An equivalence group is a set of unspecified cells that have the same developmental potential or ability to adopt various fates. Our[who?] current understanding suggests that equivalence groups are limited to cells of the same ancestry, also known as sibling cells.[1] Often, cells of an equivalence group adopt different fates from one another.[2]
Equivalence groups assume various potential fates in two general, non-mutually exclusive ways. One mechanism, induction, occurs when a signal originating from outside of the equivalence group specifies a subset of the naïve cells.[2] Another mode, known as lateral inhibition, arises when a signal within an equivalence group causes one cell to adopt a dominant fate while others in the group are inhibited from doing so.[3] In many examples of equivalence groups, both induction and lateral inhibition are used to define patterns of distinct cell types.
Cells of an equivalence group that do not receive a signal adopt a default fate. Alternatively, cells that receive a signal take on different fates.[2][4] At a certain point, the fates of cells within an equivalence group become irreversibly determined, thus they lose their multipotent potential. The following provides examples of equivalence groups studied in nematodes and ascidians.
^Nishida and Satoh; Satoh, N (1989). "Determination and regulation in the pigment cell lineage of the ascidian embryo". Dev Biol. 132 (2): 355–67. doi:10.1016/0012-1606(89)90232-7. PMID 2494088.
^ abcGreenwald and Rubin; Rubin, GM (1992). "Making a difference: the role of cell-cell interactions in establishing separate identities for equivalent cells". Cell. 68 (2): 271–81. doi:10.1016/0092-8674(92)90470-W. PMID 1365402. S2CID 11901508.
^Nishida; Saitoh, Takashi; Matsumoto, Midori; Makabe, Kazuhiro W.; Nishida, H. (1997). "Notch homologue from Halocynthia roretzi is preferentially expressed in the central nervous system during ascidian embryogenesis". Dev Genes Evol. 207 (6): 371–380. doi:10.1007/s004270050126. PMID 27747436. S2CID 3181110.
^Huang and Weisblat; Weisblat, DA (1996). "Cell fate determination in an annelid equivalence group". Development. 122 (6): 1839–47. doi:10.1242/dev.122.6.1839. PMID 8674423.
An equivalencegroup is a set of unspecified cells that have the same developmental potential or ability to adopt various fates. Our[who?] current understanding...
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