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Pitx genes in development and disease

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Abstract

Homeobox genes encode sequence-specific transcription factors (SSTFs) that recognize specific DNA sequences and regulate organogenesis in all eukaryotes. They are essential in specifying spatial and temporal cell identity and as a result, their mutations often cause severe developmental defects. Pitx genes belong to the PRD class of the highly evolutionary conserved homeobox genes in all animals. Vertebrates possess three Pitx paralogs, Pitx1, Pitx2, and Pitx3 while non-vertebrates have only one Pitx gene. The ancient role of regulating left–right (LR) asymmetry is conserved while new functions emerge to afford more complex body plan and functionalities. In mouse, Pitx1 regulates hindlimb tissue patterning and pituitary development. Pitx2 is essential for the development of the oral cavity and abdominal wall while regulates the formation and symmetry of other organs including pituitary, heart, gut, lung among others by controlling growth control genes upon activation of the Wnt/ß-catenin signaling pathway. Pitx3 is essential for lens development and migration and survival of the dopaminergic neurons of the substantia nigra. Pitx gene mutations are linked to various congenital defects and cancers in humans. Pitx gene family has the potential to offer a new approach in regenerative medicine and aid in identifying new drug targets.

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Acknowledgements

We apologize to our colleagues whose work could not be cited due to space limitations and our focused perspective. We thank Yen Diep for her continuous support. This work was supported by the College of Pharmacy, Oregon State University.

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This work was supported by the College of Pharmacy at the Oregon State University.

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  1. Pharmaceutical Sciences, College of Pharmacy, Oregon State University, Corvallis, OR, 97331, USA

    Thai Q Tran & Chrissa Kioussi

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Tran, T., Kioussi, C. Pitx genes in development and disease. Cell. Mol. Life Sci. 78, 4921–4938 (2021). https://doi.org/10.1007/s00018-021-03833-7

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