Identification and characterization of polycomb group genes in the silkworm, bombyx mori

Zhiqing Li, Tsuneyuki Tatsuke, Kosuke Sakashita, Li Zhu, Jian Xu, Hiroaki Mon, Jae Man Lee, Takahiro Kusakabe

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


Polycomb group (PcG) proteins are involved in chromatin modifications for maintaining gene repression that play important roles in the regulation of gene expression, tumorigenesis, chromosome X-inactivation, and genomic imprinting in Drosophila melanogaster, mammals, and even plants. To characterize the orthologs of PcG genes in the silkworm, Bombyx mori, 13 candidates were identified from the updated silkworm genome sequence by using the fruit fly PcG genes as queries. Comparison of the silkworm PcG proteins with those from other insect species revealed that the insect PcG proteins shared high sequence similarity. High-level expressions of all the silkworm PcG genes were maintained through day 2 to day 7 of embryogenesis, and tissue microarray data on day 3 of the fifth instar larvae showed that their expression levels were relatively low in somatic tissues, except for Enhancer of zeste (E(Z)). In addition, knockdown of each PRC2 component, such as E(Z), Extra sex combs (ESC), and Suppressor of zeste 12 (SU(Z)12), considerably decreased the global levels of H3K27me3 but not of H3K27me2. Taken together, these results suggest that insect PcG proteins are highly conserved during evolution and might play similar roles in embryogenesis.

Original languageEnglish
Pages (from-to)5575-5588
Number of pages14
JournalMolecular biology reports
Issue number5
Publication statusPublished - May 2012

All Science Journal Classification (ASJC) codes

  • Molecular Biology
  • Genetics


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