Evolution of the activation domain in a Hox transcription factor

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dc.citation.firstpage745
dc.citation.journalTitleThe International Journal of Developmental Biology
dc.citation.lastpage753
dc.citation.volumeNumber62
dc.contributor.authorLiu, Ying
dc.contributor.authorHuang, Annie
dc.contributor.authorBooth, Rebecca M.
dc.contributor.authorMendes, Gabriela Geraldo
dc.contributor.authorMerchant, Zabeena
dc.contributor.authorMatthews, Kathleen S.
dc.contributor.authorBondos, Sarah E.
dc.date.accessioned2019-01-18T17:51:30Z
dc.date.available2019-01-18T17:51:30Z
dc.date.issued2018
dc.description.abstractLinking changes in amino acid sequences to the evolution of transcription regulatory domains is often complicated by the low sequence complexity and high mutation rates of intrinsically disordered protein regions. For the Hox transcription factor Ultrabithorax (Ubx), conserved motifs distributed throughout the protein sequence enable direct comparison of specific protein regions, despite variations in the length and composition of the intervening sequences. In cell culture, the strength of transcription activation by Drosophila melanogaster Ubx correlates with the presence of a predicted helix within its activation domain. Curiously, this helix is not preserved in species more divergent than flies, suggesting the nature of transcription activation may have evolved. To determine whether this helix contributes to Drosophila Ubx function in vivo, wild-type and mutant proteins were ectopically expressed in the developing wing and the phenotypes evaluated. Helix mutations alter Drosophila Ubx activity in the developing wing, demonstrating its functional importance in vivo. The locations of activation domains in Ubx orthologues were identified by testing the ability of truncation mutants to activate transcription in yeast one-hybrid assays. In Ubx orthologues representing 540 million years of evolution, the ability to activate transcription varies substantially. The sequence and the location of the activation domains also differ. Consequently, analogous regions of Ubx orthologues change function over time, and may activate transcription in one species, but have no activity, or even inhibit transcription activation in another species. Unlike homeodomain-DNA binding, the nature of transcription activation by Ubx has substantially evolved.
dc.identifier.citationLiu, Ying, Huang, Annie, Booth, Rebecca M., et al.. "Evolution of the activation domain in a Hox transcription factor." <i>The International Journal of Developmental Biology,</i> 62, (2018) UPV/EHU Press: 745-753. https://doi.org/10.1387/ijdb.180151sb.
dc.identifier.doihttps://doi.org/10.1387/ijdb.180151sb
dc.identifier.urihttps://hdl.handle.net/1911/105106
dc.language.isoeng
dc.publisherUPV/EHU Press
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
dc.subject.keywordintrinsic disorder
dc.subject.keywordnatively unfolded
dc.subject.keywordUltrabithorax
dc.subject.keywordUbx
dc.subject.keywordevo-devo
dc.titleEvolution of the activation domain in a Hox transcription factor
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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