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Neuronal differentiation is an intricate and a complex process which involves crosstalk among various signaling pathways, growth factors, transcription factors, and epigenetic modifiers. During different stages of neuronal development, there are various histone modifiers which drive the expression of lineage-specific genes. Polycomb group proteins are one of the histone modifiers that control transcriptional repression of specific genes in development, differentiation, and functionality of various tissues. Chromatin immunoprecipitation (ChIP) is a widely used technique to investigate the interaction of proteins and DNA; ChIP combined with quantitative real-time PCR (qPCR) gives a quantitative data about the occupancy of specific protein on a particular stretch of DNA, and this can help us investigate how a protein regulates expression of a specific gene. In this chapter, we describe a protocol for ChIP coupled to qPCR during early neuronal differentiation to identify the specific genomic targets regulated by components of Polycomb repressive complex 1.
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