title: Identification of presomitic mesoderm (PSM)-specific Mesp1 enhancer and generation of a PSM-specific Mesp1/Mesp2-null mouse using BAC-based rescue technology.
abstract: Bacterial artificial chromosome (BAC) modification technology is a powerful method for the identification of enhancer sequences and genetic modifications. Using this method, we have analyzed the Mesp1 and/or Mesp2 enhancers and identified P1-PSME, a PSM-specific enhancer of Mesp1, which contains a T-box binding site similar to the previously identified P2-PSME. Hence, Mesp1 and Mesp2 use different enhancers for their PSM-specific expression. In addition, we find that these two genes also use distinct enhancers for their early mesodermal expression. Based on these results, we generated a PSM-specific Mesp1/Mesp2-null mouse by introducing a BAC clone, from which only early mesodermal Mesp1 expression is possible, into the Mesp1/Mesp2 double knockout (dKO) genetic background. This successfully rescued gastrulation defects due to the lack of the early mesoderm in the dKO mouse and we thereby obtained a PSM-specific Mesp1/Mesp2-null mouse showing a lack of segmented somites.
authors.affiliation: Department of Genetics, SOKENDAI, Yata 1111, Mishima, Shizuoka 411-8540, Japan.
authors.forename: Masayuki
authors.initials: M
authors.lastname: Oginuma
authors.forename: Tatsumi
authors.initials: T
authors.lastname: Hirata
authors.forename: Yumiko
authors.initials: Y
authors.lastname: Saga
mesh_terms: D000818:Animals; D001483:Base Sequence; D051792:Basic Helix-Loop-Helix Proteins / Q000235:genetics* / Q000378:metabolism; D001665:Binding Sites; D022202:Chromosomes, Artificial, Bacterial; D004742:Enhancer Elements, Genetic; D018507:Gene Expression Regulation, Developmental; D008648:Mesoderm / Q000378:metabolism*; D051379:Mice; D018345:Mice, Knockout; D008969:Molecular Sequence Data; D010641:Phenotype; D011995:Recombination, Genetic; D012689:Sequence Homology, Nucleic Acid
chemical_list: D051792:Basic Helix-Loop-Helix Proteins; C101538:Mesp1 protein, mouse; C107407:Mesp2 protein, mouse