Telomere Terminal Nucleotide
Telomere Terminal Nucleotide - Related Videos
02:41
Telomeres and Telomerase
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2020
In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section of DNA cannot be replicated in the same manner as the rest of the strand because there is no 3’ end to which the newly synthesized DNA can attach. This non-replicated fragment results in gradual loss of the chromosomal DNA during each cell duplication. Additionally, it can induce a DNA damage response by enzymes that recognize single-stranded DNA.
11:29
Modified Terminal Restriction Fragment Analysis for Quantifying Telomere Length Using In-gel Hybridization
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Cited by 10 •
2017
In this article, a detailed protocol for quantifying telomere length using a modified terminal restriction fragment analysis is discussed that provides fast and efficient direct measurement of telomere length. This technique can be applied to a variety of cell sources of DNA for quantifying telomere length.
15:25
Examination of the Telomere G-overhang Structure in Trypanosoma brucei
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Cited by 11 •
2011
Telomeres are essential for chromosome stability and the telomere G-overhang structure is essential for telomerase-mediated telomere maintenance. We have recently adopted two methods for detecting the telomere G-overhang structure in Trypanosoma brucei, which are native in-gel hybridization and ligation-mediated primer extension, which will be described.
12:08
Telomere Length and Telomerase Activity; A Yin and Yang of Cell Senescence
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Cited by 29 •
2013
An accurate, short, sophisticated and cheap method is described that assesses telomere length in multiple tissues and species using qRT-PCR. In addition, we will describe a simple assay to assess telomerase activity as a complementary backbone test for telomere length.
01:44
Termination of Translation
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2020
The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...
FAQs
The chromosome-end location places the terminal nucleotide at the boundary where DNA replication is incomplete and repair machinery could misinterpret the end as damage. Since conventional DNA polymerases cannot fully copy the 5′ ends of linear DNA molecules, specialized telomeric structures are needed to preserve chromosome-end integrity and reduce the risk of genetic information loss or mistaken repair.
A single-stranded 3′ overhang provides a specialized chromosome-end feature that can fold into protective configurations. This folding helps distinguish a natural chromosome terminus from an accidental DNA break, limiting inappropriate repair responses. Studying the terminal nucleotide therefore requires considering not only the final base itself, but also the higher-order structure formed at the surrounding telomeric end.
Telomerase extends telomeric DNA in cells that require continued proliferation, counteracting the progressive loss associated with incomplete replication of linear chromosome ends. Its activity helps maintain chromosome-end structures over repeated cell divisions. This makes telomerase especially relevant when interpreting how terminal nucleotide integrity is preserved in proliferating cells compared with cells that eventually stop dividing.
Progressive shortening reduces the ability of telomeric chromosome ends to maintain protective structures. Once end protection becomes inadequate, cells may enter senescence, a state in which proliferation stops, or develop genome instability. These outcomes connect terminal nucleotide research to the balance between limiting the division of damaged cells and preserving chromosome integrity during cellular proliferation.
Investigating the terminal nucleotide helps researchers examine how chromosome ends are maintained, protected, and affected by replication limits. The resulting information can clarify relationships among telomere shortening, cellular senescence, genome instability, aging, cancer biology, and inherited telomere disorders. Its value is therefore broader than describing one DNA base, because it links chromosome-end behavior to major biological outcomes.
Telomere terminal nucleotide research provides a chromosome-end perspective on several biological conditions. Progressive shortening is associated with cellular senescence and can influence genome instability, making it relevant to aging and cancer biology. Inherited telomere disorders add a disease context in which chromosome-end maintenance is disrupted, allowing researchers to study how telomeric defects affect cell behavior and genetic stability.