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© Artur Scherf
Scanning Electron Microscopy of Red Blood Cell infected by Plasmodium falciparum.
Publication : The EMBO journal

The 11-1 gene of Plasmodium falciparum codes for distinct fast evolving repeats

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in The EMBO journal - 01 Apr 1988

Scherf A, Hilbich C, Sieg K, Mattei D, Mercereau-Puijalon O, Müller-Hill B

Link to Pubmed [PMID] – 2841111

EMBO J. 1988 Apr;7(4):1129-37

The 11-1 gene of Plasmodium falciparum has been investigated by DNA sequence analysis. It begins at the 5′ end with a putative miniexon coding for a polypeptide which has the characteristics of a signal sequence. The miniexon is followed by a small intron. This again is followed by a large exon consisting of 9-, 18- and 27-bp repeats embedded in unique DNA. Specific antibodies isolated by affinity chromatography on a purified recombinant fusion protein expressing the three- and six-amino acid repeats were used to identify the product of the 11-1 gene. In exhibits size variations from 260 to 350 kd in different strains. Southern blot analysis with synthetic DNA as probe demonstrates that the 18-bp repeat is absent or drastically altered in two strains whereas the other repeats are present in all seven strains investigated. The unusual preference for G in the third position of some codons of the repeats but not in the unique sequences indicates rapid evolution of the repeats. Slippage during replication, unequal crossing over and selection are discussed as possible mechanisms leading rapidly to extreme diversity.