title: RHEB1 expression in embryonic and postnatal mouse.
abstract: Ras homolog enriched in brain (RHEB1) is a member within the superfamily of GTP-binding proteins encoded by the RAS oncogenes. RHEB1 is located at the crossroad of several important pathways including the insulin-signaling pathways and thus plays an important role in different physiological processes. To understand better the physiological relevance of RHEB1 protein, the expression pattern of RHEB1 was analyzed in both embryonic (at E3.5-E16.5) and adult (1-month old) mice. RHEB1 immunostaining and X-gal staining were used for wild-type and Rheb1 gene trap mutant mice, respectively. These independent methods revealed similar RHEB1 expression patterns during both embryonic and postnatal developments. Ubiquitous uniform RHEB1/β-gal and/or RHEB1 expression was seen in preimplantation embryos at E3.5 and postimplantation embryos up to E12.5. Between stages E13.5 and E16.5, RHEB1 expression levels became complex: In particular, strong expression was identified in neural tissues, including the neuroepithelial layer of the mesencephalon, telencephalon, and neural tube of CNS and dorsal root ganglia. In addition, strong expression was seen in certain peripheral tissues including heart, intestine, muscle, and urinary bladder. Postnatal mice have broad spatial RHEB1 expression in different regions of the cerebral cortex, subcortical regions (including hippocampus), olfactory bulb, medulla oblongata, and cerebellum (particularly in Purkinje cells). Significant RHEB1 expression was also viewed in internal organs including the heart, intestine, urinary bladder, and muscle. Moreover, adult animals have complex tissue- and organ-specific RHEB1 expression patterns with different intensities observed throughout postnatal development. Its expression level is in general comparable in CNS and other organs of mouse. Thus, the expression pattern of RHEB1 suggests that it likely plays a ubiquitous role in the development of the early embryo with more tissue-specific roles in later development.
authors.affiliation: OHSU Transgenic Mouse Models Shared Resource, Knight Cancer Institute, Oregon Health and Science University, 3181 SW Sam Jackson Park Road, Portland, OR, 97239, USA.
authors.forename: Qi
authors.initials: Q
authors.lastname: Tian
authors.affiliation: George Fox University, Newberg, OR, USA.
authors.forename: James L
authors.initials: JL
authors.lastname: Smart
authors.affiliation: Department of Hematology and Oncology, Jena University Hospital, 07747, Jena, Germany.
authors.forename: Joachim H
authors.initials: JH
authors.lastname: Clement
authors.affiliation: OHSU Transgenic Mouse Models Shared Resource, Knight Cancer Institute, Oregon Health and Science University, 3181 SW Sam Jackson Park Road, Portland, OR, 97239, USA.
authors.forename: Yingming
authors.initials: Y
authors.lastname: Wang
authors.affiliation: OHSU Transgenic Mouse Models Shared Resource, Knight Cancer Institute, Oregon Health and Science University, 3181 SW Sam Jackson Park Road, Portland, OR, 97239, USA.
authors.forename: Alex
authors.initials: A
authors.lastname: Derkatch
authors.affiliation: Friedrich-Schiller-University, 07740, Jena, Germany.
authors.forename: Harald
authors.initials: H
authors.lastname: Schubert
authors.affiliation: Department of Integrative Biosciences, Oregon Health and Science University, Portland, OR, USA.
authors.forename: Michael V
authors.initials: MV
authors.lastname: Danilchik
authors.affiliation: Department of Pediatrics, Oregon Health and Science University, Portland, OR, USA.
authors.forename: Daniel L
authors.initials: DL
authors.lastname: Marks
authors.affiliation: OHSU Transgenic Mouse Models Shared Resource, Knight Cancer Institute, Oregon Health and Science University, 3181 SW Sam Jackson Park Road, Portland, OR, 97239, USA. fedorovl@ohsu.edu.|Friedrich-Schiller-University, 07740, Jena, Germany. fedorovl@ohsu.edu.
authors.forename: Lev M
authors.initials: LM
authors.lastname: Fedorov
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D004622:Embryo, Mammalian / Q000378:metabolism*; D051379:Mice; D008810:Mice, Inbred C57BL; D020559:Monomeric GTP-Binding Proteins / Q000032:analysis* / Q000235:genetics / Q000378:metabolism*; D009474:Neurons / Q000378:metabolism*; D009928:Organ Specificity
chemical_list: D020559:Monomeric GTP-Binding Proteins
keywords: Adult mice; Embryos; Expression pattern; Gene trap; Immunohistochemistry; Rheb1 gene; X-gal staining