Apoptosis

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Apoptosis (or programmed cell death) is one of the methods by which the cell cycle is regulated. It is in response to DNA in the cell being badly damaged, removal of dangerous cells, controlling cell numbers, and is activated by the p53 gene, this starts a cascade of events that eventually leads to capases in the cells being activated [1]. These capases can then cleave nuclear lamins, activate DNAase as well as cleave the cytoskeleton. This also leaves a destryoys mitochondria. Which leaves the cell detected from all neighbouring cells with no functioning DNA and misshapen; the cell is then engulfed but phagocytosis and digested cleanly [2]. Apoptosis can be initiated other ways however for example, in tadpoles a hormone is produced from the thyroid gland that causes apoptosis to occur in their tail when they are becoming an adult frog this causes the cells in the tail to die causing their tail to disappear [3].

References:

  1. Becker W.Bertoni G.Hardin J.Kliensmith L.(2009)The world of the cell,7th edition,San Fransisco:Pearson. p590
  2. Alberts B.Johnson A.Lewis J.Raff M.Roberts K.Walter P.(2008) molecular biology of the cell,5th edition,New york:Garland science. p1116
  3. Alberts B.Johnson A.Lewis J.Raff M.Roberts K.Walter P.(2008) molecular biology of the cell,5th edition,New york:Garland science. p1119
Alberts B.Johnson A.Lewis J.Raff M.Roberts K.Walter P.(2008) Molecular Biology of The Cell,5th edition,New york:Garland science. p1118
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