کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2173342 1093714 2012 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The gap gene giant of Rhodnius prolixus is maternally expressed and required for proper head and abdomen formation
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی بیولوژی سلول
پیش نمایش صفحه اول مقاله
The gap gene giant of Rhodnius prolixus is maternally expressed and required for proper head and abdomen formation
چکیده انگلیسی

The segmentation process in insects depends on a hierarchical cascade of gene activity. The first effectors downstream of the maternal activation are the gap genes, which divide the embryo in broad fields. We discovered a sequence corresponding to the leucine-zipper domain of the orthologue of the gene giant (Rp-gt) in traces from the genome of Rhodnius prolixus, a hemipteran with intermediate germ-band development. We cloned the Rp-gt gene from a normalized cDNA library and characterized its expression and function. Bioinformatic analysis of 12.5 kbp of genomic sequence containing the Rp-gt transcriptional unit shows a cluster of bona fide regulatory binding sites, which is similar in location and structure to the predicted posterior expression domain of the Drosophila orthologue. Rp-gt is expressed in ovaries and maternally supplied in the early embryo. The maternal contribution forms a gradient of scattered patches of mRNA in the preblastoderm embryo. Zygotic Rp-gt is expressed in two domains that after germ band extension are restricted to the head and the posterior growth zone. Parental RNAi shows that Rp-gt is required for proper head and abdomen formation. The head lacks mandibulary and maxillary appendages and shows reduced clypeus-labrum, while the abdomen lacks anterior segments. We conclude that Rp-gt is a gap gene on the head and abdomen and, in addition, has a function in patterning the anterior head capsule suggesting that the function of gt in hemipterans is more similar to dipterans than expected.


► We studied the gap gene giant in Rhodnius prolixus.
► We predict regulatory regions by comparative genomics.
► We show the Rp-gt expression pattern and its correlation with the phenotype in the head and abdomen.
► We show that giant is involved in the formation of the anterior most head capsule.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Developmental Biology - Volume 361, Issue 1, 1 January 2012, Pages 147–155
نویسندگان
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