TY - JOUR
T1 - What can the phylogeny of class i KNOX genes and their expression patterns in land plants tell us about the evolution of shoot development?
AU - Maksimova, Anastasiia I.
AU - Berke, Lidija
AU - Salgado, Marco G.
AU - Klimova, Ekaterina A.
AU - Pawlowski, Katharina
AU - Romanova, Marina A.
AU - Voitsekhovskaja, Olga V.
N1 - Anastasiia I Maksimova, Lidija Berke, Marco G Salgado, Ekaterina A Klimova, Katharina Pawlowski, Marina A Romanova, Olga V Voitsekhovskaja, What can the phylogeny of class I KNOX genes and their expression patterns in land plants tell us about the evolution of shoot development?, Botanical Journal of the Linnean Society, 2021;, boaa088, https://doi.org/10.1093/botlinnean/boaa088
PY - 2021/3/1
Y1 - 2021/3/1
N2 - KNOX genes encode transcription factors (TFs), several of which act non-cell-autonomously. KNOX genes evolved in algae, and two classes, class I KNOX and class II KNOX genes, were already present in charophytes. In tracheophytes, class I KNOX genes are expressed in shoot apical meristems (SAMs) and thought to inhibit cell differentiation, whereas class II KNOX genes are expressed in mature organs regulating differentiation. In this review, we summarize the data available on gene families and expression patterns of class I and class II KNOX genes in embryophytes. The expression patterns of class I KNOX genes should be seen in the context of SAM structure and of leaf primordium development where the inhibition of cell differentiation needs to be lifted. Although the SAMs of angiosperms and gnetophytes almost always belong to the duplex type, several other types are distributed in gymnosperms, ferns, lycopods and bryophytes. KNOX gene families remained small (maximally five genes) in the representatives of bryophytes, lycopods and ferns examined thus far; however, they expanded to some extent in gymnosperms and, independently and much more strongly, in angiosperms. The growing sophistication of mechanisms to repress and re-induce class KNOX I expression played a major role in the evolution of leaf shape.
AB - KNOX genes encode transcription factors (TFs), several of which act non-cell-autonomously. KNOX genes evolved in algae, and two classes, class I KNOX and class II KNOX genes, were already present in charophytes. In tracheophytes, class I KNOX genes are expressed in shoot apical meristems (SAMs) and thought to inhibit cell differentiation, whereas class II KNOX genes are expressed in mature organs regulating differentiation. In this review, we summarize the data available on gene families and expression patterns of class I and class II KNOX genes in embryophytes. The expression patterns of class I KNOX genes should be seen in the context of SAM structure and of leaf primordium development where the inhibition of cell differentiation needs to be lifted. Although the SAMs of angiosperms and gnetophytes almost always belong to the duplex type, several other types are distributed in gymnosperms, ferns, lycopods and bryophytes. KNOX gene families remained small (maximally five genes) in the representatives of bryophytes, lycopods and ferns examined thus far; however, they expanded to some extent in gymnosperms and, independently and much more strongly, in angiosperms. The growing sophistication of mechanisms to repress and re-induce class KNOX I expression played a major role in the evolution of leaf shape.
KW - KNOX, transcription factors, plants, evolution, shoot apical meristem
KW - duplex
KW - Homeobox
KW - Isoëtes lacustris shoot tip transcriptome
KW - monoplex
KW - shoot apical meristems
KW - simplex
UR - http://www.scopus.com/inward/record.url?scp=85104355069&partnerID=8YFLogxK
U2 - 10.1093/botlinnean/boaa088
DO - 10.1093/botlinnean/boaa088
M3 - Review article
AN - SCOPUS:85104355069
VL - 195
SP - 254
EP - 280
JO - Botanical Journal of the Linnean Society
JF - Botanical Journal of the Linnean Society
SN - 0024-4074
IS - 3
ER -