Twintrons Are Not Unique to the Euglena Chloroplast Genome: Structure and Evolution of a Plastome Cpn60 Gene from a Cryptomonad

Overview

Journal Mol Gen Genet

Specialties Genetics
Molecular Biology

Date 1995 Jan 6

PMID 7823908

Citations 12

Authors

U G Maier

S A Rensing

G L Igloi

M Maerz

Affiliations

Soon will be listed here.

Abstract

Introns within introns (twintrons) are known only from the Euglena chloroplast genome. Twintrons are group II or III introns, into which another group II or III intron has been transposed. In this paper we describe a non-Euglena twintron structure within a plastid-encoded chaperone gene (cpn60) of the cryptomonad alga Pyrenomonas salina. In addition, the evolutionary relationships between members of the Cpn60 protein family are determined. Our findings permit the inclusion of cryptomonad plastomes in phylogenetic studies of intron evolution and present further evidence for the origin of modern plastids from a cyanobacterial ancestor.

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Evolutionary Dynamics of Cryptophyte Plastid Genomes.

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