Lineage-specific regulation of the neural differentiation gene MASH1

Developmental Biology
S Verma-KurvariJ E Johnson

Abstract

Mash1 is a transcription factor required during embryogenesis for the development of multiple neural lineages. It is expressed in restricted domains at specific stages in the developing central and peripheral nervous systems and in the developing olfactory epithelium. We have investigated the regulation of Mash1 expression during embryogenesis using transgenic mice containing Mash1/lacZ reporter constructs. Cis-acting regulatory elements controlling Mash1 expression in the central nervous system are located within an 8-kb sequence upstream of the Mash1 coding region. This 8-kb sequence does not contain elements directing expression to the peripheral nervous system, olfactory epithelium, or retina. Sequences outside this 8 kb but within 36 kb of the Mash1 locus contain elements responsible for expression in the autonomic division of the peripheral nervous system. However, transgene expression in embryos containing the 36-kb sequence was never detected in the olfactory epithelium and retina. Thus, regulatory elements driving expression in these lineages may be at even greater distances from the Mash1 coding region. These data provide evidence for complex regulation of Mash1 expression in which multiple lineage-specific cis-acting...Continue Reading

Citations

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