NDLI: Expression of hunchback during trunk segmentation in the branchiopod crustacean Artemia franciscana

Content Provider	Springer Nature Link
Author	Kontarakis, Zacharias Copf, Tijana Averof, Michalis
Copyright Year	2005
Abstract	Comparative studies have shown that some aspects of segmentation are widely conserved among arthropods. Yet, it is still unclear whether the molecular prepatterns that are required for segmentation in Drosophila are likely to be similarly conserved in other arthropod groups. Homologues of the Drosophila gap genes, like hunchback, show regionally restricted expression patterns during the early phases of segmentation in diverse insects, but their expression patterns in other arthropod groups are not yet known. Here, we report the cloning of a hunchback orthologue from the crustacean Artemia franciscana and its expression during the formation of trunk segments. Artemia hunchback is expressed in a series of segmental stripes that correspond to individual thoracic/trunk, genital, and postgenital segments. However, this expression is not associated with the segmenting ectoderm but is restricted to mesodermal cells that associate with the ectoderm in a regular metameric pattern. All cells in the early segmental mesoderm appear to express hunchback. Later, mesodermal expression fades, and a complex expression pattern appears in the central nervous system (CNS), which is comparable to hunchback expression in the CNS of insects. No regionally restricted expression, reminiscent of gap gene expression, is observed during trunk segmentation. These patterns suggest that the expression patterns of hunchback in the mesoderm and in the CNS are likely to be ancient and conserved among crustaceans and insects. In contrast, we find no evidence for a conserved role of hunchback in axial patterning in the trunk ectoderm.
Starting Page	89
Ending Page	93
Page Count	5
File Format	PDF
ISSN	0949944X
Journal	Development Genes and Evolution
Volume Number	216
Issue Number	2
e-ISSN	1432041X
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-10-22
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hunchback Gap genes Crustaceans Segmented mesoderm Evolution Animal Genetics and Genomics Biochemistry Cell Biology Neurosciences Developmental Biology
Content Type	Text
Resource Type	Article
Subject	Genetics Developmental Biology

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