDGCOMB (826 United Kingdom of Great Britain and Northern Ireland), C. NOEL (250 France), Štěpánka VAŇÁČOVÁ (203 Czech Republic, guarantor), R. WINTJENS (56 Belgium), Jan TACHEZY (203 Czech Republic), M.L. SOGIN (840 United States of America) and E. VISCOGLIOSI (250 France).
Edition MOLECULAR BIOLOGY AND EVOLUTION, USA, OXFORD UNIV PRESS, 2001, 0737-4038.
Other information
Original language English
Type of outcome Article in a journal
Field of Study Genetics and molecular biology
Country of publisher United Kingdom of Great Britain and Northern Ireland
Confidentiality degree is not subject to a state or trade secret
Impact factor Impact factor: 5.357
RIV identification code RIV/00216224:14310/01:00036248
Organization unit Faculty of Science
UT WoS 000170275500017
Keywords (in Czech) Parabasalida; Trichomonads; phylogeny; fumarase
Keywords in English Parabasalida; Trichomonads; phylogeny; fumarase
Tags fumarase, Parabasalida, phylogeny, Trichomonads
Tags International impact, Reviewed
Changed by Changed by: prof. Mgr. Štěpánka Vaňáčová, Ph.D., učo 105562. Changed: 29/3/2010 16:19.
Abstract
Class II fumarase sequences were obtained by polymerase chain reaction from five trichomonad species. All residues known to be highly conserved in this enzyme were present. Nuclear run-on assays showed that one of the two genes identified in Tritrichomonas foetus was expressed, whereas no fumarase transcripts were detected in the related species Trichomonas vaginalis. These findings corroborate previous biochemical data. Fumarase genes were also expressed in Monocercomonas sp. and Tetratrichomonas gallinarum but not in Pentatrichomonas hominis, Trichomonas gallinae, Trichomonas tenax, and Trichomitus batrachorum under the culture conditions used. Molecular trees inferred by likelihood methods reveal that trichomonad sequences have no affinity to described class II fumarase genes from other eukaryotes. The absence of functional mitochondria in protists such as trichomonads suggests that they diverged from other eukaryotes prior to the alpha-proteobacterial symbiosis that led to mitochondria. Furthermore, they are basal to other eukaryotes in rRNA analyses. However, support for the early-branching status of trichomonads and other amitochondriate protists based on phylogenetic analyses of multiple data sets has been equivocal. Although the presence of hydrogenosomes suggests that trichomonads once had mitochondria, their class II iron-independent fumarase sequences differ markedly from those of other mitochondriate eukaryotes. All of the class II fumarase genes described from other eukaryotes are of apparent alpha-proteobacterial origin and hence a marker of mitochondrial evolution. In contrast, the class II fumarase from trichomonads emerges among other eubacterial homologs. This is intriguing evidence for an independent acquisition of these genes in trichomonads apart from the mitochondrial endosymbiosis event that gave rise to the form present in other eukaryotes. The ancestral trichomonad class II fumarase may represent a prokaryotic form that was replaced in other eukaryotes after the divergence of trichomonads with the movement of endosymbiont genes into the nucleus. Alternatively, it may have been acquired via a separate endosymbiotic event or lateral gene transfer.
Abstract (in Czech)
Class II fumarase sequences were obtained by polymerase chain reaction from five trichomonad species. All residues known to be highly conserved in this enzyme were present. Nuclear run-on assays showed that one of the two genes identified in Tritrichomonas foetus was expressed, whereas no fumarase transcripts were detected in the related species Trichomonas vaginalis. These findings corroborate previous biochemical data. Fumarase genes were also expressed in Monocercomonas sp. and Tetratrichomonas gallinarum but not in Pentatrichomonas hominis, Trichomonas gallinae, Trichomonas tenax, and Trichomitus batrachorum under the culture conditions used. Molecular trees inferred by likelihood methods reveal that trichomonad sequences have no affinity to described class II fumarase genes from other eukaryotes. The absence of functional mitochondria in protists such as trichomonads suggests that they diverged from other eukaryotes prior to the alpha-proteobacterial symbiosis that led to mitochondria. Furthermore, they are basal to other eukaryotes in rRNA analyses. However, support for the early-branching status of trichomonads and other amitochondriate protists based on phylogenetic analyses of multiple data sets has been equivocal. Although the presence of hydrogenosomes suggests that trichomonads once had mitochondria, their class II iron-independent fumarase sequences differ markedly from those of other mitochondriate eukaryotes. All of the class II fumarase genes described from other eukaryotes are of apparent alpha-proteobacterial origin and hence a marker of mitochondrial evolution. In contrast, the class II fumarase from trichomonads emerges among other eubacterial homologs. This is intriguing evidence for an independent acquisition of these genes in trichomonads apart from the mitochondrial endosymbiosis event that gave rise to the form present in other eukaryotes. The ancestral trichomonad class II fumarase may represent a prokaryotic form that was replaced in other eukaryotes after the divergence of trichomonads with the movement of endosymbiont genes into the nucleus. Alternatively, it may have been acquired via a separate endosymbiotic event or lateral gene transfer.
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