title: Microarray analysis of Tbx5-induced genes expressed in the developing heart.
abstract: Tbx5 is a member of the T-box family of transcription factors and is associated with Holt-Oram syndrome (HOS), a congenital disorder characterized by heart and limb defects. Although implicated in several processes during development, only a few genes regulated by Tbx5 have been reported. To identify candidate genes regulated by Tbx5 during heart development, a microarray approach was used. A cardiac-derived mouse cell line (1H) was infected with adenoviruses expressing Tbx5 or beta-galactosidase and RNA was isolated for analysis using an Affymetrix gene chip representing over 39,000 transcripts. Real-time reverse transcriptase-polymerase chain reaction confirmed Tbx5 induction of a subset of the genes, including nppa, photoreceptor cadherin, brain creatine kinase, hairy/enhancer-of-split related 2, and gelsolin. In situ hybridization analysis indicated overlapping expression of these genes with tbx5 in the embryonic mouse heart. In addition, the effect of HOS-associated mutations on the ability of Tbx5 to induce target gene expression was evaluated. Together, these data identify several genes induced by Tbx5 that are potentially important during cardiac development. These genes represent new candidate gene targets of Tbx5 that may be related to congenital heart malformations associated with HOS.
authors.affiliation: Division of Molecular Cardiovascular Biology, Cincinnati Children's Hospital Medical Center, ML7020, Cincinnati, Ohio, USA.
authors.forename: Timothy F
authors.initials: TF
authors.lastname: Plageman
authors.forename: Katherine E
authors.initials: KE
authors.lastname: Yutzey
mesh_terms: D000256:Adenoviridae / Q000235:genetics; D000818:Animals; D009320:Atrial Natriuretic Factor; D051792:Basic Helix-Loop-Helix Proteins / Q000235:genetics / Q000378:metabolism; D015153:Blotting, Western; D002460:Cell Line; D018260:Gelsolin / Q000235:genetics / Q000378:metabolism; D020869:Gene Expression Profiling; D018507:Gene Expression Regulation, Developmental / Q000235:genetics; D005822:Genetic Vectors / Q000235:genetics; D006321:Heart / Q000196:embryology*; D017403:In Situ Hybridization; D051379:Mice; D009154:Mutation / Q000235:genetics; D009206:Myocardium / Q000166:cytology / Q000378:metabolism*; D020098:Natriuretic Peptide, C-Type / Q000235:genetics / Q000378:metabolism; D020411:Oligonucleotide Array Sequence Analysis / Q000379:methods*; D011498:Protein Precursors / Q000235:genetics / Q000378:metabolism; D012097:Repressor Proteins / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D020825:T-Box Domain Proteins / Q000235:genetics* / Q000502:physiology; D014162:Transfection
chemical_list: D009320:Atrial Natriuretic Factor; D051792:Basic Helix-Loop-Helix Proteins; D018260:Gelsolin; D020098:Natriuretic Peptide, C-Type; D011498:Protein Precursors; D012097:Repressor Proteins; D020825:T-Box Domain Proteins; C485778:Hey2 protein, mouse; C431578:Nppa protein, mouse; C103172:T-box transcription factor 5