Cosmic 6-ness Telemores and Telelmorease

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#1 •••
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Cosmic 6-ness in more ways than one. There is so many.


... 'Protecting the Ends


...The ends of our chromosomes are protected by a unique structure, called a telomere, composed of DNA and proteins. Telomeric DNA includes about a thousand repeats of the short sequence TTAGGG. Most of these repeated segments are paired with a complementary DNA strand to form a normal double helix, but several hundred nucleotides at the end are a single strand that is thought to loop back and interact with the double-stranded region. Several different types of proteins, collectively called “shelterin,” coat this telomeric DNA, protecting it.


..Add Six Bases, Repeat


..The repeated nature of the telomere holds the solution to the end shortening problem: cells use telomerase to build new repeats when the telomere gets too short. Telomerase, seen here in PDB entry 6d6v, is a molecular machine that includes a template for the telomere repeat, and an enzyme that builds the repeat onto the end of chromosomes. '..

https://pdb101.rcsb.org/motm/227

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#2 •••
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Telomeres are protective caps of repetitive DNA and proteins at the ends of chromosomes, acting like shoelace aglets to prevent unraveling, fusing, or being mistaken for broken DNA during cell division, but they shorten with each division, serving as a cellular clock that limits cell lifespan (senescence), a key process in aging and cancer development.  


Function & Structure

  1. Protection: They seal chromosome ends, preventing degradation and fusion. 

  3. Replication: They solve the "end replication problem," allowing the main DNA to be copied without loss. 

  5. Composition: In humans, they consist of thousands of repeats of the sequence TTAGGG. 

Role in Aging & Disease

  1. Cellular Aging: 
  2. As telomeres shorten with cell division, they eventually signal the cell to stop dividing, contributing to tissue aging. 

  4. Cancer: 
  5. Cancer cells often activate an enzyme called telomerase, which rebuilds telomeres, allowing them to divide indefinitely (immortality). 

  7. Therapeutic Target: 
  8. Telomere length and telomerase activity are targets for anti-aging and anti-cancer therapies. 

Factors Affecting Telomere Length

  1. Shortening Factors: 
  2. Smoking, obesity, chronic inflammation, and high alcohol intake are linked to shorter telomeres. 

  4. Lengthening Factors: 
  5. Healthy diets (Mediterranean), exercise, and certain foods (fruits, nuts, legumes) are associated with longer telomeres


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