Fungal systems, in particular the budding and fission yeasts, have been important players in unravelling the basic structural and regulatory elements involved in a wide array of cellular processes.
They identified a 435 base pairs (bp) region with two distinct liver regulatory elements in the liver-basic fatty acid-binding protein (fabp10a) gene, which is sufficient to modulate liver regional expression in transgenic zebrafish [ 47].
BAC transgenesis has many important applications in basic and applied biomedical research, from the analysis of regulatory elements controlling gene expression to creating animal models of human diseases [ 1- 3].
The first (and more abundant) motif corresponds to (GAGA n putative regulatory elements, which are the binding site for BASIC PENTACYSTEINE1 (BPC1), a regulator of the homeotic Arabidopsis thaliana gene AGL11, which controls ovule identity [ 39].
Myc and Max form heterodimers via basic helix-loop-helix leucine zipper domains and bind to E-box regulatory elements in target genes.
However, the possible enrichment of regulatory elements in the first intron alone cannot explain the basic patterns in exon-intron variation as well as co-variation patterns between exons and introns.
Non-coding sequence elements conserved from Fugu to man might harbour enhancers directing a basic outline common to the two distantly related vertebrates, whereas tetrapod specific CNEs might only contain regulatory elements for later additions to the body plan, such as an autopod with digits.
USF is a ubiquitously expressed upstream stimulating factor and a member of the basic-Helix-Loop-Helix-Leucine Zipper transcription factor family with high affinity for cognate E-box regulatory elements.
With respect to basic research, transgenic manipulations offer the opportunity to carry out in vivo functional analysis of genes or to identify their cis regulatory elements.
But they also include basic regulatory standards.
