title: Identification of marker genes for pars tuberalis morphogenesis in chick embryo: expression of Cytokine-like 1 and Gap junction protein alpha 5 in pars tuberalis.
abstract: The adenohypophysis is formed from the oral ectoderm and consists of the pars distalis (PD), pars intermedia, and pars tuberalis (PT). The mechanisms of PD development have been extensively studied, and the cellular differentiation of the PD is well understood. However, the morphogenesis and differentiation of the PT are still unclear, and the genes expressed during PT development remain largely unknown. We have explored genes specifically expressed in the PT during embryonic development and analyzed their spatiotemporal expression patterns. Microarray analysis of laser-captured PT and PD tissues obtained from chick embryos on embryonic day 10 (E10.0) has shown high expression of Cytokine-like 1 (CYTL1) and Gap junction protein alpha 5 (GJA5) genes in the PT. Detailed analysis of these spatiotemporal expression patterns during chick embryo development by in situ hybridization has revealed that CYTL1 mRNA first appears in the lateral head ectoderm and ventral head ectoderm at E1.5. The expression of CYTL1 moves into Rathke's pouch at E2.5 and is then localized in the PT primordium where it is continuously expressed until E12.0. GJA5 mRNA is transiently detected in the PT primordium from E6.0 to E12.0, whereas its expression is not detected in the PD during development. Thus, these genes might be involved in the regulation mechanisms of PT development and could be useful markers for PT development.
authors: Department of Biology, Graduate School of Natural Science and Technology, Okayama University, 3-1-1, Tsushimanaka, Kita-ku, Okayama, 700-8530, Japan. saizawa@okayama-u.ac.jp.
authors: Sayaka
authors: S
authors: Aizawa
authors: Area of Reguatory Biology, Division of Life Science, Graduate School of Science and Engineering, Saitama University, 255 Shimo-ohkubo, Sakuraku, Saitama, 338-8570, Japan.
authors: Yuriko
authors: Y
authors: Higaki
authors: Area of Reguatory Biology, Division of Life Science, Graduate School of Science and Engineering, Saitama University, 255 Shimo-ohkubo, Sakuraku, Saitama, 338-8570, Japan.
authors: Amrita
authors: A
authors: Dudaui
authors: Area of Reguatory Biology, Division of Life Science, Graduate School of Science and Engineering, Saitama University, 255 Shimo-ohkubo, Sakuraku, Saitama, 338-8570, Japan.
authors: Mai
authors: M
authors: Nagasaka
authors: Department of Biology, Graduate School of Natural Science and Technology, Okayama University, 3-1-1, Tsushimanaka, Kita-ku, Okayama, 700-8530, Japan.
authors: Sumio
authors: S
authors: Takahashi
authors: Area of Reguatory Biology, Division of Life Science, Graduate School of Science and Engineering, Saitama University, 255 Shimo-ohkubo, Sakuraku, Saitama, 338-8570, Japan.
authors: Ichiro
authors: I
authors: Sakata
authors: Area of Reguatory Biology, Division of Life Science, Graduate School of Science and Engineering, Saitama University, 255 Shimo-ohkubo, Sakuraku, Saitama, 338-8570, Japan.
authors: Takafumi
authors: T
authors: Sakai
mesh_terms: D000818:Animals; D015415:Biomarkers / Q000378:metabolism*; D002642:Chick Embryo; D017630:Connexins / Q000235:genetics* / Q000378:metabolism; D016207:Cytokines / Q000235:genetics* / Q000378:metabolism; D004475:Ectoderm / Q000196:embryology* / Q000378:metabolism*; D047108:Embryonic Development / Q000235:genetics; D018507:Gene Expression Regulation, Developmental; D056726:Genetic Association Studies; D009024:Morphogenesis / Q000235:genetics*; D020411:Oligonucleotide Array Sequence Analysis; D009928:Organ Specificity / Q000235:genetics; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D000097003:Gap Junction alpha-5 Protein
chemical_list: D015415:Biomarkers; D017630:Connexins; D016207:Cytokines; D012333:RNA, Messenger; D000097003:Gap Junction alpha-5 Protein
keywords: Chicken; Cytokine-like 1; Development; Gap junction protein alpha 5; Pars tuberalis