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An illustration of an insertion at chromosome level. In genetics, an insertion (also called an insertion mutation) is the addition of one or more nucleotide base pairs into a DNA sequence. This can often happen in microsatellite regions due to the DNA polymerase slipping. Insertions can be anywhere in size from one base pair incorrectly ...
This expands the replication region with newly inserted nucleotides. The template and the daughter strand can no longer pair correctly. [4] Nucleotide excision repair proteins are mobilized to this area where one likely outcome is the expansion of nucleotides in the template strand while the other is the absence of nucleotides.
Proflavin causes mutations by inserting itself between DNA bases, typically resulting in insertion or deletion of a single base pair. [2] Through the use of proflavin, the experimenters were able to insert or delete base pairs into their sequence of interest. When nucleotides were inserted or deleted, the gene would often be nonfunctional.
Hypertrophic cardiomyopathy is the most common cause of sudden death in young people, including trained athletes, and is caused by mutations in genes encoding proteins of the cardiac sarcomere. Mutations in the Troponin C gene are a rare genetic cause of hypertrophic cardiomyopathy. A recent study has indicated that a frameshift mutation (c ...
The two genes that exist after a gene duplication event are called paralogs and usually code for proteins with a similar function and/or structure. By contrast, orthologous genes present in different species which are each originally derived from the same ancestral sequence.
The breakpoints of inversions often happen in regions of repetitive nucleotides, and the regions may be reused in other inversions. [1] Chromosomal segments in inversions can be as small as 1 kilobases or as large as 100 megabases. [2] The number of genes captured by an inversion can range from a handful of genes to hundreds of genes. [3]
Ligation is the joining of two nucleotides, or two nucleic acid fragments, into a single polymeric chain through the action of an enzyme known as a ligase. The reaction involves the formation of a phosphodiester bond between the 3'-hydroxyl terminus of one nucleotide and the 5'-phosphoryl terminus of another nucleotide, which results in the two ...
This arrangement of two nucleotides binding together across the double helix (from six-carbon ring to six-carbon ring) is called a Watson-Crick base pair. DNA with high GC-content is more stable than DNA with low GC-content. A Hoogsteen base pair (hydrogen bonding the 6-carbon ring to the 5-carbon ring) is a rare variation of base-pairing. [26]