title: Analysis of the Plasmodium and Anopheles transcriptomes during oocyst differentiation.
abstract: Understanding the life cycle of the malaria parasite in its mosquito vector is essential for developing new strategies to combat this disease. Subtractive hybridization cDNA libraries were constructed that are enriched for Plasmodium berghei and Anopheles stephensi genes expressed during oocyst differentiation on the midgut. Sequencing of 1485 random clones led to the identification of 1137 unique expressed sequence tags. Of the 608 expressed sequence tags with data base hits, 320 (53%) had significant matches to the non-redundant protein data base, whereas 288 (47%) with matches only to genomic data bases represent novel Plasmodium and Anopheles genes. Transcription of six novel parasite genes and two previously identified asexual stage genes was up-regulated during oocyst differentiation. In addition, the mRNA for an Anopheles fibrinogen domain gene was induced on day 2 after an infectious blood meal, at the time of ookinete to oocyst differentiation. The subcellular distribution of MAEBL, a sporozoite surface protein, is developmentally regulated from presumed storage organelles in day 15 oocysts to uniform distribution on the surface in day 22 oocysts. This redistribution may reflect a sporozoite maturation program in preparation for salivary gland invasion. Furthermore, apical membrane antigen 1, another parasite surface molecule, is translationally regulated late in sporozoite development, suggesting a role during infection of the vertebrate host. The present results and those of an accompanying report (Abraham, E. G., Islam, S., Srinivasan, P., Ghosh, A. K., Valenzuela, J., Ribeiro, J. M., Kafatos, F. C., Dimopoulos, G., & Jacobs-Lorena, M. (2003) J. Biol. Chem. 279, 5573-5580) provide the foundation for studies seeking to understand at the molecular level Plasmodium development and its interactions with the mosquito.
authors: Department of Genetics, Case Western Reserve University, Cleveland, Ohio 44106, USA.
authors: Prakash
authors: P
authors: Srinivasan
authors: Eappen G
authors: EG
authors: Abraham
authors: Anil K
authors: AK
authors: Ghosh
authors: Jesus
authors: J
authors: Valenzuela
authors: Jose M C
authors: JM
authors: Ribeiro
authors: George
authors: G
authors: Dimopoulos
authors: Fotis C
authors: FC
authors: Kafatos
authors: John H
authors: JH
authors: Adams
authors: Hisashi
authors: H
authors: Fujioka
authors: Marcelo
authors: M
authors: Jacobs-Lorena
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000852:Anopheles / Q000378:metabolism*; D015152:Blotting, Northern; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000378:metabolism; D004199:Disease Vectors; D004330:Drosophila; D020224:Expressed Sequence Tags; D005340:Fibrinogen / Q000737:chemistry / Q000378:metabolism; D015723:Gene Library; D015151:Immunoblotting; D007303:Insect Vectors; D051379:Mice; D008856:Microscopy, Fluorescence; D008969:Molecular Sequence Data; D005810:Multigene Family; D009865:Oocytes / Q000378:metabolism*; D010961:Plasmodium / Q000378:metabolism*; D010962:Plasmodium berghei / Q000378:metabolism; D017434:Protein Structure, Tertiary; D012313:RNA / Q000737:chemistry; D017386:Sequence Homology, Amino Acid; D013045:Species Specificity; D013997:Time Factors; D014158:Transcription, Genetic
chemical_list: D018076:DNA, Complementary; D012313:RNA; D005340:Fibrinogen