Huckebein is part of a combinatorial repression code in the anterior blastoderm

Autor(es)

Andrioli, Luiz Paulo ^{[1, 2]} ; Digiampietri, Luciano Antonio ^[1] ; de Barros, Lilian Ponce ^[1] ; Machado-Lima, Ariane ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Escola Artes Ciencias & Humanidades, BR-03828000 Sao Paulo - Brazil

^[2] Univ Sao Paulo, Inst Biociencias, Dept Genet & Biol Evolut, BR-05508000 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Developmental Biology; v. 361, n. 1, p. 177-185, JAN 1 2012.
• Citações Web of Science: 5

Resumo

The hierarchy of the segmentation cascade responsible for establishing the Drosophila body plan is composed by gap, pair-rule and segment polarity genes. However, no pair-rule stripes are formed in the anterior regions of the embryo. This lack of stripe formation, as well as other evidence from the literature that is further investigated here, led us to the hypothesis that anterior gap genes might be involved in a combinatorial mechanism responsible for repressing the cis-regulatory modules (CRMs) of hairy (h), even-skipped (eve), runt (run), and fushi-tarazu (ftz) anterior-most stripes. In this study, we investigated huckebein (hkb), which has a gap expression domain at the anterior tip of the embryo. Using genetic methods we were able to detect deviations from the wild-type patterns of the anterior-most pair-rule stripes in different genetic backgrounds, which were consistent with Hkb-mediated repression. Moreover, we developed an image processing tool that, for the most part, confirmed our assumptions. Using an hkb misexpression system, we further detected specific repression on anterior stripes. Furthermore, bioinformatics analysis predicted an increased significance of binding site clusters in the CRMs of h 1, eve 1, run 1 and ftz 1 when Hkb was incorporated in the analysis, indicating that Hkb plays a direct role in these CRMs. We further discuss that Hkb and Slp1, which is the other previously identified common repressor of anterior stripes, might participate in a combinatorial repression mechanism controlling stripe CRMs in the anterior parts of the embryo and define the borders of these anterior stripes. (C) 2011 Elsevier Inc. All rights reserved. (AU)

• Processo FAPESP: 09/10413-5 - Gerenciamento e composição automática de serviços web semânticos
• Beneficiário: Luciano Antonio Digiampietri
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 03/01640-1 - Regulação dos genes de segmentação expressos na cabeça no início do desenvolvimento de Drosophila melanogaster
• Beneficiário: Luiz Paulo Moura Andrioli
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 03/12147-4 - Regulação dos genes de segmentação expressos na cabeça no início do desenvolvimento de Drosophila melanogaster
• Beneficiário: Luiz Paulo Moura Andrioli
• Modalidade de apoio: Bolsas no Brasil - Jovens Pesquisadores