title: CLONING AND EXPRESSING TRYPSIN MODULATING OOSTATIC FACTOR IN Chlorella desiccata TO CONTROL MOSQUITO LARVAE.
abstract: The insect peptide hormone trypsin modulating oostatic factor (TMOF), a decapeptide that is synthesized by the mosquito ovary and controls the translation of the gut's trypsin mRNA was cloned and expressed in the marine alga Chlorella desiccata. To express Aedes aegypti TMOF gene (tmfA) in C. desiccata cells, two plasmids (pYES2/TMOF and pYDB4-tmfA) were engineered with pKYLX71 DNA (5 Kb) carrying the cauliflower mosaic virus (CaMV) promoter 35S(2) and the kanamycin resistant gene (neo), as well as, a 8 Kb nitrate reductase gene (nit) from Chlorella vulgaris. Transforming C. desiccata with pYES2/TMOF and pYDB4-tmfA show that the engineered algal cells express TMOF (20 ± 4 μg ± SEM and 17 ± 3 μg ± SEM, respectively in 3 × 10(8) cells) and feeding the cells to mosquito larvae kill 75 and 60% of Ae. aegypti larvae in 4 days, respectively. Southern and Northern blots analyses show that tmfA integrated into the genome of C. desiccata by homologous recombination using the yeast 2 μ circle of replication and the nit in pYES2/TMOF and pYDB4-tmfA, respectively, and the transformed algal cells express tmfA transcript. Using these algal cells it will be possible in the future to control mosquito larvae in the marsh.
authors.affiliation: USDA ARS, Subtropical Horticultural Laboratory, Ft. Pierce, Florida, USA.
authors.forename: Dov
authors.initials: D
authors.lastname: Borovsky
authors.affiliation: Bayer CropScience AG, Monheim, Germany.
authors.forename: Andeas
authors.initials: A
authors.lastname: Sterner
authors.affiliation: Citrus Research and Education Center, University of Florida-IFAS, Ft. Pierce, Florida, USA.
authors.forename: Charles A
authors.initials: CA
authors.lastname: Powell
mesh_terms: D000330:Aedes / Q000235:genetics* / Q000254:growth & development / Q000378:metabolism; D000818:Animals; D002708:Chlorella / Q000235:genetics* / Q000378:metabolism; D003001:Cloning, Molecular; D007301:Insect Hormones / Q000235:genetics* / Q000378:metabolism; D019476:Insect Proteins / Q000235:genetics* / Q000378:metabolism; D007814:Larva / Q000235:genetics / Q000254:growth & development / Q000378:metabolism; D030781:Organisms, Genetically Modified / Q000235:genetics / Q000378:metabolism; D036361:Peptide Hormones / Q000235:genetics* / Q000378:metabolism; D010572:Pest Control, Biological / Q000379:methods*; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism
chemical_list: D007301:Insect Hormones; D019476:Insect Proteins; D036361:Peptide Hormones; D012333:RNA, Messenger
keywords: Aedes aegypti; Chlorella desiccata; genetic engineering; trypsin modulating oostatic factor