Papers by Micke Andersson
Journal of General Virology, 2003
Enteroviruses show a high degree of sequence variation both between and within serotypes due to t... more Enteroviruses show a high degree of sequence variation both between and within serotypes due to the lack of proofreading of the viral RNA-dependent RNA polymerase. In addition, recombination is known to occur not only within but also between different serotypes. We have previously shown that capsid coding sequences of coxsackievirus B4 (CVB4) cluster in several coexisting genotypes (intergenotypic nucleotide difference of 12 % or more) whereas a single lineage of echovirus 30 (EV30) has been prevailing and evolving throughout the last two decades. In the major capsid gene, VP1, clustering of both nucleotide and amino acid sequences correlates with serotype. We have now determined a 501 nucleotide sequence in the non-structural 3CD region of CVB4 and EV30 field strains. Phylogenetic analysis revealed that sequences of Human enterovirus B (HEV-B) were segregated in the 3CD region into three distinct clusters without the VP1-associated serotype/genotype correlation. One of the clusters comprised the E2 strain of CVB4, the EV30 prototype and five other CVB4 field strains whereas the other two clusters, in addition to CVB4 and EV30 strains, also included other HEV-B serotypes. We believe that intertypic recombination is the most likely explanation for the observed incongruence. Similarity analysis based on complete genomes of the CVB4 and EV30 prototypes and the CVB4 E2 strain revealed that a putative recombination spot was mapped within the 2B gene. The incongruence observed in the two genomic domains (P1 and P3) suggests a certain degree of independent evolution, which may be explained by interserotypic recombination within an enterovirus species. It is thus difficult to exclude recombination in the history of any given strain.
La investigación es un proceso de constante exploración y descubrimiento, se caracteriza por atri... more La investigación es un proceso de constante exploración y descubrimiento, se caracteriza por atributos como son el basarse en trabajos realizados por otros investigadores; entre las características de una investigación esta el hecho de que esta se puede repetir, se puede generalizar a otras instituciones, se basa en algún razonamiento lógico y esta vinculado a una teoría, se generan nuevas preguntas o es de naturaleza cíclica, es incremental y se debe emprender con el fin de mejorar a la sociedad, y permite generar información que facilite la toma de decisiones para atender necesidades o resolver problemas de toda índole. La investigación puede abordar temas relacionados con la violencia, el matrimonio, el trabajo, la enfermedad, el matrimonio, los medios de comunicación, las emociones humanas, la familia, procesos, el entorno.
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Papers by Micke Andersson