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Circular Ribosomal RNA Genes Are a General Feature of Schizopyrenid Amoebae
Author(s) -
CLARK C. GRAHAM,
CROSS GEORGE A. M.
Publication year - 1988
Publication title -
the journal of protozoology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.067
H-Index - 77
eISSN - 1550-7408
pISSN - 0022-3921
DOI - 10.1111/j.1550-7408.1988.tb04352.x
Subject(s) - naegleria , plasmid , biology , ribosomal rna , gene , flagellate , genetics , strain (injury) , rna , 18s ribosomal rna , protozoa , botany , anatomy
We have recently shown that the ribosomal RNA genes of the amoebo‐flagellate Naegleria gruberi Schardinger, 1899, strain NEG‐M are carried exclusively on a 14 kilobasepair plasmid. To explore the distribution of this unique gene arrangement, we have examined another strain of N. gruberi and four other species from the order Schizopyrenida. All have this unusual gene arrangement although the size of the plasmid varies widely. Species groups based on morphological criteria do not agree with those resulting from comparison of plasmid restriction enzyme patterns.