Are telomeres found on both ends of DNA strands?

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SUMMARY

Telomeres are present at both the 5' and 3' ends of DNA strands, with the 3' end exhibiting a longer telomeric sequence that creates a single-stranded overhang. This overhang is crucial for forming a looped structure that protects the DNA ends from being recognized by DNA repair mechanisms. The discussion clarifies misconceptions regarding the location of telomeres on double-stranded DNA, emphasizing their protective role in genomic stability.

PREREQUISITES
  • Understanding of DNA structure and double-stranded configuration
  • Knowledge of telomere function and significance in cellular aging
  • Familiarity with DNA repair mechanisms
  • Basic comprehension of molecular biology terminology
NEXT STEPS
  • Research the role of telomerase in maintaining telomere length
  • Explore the implications of telomere shortening in aging and cancer
  • Learn about the mechanisms of DNA repair and how they interact with telomeres
  • Investigate the formation and significance of the T-loop structure in telomere protection
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Students and professionals in molecular biology, geneticists, and researchers focusing on aging, cancer biology, and DNA repair mechanisms will benefit from this discussion.

nicholaschean
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I know that telomeres are found on the ends of DNA molecules as stated by my notes. But i was wondering if they are only found on the 3' ends or both 5' and 3' because since DNA is double stranded, if it were to be found on both 5' and 3', one parental strand will be
5'-TTAGGGTTAGGGTTAGGG█████████TTAGGGTTAGGGTTAGGG-3'. By complementary base pairing, the other parental strand will be
3'-AATCCCAATCCCAATCCC█████████AATCCCAATCCCAATCCC-5' whereby there is no telomere repeat at the ends.

Please clarify this doubt thanks! :)
 
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Telomeric sequences are found on both the 5' and 3' ends of the DNA. The telomeric sequence on the 3' end is slightly longer than the sequence on the 5' end, so there will be a single-stranded overhang on the 3' end. This single stranded region is used to form a looped structure that protects the end of the DNA from recognition by the DNA repair machinery (http://pmgm2.stanford.edu/biochem118/Papers/DNA%20Papers/Telomerase%20D-Loop-TLoop.pdf )
 
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