Totipotenza

La totipotenza è la proprietà delle cellule vegetali o di una singola cellula staminale animale di svilupparsi in un intero organismo e persino in tessuti extra-embrionali.

Un esempio di cellula totipotente è il blastomero.

Le cellule staminali totipotenti danno luogo, durante lo sviluppo precoce, a cellule staminali pluripotenti, in grado di specializzarsi in cellule appartenenti ai tre foglietti embrionali. Infine, cellule staminali unipotenti possono trasformarsi solamente in alcune specie cellulari, per esempio in sangue, o in tessuto osseo.

Oltre che delle cellule staminali animali, la totipotenza è propria anche e soprattutto delle cellule vegetali; una singola cellula vegetale infatti ha la capacità di rigenerare un intero individuo, e questa capacità di riprogrammazione è molto sfruttata per la coltura in vitro.

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