Transdetermination is defined as a switch in lineage commitment in a stem or progenitor cell to a closely related cell type. This is in contrast to transdifferentiation, which occurs when a differentiated cell switches to another differentiated lineage without an intermediate stage of dedifferentiation.
What is the description of transdifferentiation?
Definition. Transdifferentiation is the conversion of a cell type present in one tissue or organ into a cell type from another tissue or organ without going through a pluripotent cell state. Transdifferentiation between some cell types can occur naturally in response to injury and can be induced experimentally.
How many imaginal discs does Drosophila have?
19 discs
The imaginal discs get their name since they are ‘disc’-shaped structures that will originate the imago. How many imaginal discs does a fly have? There are 19 discs in total: the epidermis of the head, thorax and limbs of the fly come from 9 bilateral pairs of discs and the genitalia come from a medial disc.
What type of cells are contained in the blastema?
blastema, also called Regeneration Bud, in zoology, a mass of undifferentiated cells that has the capability to develop into an organ or an appendage. In lower vertebrates the blastema is particularly important in the regeneration of severed limbs.
What are imaginal cells?
Imaginal cells are tissue-specific progenitors allocated in embryogenesis that remain quiescent during embryonic and larval life. During Drosophila metamorphosis, most larval cells die. Pupal and adult tissues form from imaginal cells.
What are imaginal tissues?
An imaginal disc is a sac-like epithelial structure found inside the larva of insects that undergo metamorphosis. Once the larva turns into a pupa, almost all the larval tissues degenerate and the imaginal discs turn into the external structures of the head, thorax, limbs and genitalia.
Which type of cell is unspecialized?
Stem cells
Stem cells have unspecialized capability and do not have tissue- specific structures to perform specialized functions. They can give rise to specialized cells: Stem cells go through a process called differentiation and create special types of cells (muscle, nerve, skin, etc.).
What are blastema cells made of?
Historically, blastemas were thought to be composed of undifferentiated pluripotent cells, but recent research indicates that in some organisms blastemas may retain memory of tissue origin.
Are blastema cells stem cells?
The limb blastema cell, which is a major source of mesenchymal components in the limb regenerate, serves as a stem cell that possesses an undifferentiated state and multipotency. A remarkable property of the limb blastema cell can be seen in its capability for morphogenesis.
What does the word imaginal mean?
: of, relating to, or involving imagination, images, or imagery. imaginal. adjective.
