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Notochord homeobox (NOTO)
- Target
- NOTO
- Molecular classification
- Transcription factor, Homeodomain protein, DNA-binding protein
01
Overview
Notochord homeobox (NOTO) is a conserved homeobox transcription factor gene that encodes a protein crucial for the proper formation and patterning of the notochord during vertebrate embryonic development[1][2][4][5]. NOTO acts as a master regulator of ciliogenesis in the posterior notochord, modulating the expression of a network of downstream genes (e.g., FOXJ1, RFX3) required for cilia assembly, motility, and the establishment of embryonic left–right axis. Mutation or loss of NOTO leads to severe developmental defects, particularly affecting node morphogenesis, cilia structure, and left–right asymmetry of internal organs, and is essential for specifying axial mesoderm cell fate in the embryo[1][3][4][5]. NOTO’s role is established in mammalian, amphibian, and fish embryos; orthologous genes are present in all vertebrates.
- Other names
- Homeobox protein notochordNotoFloating head (flh, zebrafish)Notnotochord homolog
02
Biological functions
Regulation of embryonic morphogenesisSpecification of axial versus paraxial mesoderm cell fateCiliogenesis (formation of cilia in the posterior notochord)Establishment of left–right asymmetry in vertebrate developmentRegulation of ciliary protein gene expression
03
Disease associations
Other (NOTO mutations disrupt embryonic development, specifically affecting notochord and left-right patterning; roles in congenital malformations but not linked to classic diseases such as cancer or inflammation)
04
Safety considerations
Therapeutic targeting problematic: As a developmental transcription factor, inhibition or manipulation of NOTO function would likely lead to severe embryonic defects, including disruption of notochord formation and randomization of left–right asymmetry of internal organsNot considered a druggable target.
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