Three different group I introns in the nuclear large subunit ribosomal DNA of the amoeboflagellate Naegleria.

Abstract:

:We have amplified the large subunit ribosomal DNA (LSUrDNA) of the 12 described Naegleria spp. and of 34 other Naegleria lineages that might be distinct species. Two strains yielded a product that is longer than 3 kb, which is the length of the LSUrDNA of all described Naegleria spp. Sequencing data revealed that the insert in one of these strains is a group I intron without an open reading frame (ORF), while the other strain contains two different group I introns, of which the second intron has an ORF of 175 amino acids. In the latter ORF there is a conserved His-Cys box, as in the homing endonucleases present in group I introns in the small subunit ribosomal DNA (SSUrDNA) of Naegleria spp. Although the group I introns in the LSUrDNA differ in sequence, they are more related to each other than they are to the group I introns in the SSUrDNA of Naegleria spp. The three group I introns in the LSUrDNA in Naegleria are at different locations and are probably acquired by horizontal transfer, contrary to the SSUrDNA group I introns in this genus which are of ancestral origin and are transmitted vertically.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

De Jonckheere JF,Brown S

doi

10.1093/nar/26.2.456

subject

Has Abstract

pub_date

1998-01-15 00:00:00

pages

456-61

issue

2

eissn

0305-1048

issn

1362-4962

pii

gkb144

journal_volume

26

pub_type

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