A transformation booster sequence (TBS) from Petunia hybrida functions as an enhancer-blocking insulator in Arabidopsis thaliana.
Several matrix-attachment regions (MARs) from animals have been shown to block interactions between an enhancer and promoter when situated between the two. Since a similar function for plant MARs has not been discerned, we tested the Zea mays ADH1 5' MAR, Nicotiana tabacum Rb7 3' MAR and a transformation booster sequence (TBS) MAR from Petunia hybrida for their ability to impede enhancer-promoter interactions in Arabidopsis thaliana. Stable transgenic lines containing vectors in which one of the three MAR elements or a 4 kb control sequence were interposed between the cauliflower mosaic virus 35S enhancer and a flower-specific AGAMOUS second intron-derived promoter (AGIP)::beta-glucuronidase (GUS) fusion were assayed for GUS expression in vegetative tissues. We demonstrate that the TBS MAR element, but not the ADH1 or Rb7 MARs, is able to block interactions between the 35S enhancer and AGIP without compromising the function of either with elements from which they are not insulated.
USDA-ARS Appalachian Fruit Research Station, 2217 Wiltshire Road, Kearneysville, WV 25430, USA.
Jean-Michel
JM
Hily
Stacy D
SD
Singer
Yazhou
Y
Yang
Zongrang
Z
Liu
D017360:Arabidopsis / Q000235:genetics* / Q000378:metabolism; D018744:DNA, Plant / Q000235:genetics; D004742:Enhancer Elements, Genetic; D018506:Gene Expression Regulation, Plant; D017343:Genes, Plant; D017930:Genes, Reporter; D045170:Matrix Attachment Regions; D032306:Petunia / Q000235:genetics*; D030821:Plants, Genetically Modified / Q000235:genetics / Q000378:metabolism; D011401:Promoter Regions, Genetic; D014026:Nicotiana / Q000235:genetics; D014169:Transformation, Bacterial; D003313:Zea mays / Q000235:genetics
D018744:DNA, Plant