title: Identification of genes expressed in the accessory glands of male Mediterranean Fruit Flies (Ceratitis capitata).
abstract: Genes expressed in the male reproductive system exhibit rapid evolutionary change and encode products that underlie striking, fitness-related phenotypes. Despite this, they have been characterised in detail in relatively few species. We report here an initial characterisation of the genes expressed in the male reproductive accessory glands of the Mediterranean Fruit Fly (Ceratitis capitata). We describe 13 independent expressed sequence tags (ESTs), of which 9 showed significant homology to known sequences and of which 4 represented novel sequences. The evidence suggests that our transcripts are not homologues of genes encoding known accessory gland proteins (Acps) in Drosophila melanogaster, but that they do encode proteins that fall into known functional categories for Acps (e.g. proteases, lipases, cysteine-rich secretory proteins [CRISPs]). Our results are consistent with the finding that among Acps there is considerable evolutionary lability at the sequence level, but evolutionary constraint at the functional level. The results highlight the extraordinary diversity of male reproductive genes.
authors.affiliation: Department of Biology, University College London, Darwin Building, Gower Street, London WC1E 6BT, UK.
authors.forename: Susan J
authors.initials: SJ
authors.lastname: Davies
authors.forename: Tracey
authors.initials: T
authors.lastname: Chapman
mesh_terms: D000818:Animals; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism; D033622:Ceratitis capitata / Q000201:enzymology / Q000235:genetics / Q000378:metabolism*; D004331:Drosophila melanogaster / Q000235:genetics; D020224:Expressed Sequence Tags / Q000378:metabolism; D005260:Female; D020869:Gene Expression Profiling; D015723:Gene Library; D017344:Genes, Insect; D005837:Genitalia, Male / Q000378:metabolism*; D019476:Insect Proteins / Q000235:genetics / Q000378:metabolism; D008049:Lipase / Q000235:genetics / Q000378:metabolism; D008297:Male; D009693:Nucleic Acid Hybridization / Q000379:methods; D010447:Peptide Hydrolases / Q000235:genetics / Q000378:metabolism; D014158:Transcription, Genetic
chemical_list: D002352:Carrier Proteins; D019476:Insect Proteins; C035606:juvenile hormone-binding protein, insect; D008049:Lipase; D010447:Peptide Hydrolases