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Some housekeeping genes are transcribed at a relatively constant rate and these genes can be used as a reference point in experiments to measure the expression rates of other genes. A facultative gene is a gene only transcribed when needed as opposed to a constitutive gene.
The human genome contains on the order of 20,000 genes which work in concert to produce roughly 1,000,000 distinct proteins. This is due to alternative splicing, and also because cells make important changes to proteins through posttranslational modification after they first construct them, so a given gene serves as the basis for many possible versions of a particular protein.
The synthetic organism, Syn 3, has a minimal genome of 473 essential genes and quasi-essential genes (necessary for fast growth), although 149 have unknown function. [ 128 ] Essential genes include housekeeping genes (critical for basic cell functions) [ 135 ] as well as genes that are expressed at different times in the organisms development ...
If the genes of a gene family encode proteins, the term protein family is often used in an analogous manner to gene family. The expansion or contraction of gene families along a specific lineage can be due to chance, or can be the result of natural selection. [2] To distinguish between these two cases is often difficult in practice.
Structure of a gene regulatory network Control process of a gene regulatory network. A gene (or genetic) regulatory network (GRN) is a collection of molecular regulators that interact with each other and with other substances in the cell to govern the gene expression levels of mRNA and proteins which, in turn, determine the function of the cell.
Among other things, it identifies the locations of genes and all the coding regions in a genome and determines what those genes do. [ 4 ] Annotation is performed after a genome is sequenced and assembled , and is a necessary step in genome analysis before the sequence is deposited in a database and described in a published article.
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The genomic regions producing miRNA can be independent RNA-genes often being anti-sense to neighboring protein-coding genes, or can be found within the introns of protein-coding genes. [35] The co-localization of microRNA and protein-coding genes provides a mechanistic foundation by which microRNA regulates gene-expression.