Abstract:
:Multiciliated cells (MCCs) differentiate hundreds of motile cilia that beat to drive fluid movement over various kinds of epithelia. In Xenopus, mice and human, the coiled-coil containing protein Mcidas (Mci) has been shown to be a key transcriptional regulator of MCC differentiation. We have examined Mci function in the zebrafish, another model organism that is widely used to study ciliary biology. We show that zebrafish mci is expressed specifically in the developing MCCs of the kidney tubules, but surprisingly, not in those of the nasal placodes. Mci proteins lack a DNA binding domain and associate with the cell-cycle transcription factors E2f4/5 for regulating MCC-specific gene expression. We found that while the zebrafish Mci protein can complex with the E2f family members, its sequence as well as the requirement and sufficiency for MCC differentiation has diverged significantly from Mci homologues of the tetrapods. We also provide evidence that compared to Gmnc, another related coiled-coil protein that has recently been shown to regulate MCC development upstream of Mci, the Mci protein originated later within the vertebrate lineage. Based on these data, we argue that in contrast to Gmnc, which has a vital role in the genetic circuitry that drives MCC formation, the requirement of Mci, at least in the zebrafish, is not obligatory.
journal_name
Dev Bioljournal_title
Developmental biologyauthors
Zhou F,Rayamajhi D,Ravi V,Narasimhan V,Chong YL,Lu H,Venkatesh B,Roy Sdoi
10.1016/j.ydbio.2020.07.005subject
Has Abstractpub_date
2020-09-15 00:00:00pages
168-177issue
2eissn
0012-1606issn
1095-564Xpii
S0012-1606(20)30199-8journal_volume
465pub_type
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journal_title:Developmental biology
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