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Vol. 12, Issue 5, 749-759, May 2002

LETTER
Transcriptional Regulation of the Stem Cell Leukemia Gene (SCL) --- Comparative Analysis of Five Vertebrate SCL Loci

Berthold Göttgens,1,4,5 Linda M. Barton,1,4 Michael A. Chapman,1 Angus M. Sinclair,1 Bjarne Knudsen,2 Darren Grafham,3 James G.R. Gilbert,3 Jane Rogers,3 David R. Bentley,3 and Anthony R. Green1

1 Cambridge Institute for Medical Research, Cambridge University, Cambridge, CB2 2XY, United Kingdom; 2 Bioinformatics Research Center, University of Aarhus, DK-8000 Denmark; 3 The Wellcome Trust Sanger Institute, Cambridge, CB101SA United Kingdom

The stem cell leukemia (SCL) gene encodes a bHLH transcription factor with a pivotal role in hematopoiesis and vasculogenesis and a pattern of expression that is highly conserved between mammals and zebrafish. Here we report the isolation and characterization of the zebrafish SCL locus together with the identification of three neighboring genes, IER5, MAP17, and MUPP1. This region spans 68 kb and comprises the longest zebrafish genomic sequence currently available for comparison with mammalian, chicken, and pufferfish sequences. Our data show conserved synteny between zebrafish and mammalian SCL and MAP17 loci, thus suggesting the likely genomic domain necessary for the conserved pattern of SCL expression. Long-range comparative sequence analysis/phylogenetic footprinting was used to identify noncoding conserved sequences representing candidate transcriptional regulatory elements. The SCL promoter/enhancer, exon 1, and the poly(A) region were highly conserved, but no homology to other known mouse SCL enhancers was detected in the zebrafish sequence. A combined homology/structure analysis of the poly(A) region predicted consistent structural features, suggesting a conserved functional role in mRNA regulation. Analysis of the SCL promoter/enhancer revealed five motifs, which were conserved from zebrafish to mammals, and each of which is essential for the appropriate pattern or level of SCL transcription.

[The following individuals kindly provided reagents, samples, or unpublished information as indicated in the paper: N. Tanese.]

4 These authors contributed equally to this work.

5 Corresponding author.

12:749-759 ©2002 by Cold Spring Harbor Laboratory Press  ISSN 1088-9051/02 $5.00
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