Genome-wide identification and characterization of Fox genes in the silkworm, Bombyx mori
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The forkhead box (Fox) transcription factor family has a characteristic of forkhead domain, a winged DNA-binding domain. The Fox genes have been classified into 23 subfamilies, designated FoxA to FoxS, of which the FoxR and FoxS subfamilies are specific to vertebrates. In this review, using whole-genome scanning, we identified 17 distinct Fox genes distributed on 13 chromosomes of the silkworm, Bombyx mori. A phylogenetic tree showed that the silkworm Fox genes could be classified into 13 subfamilies. The FoxK subfamily is specifically absent from the silkworm, although it is present in other lepidopteran insects, including Danaus plexippus and Heliconius melpomene. Microarray data revealed that the Fox genes have distinct expression patterns in the tissues on day 3 of the 5th instar larva. A Gene Ontology analysis suggested that the Fox genes have roles in cellular components, molecular functions, and biological processes, except in pore complex biogenesis. An analysis of the selective pressure on the proteins indicated that most of the amino acid sites in the Fox proteins are undergoing strong purifying selection. Here, we summarize the general characteristics of the Fox genes in the silkworm, which should support further functional studies of the silkworm Fox proteins.
KeywordsFox genes Genome Identification Characterization Bombyx mori
Expressed sequence tag
Anterior/middle silk gland
Posterior silk gland
This work was funded by grants from the Hi-Tech Research and Development 863 Program of China Grant (No. 2013AA102507), the National Natural Science Foundation of China (No. 31072088), and the Fundamental Research Funds for the Central Universities in China (No.XDJK2013A001).
The authors declare that they have no competing interests. All authors have read and approved the final manuscript.
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