title: Transcription factor hlh-2/E/Daughterless drives expression of α integrin ina-1 during DTC migration in C. elegans.
abstract: Integrins are involved in a vast number of cell behaviors due to their roles in adhesion and signaling. The regulation of integrin expression is of particular interest as a mechanism to drive developmental events and for the role of altered integrin expression profiles in cancer. Dynamic regulation of the expression of integrin receptors is required for the migration of the distal tip cell (DTC) during gonadogenesis in Caenorhabditis elegans. α integrin ina-1 is required for DTC motility, yet is up-regulated by an unknown mechanism. Analysis of the promoter for α integrin ina-1 identified two E-box sequences that are required for ina-1 expression in the DTC. Knockdown of transcription factor hlh-2, an established E-box binding partner and ortholog of E/Daughterless, prevented expression of a transcriptional fusion of the ina-1 promoter to RFP and blocked DTC migration. Similarly, knockdown of hlh-2 also prevented expression of a translational fusion of the genomic ina-1 gene to GFP while blocking DTC migration. Knockdown of HLH-2 binding partner MIG-24 also reduced ina-1 expression and DTC migration. Overall, these results show that the transcription factor hlh-2 is required for up-regulation of ina-1 at the onset of DTC migration.
authors.affiliation: Christopher Newport University, Newport News, VA 23606, USA. Electronic address: christopher.meighan@cnu.edu.
authors.forename: Christopher M
authors.initials: CM
authors.lastname: Meighan
authors.affiliation: Christopher Newport University, Newport News, VA 23606, USA. Electronic address: allison.kann.11@cnu.edu.
authors.forename: Allison P
authors.initials: AP
authors.lastname: Kann
authors.affiliation: Christopher Newport University, Newport News, VA 23606, USA. Electronic address: emily.egress.13@cnu.edu.
authors.forename: Emily R
authors.initials: ER
authors.lastname: Egress
mesh_terms: D000818:Animals; D001483:Base Sequence; D051792:Basic Helix-Loop-Helix Proteins / Q000502:physiology*; D017173:Caenorhabditis elegans / Q000166:cytology / Q000254:growth & development / Q000378:metabolism*; D029742:Caenorhabditis elegans Proteins / Q000235:genetics* / Q000378:metabolism / Q000502:physiology*; D002465:Cell Movement; D018507:Gene Expression Regulation, Developmental; D016023:Integrins / Q000235:genetics* / Q000378:metabolism; D008969:Molecular Sequence Data; D038081:Organogenesis; D011401:Promoter Regions, Genetic; D014158:Transcription, Genetic
chemical_list: D051792:Basic Helix-Loop-Helix Proteins; D029742:Caenorhabditis elegans Proteins; D016023:Integrins; C106514:HLH-2 protein, C elegans; C521951:Ina-1 protein, C elegans
keywords: C. elegans; Cell migration; Gonadogenesis; Integrins; Transcription regulation; hlh-2; ina-1