Early developmental stages of a protozoan parasite, Marteilioides chungmuensis (Paramyxea), the causative agent of the ovary enlargement disease in the Pacific oyster, Crassostrea gigas

International Journal for Parasitology
Naoki ItohKazuo Ogawa

Abstract

A paramyxea, Marteilioides chungmuensis, causes the irregular enlargement of the ovary in the Pacific oyster, Crassostrea gigas in Korea and Japan. The knowledge about the life cycle of the parasite has been limited to the sporulation stages within the oocyte of oysters. In this study, we used the parasite-specific DNA probes and electron microscopy to experimentally infected oysters in a field and successfully clarified early developmental stages of the parasite. The parasite invaded the oysters through the epithelial tissues of the gills, mantle and labial palps. Extrasporogony repeatedly occurred in the connective tissues by binary fusion. The inner cell of the extrasporogonic stage migrated into the gonadal epithelium, invaded the oocyte to start sporulation.

Citations

Jul 6, 2014·Diseases of Aquatic Organisms·Simone SühnelSusan M Bower
May 29, 2012·Journal of Invertebrate Pathology·Hee Jung ChoiMyoung Ae Park
Jun 10, 2008·Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology·Naoki Itoh, Keisuke G Takahashi
Aug 21, 2007·Fish & Shellfish Immunology·Naoki ItohJerome F La Peyre
Aug 5, 2015·Journal of Invertebrate Pathology·Noèlia CarrascoNaoki Itoh

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