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MyoD, also known as myoblast determination protein 1, [5] is a protein in animals that plays a major role in regulating muscle differentiation.MyoD, which was discovered in the laboratory of Harold M. Weintraub, [6] belongs to a family of proteins known as myogenic regulatory factors (MRFs). [7]
An enhancer localized in a DNA region distant from the promoter of a gene can have a very large effect on gene expression, with some genes undergoing up to 100-fold increased expression due to an activated enhancer. [32] Enhancers are regions of the genome that are major gene-regulatory elements.
This region is known as the enhancer region. Studies have suggested that thyroid hormone (T3) controls Sox2 expression via the enhancer region. The expression of TRα1 (thyroid hormone receptor) is increased in proliferating and migrating neural stem cells.
Ultrabithorax (Ubx) is a homeobox gene found in insects, and is used in the regulation of patterning in morphogenesis. There are many possible products of this gene, which function as transcription factors. Ubx is used in the specification of serially homologous structures, and is used at many levels of developmental hierarchies.
Enhancers are DNA sequences found in 5′ flanking regions of eukaryotic genes that affect transcription. If a transcription factor binds to an enhancer in a 5′ flanking region, the DNA strand bends in a way that the transcription factor that is bound to the enhancer can also bind the promoter of a gene.
A typical enhancer(TE), as illustrated in the top panel of the Figure, is a several hundred base pair region of DNA [1] [2] that can bind transcription factors to sequence motifs on the enhancer. The typical enhancer can come in proximity to its target gene through a large chromosome loop.
Enhanceosomes are formed in special cases when these activators cooperatively bind together along the enhancer sequence to create a distinct three-dimensional structure. Each enhanceosome is unique towards its specific enhancer. This assembly is facilitated by energetically favorable protein: protein and protein: DNA interactions. Therefore ...
According to this model, the heterochromatin forces an altered chromatin conformation on the euchromatic region. Due to this, the transcriptional machinery cannot access the gene which leads to the inhibition of transcription. [5] In other words, the heterochromatin spreads and causes gene silencing by packaging the normally euchromatic region. [2]