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C Swimmer M G Fenerjian J C Martínez-Cruzado F C Kafatos 《Journal of molecular biology》1990,215(2):225-235
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Pawlitzky I Angeles CV Siegel AM Stanton ML Riblet R Brodeur PH 《Journal of immunology (Baltimore, Md. : 1950)》2006,176(11):6839-6851
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Position independent expression and developmental regulation is directed by the beta myosin heavy chain gene's 5' upstream region in transgenic mice. 总被引:2,自引:0,他引:2 下载免费PDF全文
Transgenic mice generated with constructs containing 5.6 kb of the beta myosin heavy chain (MyHC) gene's 5' flanking region linked to the cat reporter gene express the transgene at high levels. In all 47 lines analyzed, tissue-specific accumulation of chloramphenicol acetyltransferase was found at levels proportional to the number of integrated transgene copies. Deletion constructs containing only 0.6 kb of 5' upstream region showed position effects in transgenic mice and did not demonstrate copy number dependence although transgene expression remained muscle-specific. The 5.6 kb 5' upstream region conferred appropriate developmental control of the transgene to the cardiac compartment and directs copy number dependent and position independent expression. Lines generated with a construct in which three proximal cis-acting elements were mutated showed reduced levels of transgene expression, but all maintained their position independence and copy number dependence, suggesting the presence of distinct regulatory mechanisms. 相似文献