Heterogeneity of eel thyrotropin β mRNAs is due to a minisatellite in the 3' untranslated region of the gene

  • Pradet-Balade B
  • Salmon C
  • Hardy A
 et al. 
  • 2


    Mendeley users who have this article in their library.
  • 13


    Citations of this article.


The aim of this study was to determine the causes of the high heterogeneity, in the number and the length, of the thyrotropin (TSH) β mRNA in the European eel. Northern blot analysis showed that removal of the poly(A) tail did not affect this heterogeneity. PCR amplification on reverse-transcribed pituitary RNAs (RT) showed the main source of heterogeneity to be a highly variable region in the 3' untranslated region (UTR). PCR amplification of the 3' UTR from RTs and genomic DNAs demonstrated that the high variability reflected polymorphism within the eel TSH β gene. Isolation and sequencing of 3' UTR amplification fragments showed that the variable region comprised more or less exact repetitions of a 26-42-bp fragment. The number of repetitions varied from one allele to another. This variable region could be characterized as a minisatellite. In conclusion, instability of a minisatellite in the 3' UTR of the TSH β gene generated the multiple and widely differing TSH β mRNAs.

Author-supplied keywords

  • Alleles
  • Anguilla anguilla
  • DNA recombination
  • Repeated elements
  • Teleost gene

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document


  • B. Pradet-Balade

  • C. Salmon

  • A. Hardy

  • B. Quérat

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free