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Mol Cell Biol. 1990 May; 10(5): 2096-2103

Differential regulation of the N-myc gene in transfected cells and transgenic mice.

Howard Hughes Medical Institute, New York, New York.

ABSTRACT

The N-myc gene is expressed specifically in the early developmental stages of numerous cell lineages. To assay for sequences that could potentially regulate N-myc expression, we transfected constructs that contained murine N-myc genomic sequences linked to a reporter gene and genomic clones that contained the complete human or murine N-myc genes into cell lines that either express or do not express the endogenous N-myc gene. Following either transient or stable transfection, the introduced N-myc sequences were expressed regardless of the expression status of the endogenous gene. In contrast, when the clones containing the complete human N-myc gene were introduced into the germline of transgenic mice, expression in some transgenic lines paralleled the tissue- and stage-specific expression of the endogenous murine gene. These findings demonstrate differences in the regulation of N-myc genes in recipient cells following in vitro versus in vivo introduction, suggesting that early developmental events may play a role in the regulation of N-myc expression.

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