- Which cell has the highest telomerase activity?
- Is telomerase a prokaryote?
- Why is telomerase RNA double stranded?
- Can telomerase reverse aging?
- Is telomerase a ribonucleoprotein?
- Do humans have telomerase?
- What is telomerase activity?
- What kinds of cells have high levels of telomerase?
- What types of cells have telomerase?
- Which cells contain active telomerase enzyme?
- Can telomerase make us immortal?
- Do cancer cells make telomerase?
Which cell has the highest telomerase activity?
For example, gut stem cells or haematopoietic stem cells show highly active telomerase, while telomerase in heart and brain stem cells is far less active, since these organs have a slower turnover rate.
The genes for the telomerase subunits in humans are localized at chromosome 5p15 (for TERT) and 3q26 (for TR)..
Is telomerase a prokaryote?
Most prokaryotes with circular genome do not have telomeres. … In prokaryotes, the end-replication problem is solved by having circular DNA molecules as chromosomes. Another cause of telomere shortening is oxidative stress.
Why is telomerase RNA double stranded?
How does telomerase work? The enzyme binds to a special RNA molecule that contains a sequence complementary to the telomeric repeat. … When the overhang is long enough, a matching strand can be made by the normal DNA replication machinery (that is, using an RNA primer and DNA polymerase), producing double-stranded DNA.
Can telomerase reverse aging?
An enzyme called telomerase can slow, stop or perhaps even reverse the telomere shortening that happens as we age. The amount of telomerase in our bodies declines as we age.
Is telomerase a ribonucleoprotein?
Telomerase is a ribonucleoprotein (RNP) enzyme with two catalytically essential subunits: the telomerase reverse transcriptase protein (TERT) and the telomerase RNA (TER).
Do humans have telomerase?
Telomerase regulation in human somatic cells. Most human somatic cells do not produce active telomerase and do not maintain stable telomere length with proliferation. Most or all do have telomerase RNP, which raises the possibility of a second telomerase function independent of DNA synthesis.
What is telomerase activity?
Telomerase is the enzyme responsible for maintenance of the length of telomeres by addition of guanine-rich repetitive sequences. Telomerase activity is exhibited in gametes and stem and tumor cells. … Besides catalytic telomere elongation, independent telomerase functions can be also involved in cell cycle regulation.
What kinds of cells have high levels of telomerase?
Germ cells have high levels of telomerase activity during rapid proliferation. Although telomerase activity is diminished in non-proliferating sperms and ova, it is highly activated after fertilisation and maintained in ES cells and germ cells for the next generation.
What types of cells have telomerase?
Telomerase is found in fetal tissues, adult germ cells, and also tumor cells. Telomerase activity is regulated during development and has a very low, almost undetectable activity in somatic (body) cells.
Which cells contain active telomerase enzyme?
Telomerase activity is extinguished during embryonic differentiation in most somatic cells but remains active in some tissues, such as male germ cells, activated lymphocytes, and certain types of stem cell populations (124, 210, 249).
Can telomerase make us immortal?
Telomerase is thus able to extend the life-span a cell, and has been dubbed the “immortality” enzyme. … In fact, we now know that 90% of all malignant tumors have found a way to turn on telomerase, and use it to essentially become immortal.
Do cancer cells make telomerase?
It is turned on when making sperm and eggs and in some very early stages of life – in cells that will have to divide a lot. And it is turned on when cells become cancerous. Cancer cells may reactivate telomerase by changing the DNA around one of the genes that makes telomerase, called TERT.