TTAGG Telomeric Repeats in Chromosomes of Some Insects and Other Arthropods
The results, which confirm and extend earlier observations, suggest that (TTAGG)n was a phylogenetically ancestral telomere motif in the insect lineage but was lost independently in different groups, being replaced probably by other telomeres motifs.
Sex Chromosomes and Sex Determination in Lepidoptera
The sex chromosome system is being exploited in economically important species and special strains have been devised for mass rearing of male-only broods in the silkworm for higher silk production and in pest species for the release of sterile males in pest management programs.
Evolutionary dynamics of rDNA clusters on chromosomes of moths and butterflies (Lepidoptera)
- P. Nguyen, K. Sahara, A. Yoshido, F. Marec
- 1 March 2010
E ectopic recombination is proposed, i.e., homologous recombination between repetitive sequences of non-homologous chromosomes, as a primary motive force in rDNA repatterning.
Analysis of genetic information of an insect picorna-like virus, infectious flacherie virus of silkworm: evidence for evolutionary relationships among insect, mammalian and plant picorna(-like)…
Computer analysis identified the sequences similar to the consensus sequences of 2C (helicase?), 3C (protease), and 3D (RNA polymerase) conserved among mammalian and plant picorna(-like) viruses.
Phenotypic grouping of 141 BmNPVs lacking viral gene sequences.
- C. Ono, Takanori Kamagata, Hitomi Taka, K. Sahara, S. Asano, H. Bando
- BiologyVirus Research
- 1 May 2012
Phylogeny of the sex-determining gene Sex-lethal in insects.
The phylogenetic analysis shows that a single orthologue of the Drosophila Sex-lethal (Sxl) gene is present in the genomes of the malaria mosquito Anopheles gambiae, the honeybee Apis mellifera, the silkworm Bombyx mori, and the red flour beetle Tribolium castaneum.
A Second-Generation Integrated Map of the Silkworm Reveals Synteny and Conserved Gene Order Between Lepidopteran Insects
- Y. Yasukochi, Laksmikutty A. Ashakumary, K. Baba, A. Yoshido, K. Sahara
- Medicine, BiologyGenetics
- 1 July 2006
A second-generation linkage map was constructed for the silkworm, Bombyx mori, and found significant synteny and conserved gene order between B. mori and a nymphalid butterfly, Heliconius melpomene, in four linkage groups (LGs), strongly suggesting that using B.mori as a reference for comparative genomics in Lepidotera is highly feasible.
W-derived BAC probes as a new tool for identification of the W chromosome and its aberrations in Bombyx mori
- K. Sahara, A. Yoshido, Y. Yasukochi
- 24 June 2003
The results support the opinion that the B. mori W chromosome accumulated transposable elements and other repetitive sequences that also occur, but scattered, elsewhere in the respective genome.
Organization of the Hox gene cluster of the silkworm, Bombyx mori: a split of the Hox cluster in a non-Drosophila insect
- Y. Yasukochi, Laksmikutty A. Ashakumary, K. Sahara
- Biology, MedicineDevelopment, Genes and Evolution
- 14 October 2004
Fluorescence in situ hybridization analysis confirmed that the major Hox gene cluster and lab were at different locations on the same chromosome in B. mori.
Use of RNAi technology to confer enhanced resistance to BmNPV on transgenic silkworms
This is the first report to show the use of RNAi in confering enhanced viral resistance on transgenic animals and complete protection was not achieved and the transgenic larvae ultimately died.