Molecular and General Genetics MGG

, Volume 228, Issue 1–2, pp 201–208 | Cite as

The transposable element Tam1 from Antirrhinum majus shows structural homology to the maize transposon En/Spm and has no sequence specificity of insertion

  • Wolfgang K. F. Nacken
  • Ralf Piotrowiak
  • Heinz Saedler
  • Hans Sommer


We present the genomic structure of Tam1, a transposable element from Antirrhinum majus. The Taml element is 15.2 kb long and includes two genes that are transcribed to produce a 2.4 kb (tnpl) and a 5 kb mRNA (tnp2). These transcripts partially overlap and the exons are scattered over the whole element. Tnp1 encodes a 53 kDa protein as deduced from the cDNA sequence. The 5 kb transcript of tnp2 contains an open reading frame that shares 45% homology with part of the tnpD gene of En/Spm from maize and 48% homology with an open reading frame of the Tgm element from Glycine max. We discuss the possible functions of these genes by analogy with En/Spm. Additionally, a number of flanking sequences of Taml insertions were analysed to investigate the sequence specificity of insertion. From these studies we conclude that Taml transposes predominantly into AT-rich regions that can be unique as well as repetitive. No specific target sequence of insertion could be found.

Key words

Antirrhinum majus Plant transposable element Taml structure Specificity of insertion 


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Copyright information

© Springer-Verlag 1991

Authors and Affiliations

  • Wolfgang K. F. Nacken
    • 1
  • Ralf Piotrowiak
    • 1
  • Heinz Saedler
    • 1
  • Hans Sommer
    • 1
  1. 1.Max-Planck-Institut für ZüchtigungsforschungKöln 30Germany

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