Trends in evolution of 5S rRNA of deuterostomes: bases and homogeneous clusters
Genet. mol. biol
; Genet. mol. biol;25(3): 285-292, Sept. 2002. ilus, tab, graf
Article
em En
| LILACS
| ID: lil-335768
Biblioteca responsável:
BR26.1
RESUMO
Evolution of metazoan 5S rRNA sequences was analyzed through base composition and types, location and frequency of clustered bases. Characters from sequences of protostomes did not show regular trends as compared with paleontology dating or organism complexity. Trends of increasing G and C, stronger in G clusters, and decreasing A and U, were detected in deuterostomes, in parallel with evolution of complexity. The multifunctional domain 71-104 was highlighted among conserved stretches. Clusters of C were typical of helices. Those of G were longer, extending from helices into loops or related to bulges, which is suggestive of functional significance. Deuterostomian trends were installed early in the lineage and reached full development in aquatic organisms, not increasing further after reptiles. It can be suggested that ribosomal RNA structures participated in deuterostomian high regulatory complexity, either specifically or as part of the widespread processes of chromosomal regionalization
Texto completo:
1
Coleções:
01-internacional
Base de dados:
LILACS
Assunto principal:
Parasitos
/
RNA Ribossômico
/
Sequência de Bases
/
Evolução Biológica
Idioma:
En
Revista:
Genet. mol. biol
Assunto da revista:
GENETICA
Ano de publicação:
2002
Tipo de documento:
Article
País de afiliação:
Brasil
País de publicação:
Brasil