title: A 1.3 kb promoter fragment confers spatial and temporal expression of utrophin A mRNA in mouse skeletal muscle fibers.
abstract: Upregulation of utrophin in muscle is currently being examined as a potential therapy for Duchenne muscular dystrophy patients. In this context, we generated transgenic mice harboring a 1.3 kb human utrophin A promoter fragment driving expression of the lacZ gene. Characterization of reporter expression during postnatal muscle development revealed that the levels and localization of beta-galactosidase parallel expression of utrophin A transcripts. Moreover, we noted that the utrophin A promoter is more active in slow soleus muscles. Additionally, expression of the reporter gene was regulated during muscle regeneration in a manner similar to utrophin A transcripts. Together, these results show that the utrophin A promoter-lacZ construct mirrors expression of utrophin A mRNAs indicating that this utrophin A promoter fragment confers temporal and spatial patterns of expression in skeletal muscle. This transgenic mouse will be valuable as an in vivo model for developing and testing molecules aimed at increasing utrophin A expression.
authors.affiliation: Department of Cellular and Molecular Medicine and Centre for Neuromuscular Disease, Faculty of Medicine, University of Ottawa, 451 Smyth Road, Ottawa, Ont., Canada K1H 8M5.
authors.forename: Mark A
authors.initials: MA
authors.lastname: Stocksley
authors.forename: Joe V
authors.initials: JV
authors.lastname: Chakkalakal
authors.forename: Amanda
authors.initials: A
authors.lastname: Bradford
authors.forename: Pedro
authors.initials: P
authors.lastname: Miura
authors.forename: Yves
authors.initials: Y
authors.lastname: De Repentigny
authors.forename: Rashmi
authors.initials: R
authors.lastname: Kothary
authors.forename: Bernard J
authors.initials: BJ
authors.lastname: Jasmin
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D005260:Female; D015870:Gene Expression; D017930:Genes, Reporter; D015316:Genetic Therapy; D007763:Lac Operon; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D018656:Muscle Fibers, Fast-Twitch / Q000502:physiology; D018657:Muscle Fibers, Slow-Twitch / Q000502:physiology; D018482:Muscle, Skeletal / Q000166:cytology / Q000502:physiology*; D020388:Muscular Dystrophy, Duchenne / Q000503:physiopathology* / Q000628:therapy*; D009469:Neuromuscular Junction / Q000502:physiology; D011401:Promoter Regions, Genetic / Q000235:genetics; D012333:RNA, Messenger / Q000032:analysis; D012038:Regeneration / Q000502:physiology; D049411:Utrophin / Q000235:genetics*
chemical_list: D012333:RNA, Messenger; C483600:Utrn protein, mouse; D049411:Utrophin