Molecular and General Genetics MGG

, Volume 246, Issue 1, pp 128–131

Twintrons are not unique to the Euglena chloroplast genome: structure and evolution of a plastome cpn60 gene from a cryptomonad


  • Uwe-G. Maier
    • Cell BiologyInstitute of Biology II
  • Stefan A. Rensing
    • Cell BiologyInstitute of Biology II
  • Gabor L. Igloi
    • Institute of Biology III
  • Martina Maerz
    • Cell BiologyInstitute of Biology II
Short Communication

DOI: 10.1007/BF00290141

Cite this article as:
Maier, U., Rensing, S.A., Igloi, G.L. et al. Molec. Gen. Genet. (1995) 246: 128. doi:10.1007/BF00290141


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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© Springer-Verlag 1995