Gene Regulation in Eukaryotes The latest estimates are that a human cell, a eukaryotic cell, contains some 21, 000 genes. Some of these are expressed in all cells all the time. These socalled housekeeping genes are responsible for the routine metabolic functions (e. g. respiration) common to all cells.Start studying Gene Expression and Regulation. Learn vocabulary, terms, and more with flashcards, games, and other study tools. promoter regulation gene expression
Regulation of gene expression, or gene regulation, includes a wide range of mechanisms that are used by cells to increase or decrease the production of specific gene products (protein or RNA). Sophisticated programs of gene expression are widely observed in biology, for example to trigger developmental pathways, respond to environmental stimuli, or adapt to new food sources.
Mar 15, 2010 The basal transcription factors, which act in conjunction with the core promoter, are another important component in the regulation of gene expression. For instance, upon differentiation of myoblasts to myotubes, the cells undergo a switch from a TFIIDbased transcription system to a TRF3TAF3based system. How can the answer be improved?promoter regulation gene expression The Promoter and the Transcription Machinery. Genes are organized to make the control of gene expression easier. The promoter region is immediately upstream of the coding sequence. This region can be short (only a few nucleotides in length) or quite long (hundreds of nucleotides long).
Jun 28, 2019 Two different genes may have the same promoter but different distal control elements, enabling differential gene expression. In addition to the general transcription factors, other transcription factors can bind to the promoter to regulate gene transcription. These transcription factors bind to the promoters of a specific set of genes. promoter regulation gene expression Regulation of gene expression at the promoter level is mainly controlled by the cisacting elements localized upstream of the transcriptional start site Conserved eukaryotic promoter elements CAAT box: A consensus sequence close to 80 bp from the start point (1). P is the promoter for the lac genes, and PI is the promoter for the I gene. O 1 is the main operator for the lac operon; O 2 and O 3 are secondary operator sites of lesser affinity for the Lac repressor.