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Characterization of histone H3/H4 gene region and phylogenetic affinity of Ichthyophthirius multifiliis based on H4 DNA sequence variation.

Abstract：

:We sequenced the amino-terminal third of the histone H3 and H4 genes and the intergenic region from Ichthyophthirius multifiliis. Fourteen recombinant clones of 646 bp were sequenced and the level of sequence variation detected among these clones was similar to that reported among closely related species of Tetrahymena and to levels of sequence variation detected within other ciliates. The intergenic region is 417 bp and approximately 92% AT rich, making it the longest and most AT-rich ciliate H3/H4 intergenic region yet identified. Similar to Tetrahymena, the intergenic region of Ichthyophthirius contains two CCAAT regions arranged in a complementary orientation. A neighbor-joining tree was constructed based on nucleotide sequence variation among H4 genes to evaluate evolutionary relationships within and among six classes of Ciliophora. The single shortest neighbor-joining tree depicted a sister-group relationship of Ichthyophthirius with taxa of Tetrahymenina, thereby supporting monophyly of Oligohymenophorea.

journal_name

Mol Phylogenet Evol

journal_title

Molecular phylogenetics and evolution

authors

Van Den Bussche RA,Hoofer SR,Drew CP,Ewing MS

doi

10.1006/mpev.1999.0700

keywords:

subject

Has Abstract

pub_date

2000-03-01 00:00:00

pages

461-8

issue

3

eissn

1055-7903

issn

1095-9513

pii

S1055-7903(99)90700-5

journal_volume

14

pub_type

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