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Human Aging & the Telomere: " Altering the Human Lifespan " (en Inglés)
Paul F. Kisak
(Autor)
·
Createspace Independent Publishing Platform
· Tapa Blanda
Human Aging & the Telomere: " Altering the Human Lifespan " (en Inglés) - Kisak, Paul F.
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Reseña del libro "Human Aging & the Telomere: " Altering the Human Lifespan " (en Inglés)"
There is a large body of evidence to support the fact that the health of the telomere (indicated by its length) is a determinant in the lifespan of humans. For vertebrates, the sequence of nucleotides in telomeres is TTAGGG, with the complementary DNA strand being AATCCC, with a single-stranded TTAGGG overhang. This sequence of TTAGGG is repeated approximately 2,500 times in humans. In humans, average telomere length declines from about 11 kilobases at birth to less than 4 kilobases in old age, with average rate of decline being greater in men than in women. During chromosome replication, the enzymes that duplicate DNA cannot continue their duplication all the way to the end of a chromosome, so in each duplication the end of the chromosome is shortened (this is because the synthesis of Okazaki fragments requires RNA primers attaching ahead on the lagging strand). The telomeres are disposable buffers at the ends of chromosomes which are truncated during cell division; their presence protects the genes before them on the chromosome from being truncated instead. The telomeres themselves are protected by a complex of shelterin proteins, as well as by the RNA that telomeric DNA encodes (TERRA).Over time, due to each cell division, the telomere ends become shorter. This shortening is believed to play a vital role in the accuracy of the replication of the gene. The telomeres are replenished by an enzyme, telomerase reverse transcriptase. Therefore the shortening of the telomere results in transcription mistakes in the genetic replication. This book gives an overview of the process the telomere plays in human-aging and genetic replication.This book is designed to be a state of the art, superb academic reference work and provide an overview of the topic and give the reader a structured knowledge to familiarize yourself with the topic at the most affordable price possible.The accuracy and knowledge is of an international viewpoint as the edited articles represent the inputs of many knowledgeable individuals and some of the most current knowledge on the topic, based on the date of publication.
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