title: Starvation-responsive glycine-rich protein gene in the silkworm Bombyx mori.
abstract: Four glycine-rich protein (GRP) genes were identified from expressed sequence tags of the maxillary galea of the silkworm. All four genes were expressed in the maxillary pulp, antenna, labrum, and labium, but none of the genes were expressed in most internal organs. Expression of one of the genes, termed bmSIGRP, was further increased approximately fivefold in the mouth region (including the maxilla, antenna, labrum, labium, and mandible) after 24 h of starvation. bmSIGRP expression peaked at 24 h and gradually declined during the subsequent 2 days. When a synthetic diet not containing proteins was fed, bmSIGRP expression increased significantly in the mouth region to levels similar to that observed in starved larvae. Synthetic diets that lacked vitamins or salts but contained amino acids did not significantly affect bmSIGRP expression. These results suggest that amino acid depletion increases bmSIGRP expression.
authors.affiliation: Division of Insect Sciences, National Institute of Agrobiological Sciences, 1-2 Owashi, Tsukuba, Ibaraki, 305-8634, Japan, taniai@affrc.go.jp.
authors.forename: Kiyoko
authors.initials: K
authors.lastname: Taniai
authors.forename: Chikara
authors.initials: C
authors.lastname: Hirayama
authors.forename: Kazuei
authors.initials: K
authors.lastname: Mita
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Asaoka
mesh_terms: D000595:Amino Acid Sequence; D000596:Amino Acids / Q000032:analysis; D000818:Animals; D001483:Base Sequence; D012831:Bombyx; D005260:Female; D006458:Hemolymph / Q000737:chemistry; D019476:Insect Proteins / Q000737:chemistry / Q000235:genetics*; D008297:Male; D008969:Molecular Sequence Data; D013217:Starvation / Q000235:genetics*
chemical_list: D000596:Amino Acids; D019476:Insect Proteins
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