title: Molecular characterization of DnaJ 5 homologs in silkworm Bombyx mori and its expression during egg diapause.
abstract: A comparison of the cDNA sequences (1 056 bp) of Bombyx mori DnaJ 5 homolog with B. mori genome revealed that unlike in other Hsps, it has an intron of 234 bp. The DnaJ 5 homolog contains 351 amino acids, of which 70 contain the conserved DnaJ domain at the N-terminal end. This homolog of B. mori has all desirable functional domains similar to other insects, and the 13 different DnaJ homologs identified in B. mori genome were distributed on different chromosomes. The expressed sequence tag database analysis of Hsp40 gene expression revealed higher expression in wing disc followed by diapause-induced eggs. Microarray analysis revealed higher expression of DnaJ 5 homolog at 18th h after oviposition in diapause-induced eggs. Further validation of DnaJ 5 expression through qPCR in diapause-induced and nondiapause eggs at different time intervals revealed higher expression in diapause eggs at 18 and 24 h after oviposition, which coincided with the expression of Hsp70 as the Hsp 40 is its co-chaperone. This study thus provides an outline of the genome organization of Hsp40 gene, and its role in egg diapause induction in B. mori.
authors: Genomics Division, Seribiotech Research Laboratory, Carmelaram Post, Kodathi, Bangalore, 560035, Karnataka, India.
authors: Sasibhushan
authors: S
authors: Sirigineedi
authors: Esvaran
authors: E
authors: Vijayagowri
authors: Geetha N
authors: GN
authors: Murthy
authors: Guruprasada
authors: G
authors: Rao
authors: Kangayam M
authors: KM
authors: Ponnuvel
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D012831:Bombyx / Q000196:embryology / Q000235:genetics* / Q000378:metabolism; D018076:DNA, Complementary; D015870:Gene Expression; D018507:Gene Expression Regulation, Developmental; D049750:Genome, Insect; D050956:HSP40 Heat-Shock Proteins / Q000737:chemistry / Q000378:metabolism; D018840:HSP70 Heat-Shock Proteins / Q000737:chemistry / Q000378:metabolism; D008675:Metamorphosis, Biological; D046228:Microarray Analysis; D018832:Molecular Chaperones / Q000737:chemistry / Q000378:metabolism; D008969:Molecular Sequence Data; D010063:Ovum / Q000378:metabolism*; D060888:Real-Time Polymerase Chain Reaction
chemical_list: D018076:DNA, Complementary; D050956:HSP40 Heat-Shock Proteins; D018840:HSP70 Heat-Shock Proteins; D018832:Molecular Chaperones
keywords: Bombyx mori; DnaJ; Hsp40; diapause; exon; intron