Different combinations of gap repressors for common stripes in Anopheles and Drosophila embryos.
Drosophila segmentation is governed by a well-defined gene regulation network. The evolution of this network was investigated by examining the expression profiles of a complete set of segmentation genes in the early embryos of the mosquito, Anopheles gambiae. There are numerous differences in the expression profiles as compared with Drosophila. The germline determinant Oskar is expressed in both the anterior and posterior poles of Anopheles embryos but is strictly localized within the posterior plasm of Drosophila. The gap genes hunchback and giant display inverted patterns of expression in posterior regions of Anopheles embryos, while tailless exhibits an expanded pattern as compared with Drosophila. These observations suggest that the segmentation network has undergone considerable evolutionary change in the dipterans and that similar patterns of pair-rule gene expression can be obtained with different combinations of gap repressors. We discuss the evolution of separate stripe enhancers in the eve loci of different dipterans.
Goltsev
Yury
Y
Department of Molecular and Cellular Biology, Division of Genetics and Development, University of California, Berkeley, CA 94720, USA. goltsev@uclink.berkeley.edu
Hsiong
William
W
Lanzaro
Gregory
G
Levine
Mike
M
D000818:Animals; D000852:Anopheles / Q000196:embryology*; D019521:Body Patterning; D017931:DNA Primers; D029721:Drosophila Proteins / Q000378:metabolism; D004331:Drosophila melanogaster / Q000196:embryology*; D018507:Gene Expression Regulation, Developmental; D018398:Homeodomain Proteins / Q000378:metabolism; D017403:In Situ Hybridization; D019476:Insect Proteins / Q000378:metabolism*; D012097:Repressor Proteins / Q000378:metabolism*; D014157:Transcription Factors / Q000378:metabolism
D017931:DNA Primers; D029721:Drosophila Proteins; D018398:Homeodomain Proteins; D019476:Insect Proteins; D012097:Repressor Proteins; D014157:Transcription Factors; C052837:eve protein, Drosophila