What is the function of chromatoid bodies in Entamoeba?
Entamoeba histolytica and E. dispar are anaerobic parasitic protozoa which have trophozoites with a single nucleus. They form cysts (10–16 μm diameter) with a single nucleus when immature, which differentiate into four nuclei when mature. The cysts contain glycogen in a vacuole and usually have chromatoid bodies.
What is the function of chromatoid bodies?
The chromatoid body is crucial for spermatogenesis but its exact role in the process is not known. However, due to similarities with RNP granules found in somatic cells – such as stress granules and processing bodies – chromatoid body is thought to be involved in post-transcriptional regulation of gene expression.
What is a Chromatoid bar?
A refractile substance composed of chromatin, thought to be a nonglycogen food reserve contained within the cytoplasm of certain protozoa; seen in cysts of Entamoeba histolytica as rounded bars or chromatoidal bodies in contrast to the splintery form of chromatoid bodies in cysts of Entamoeba coli.
How can you distinguish E histolytica and Entamoeba dispar?
Entamoeba histolytica and Entamoeba dispar are morphologically identical species. In bright-field microscopy, E. histolytica/E. dispar cysts are spherical and usually measure 12 to 15 µm (range may be 10 to 20 µm).
What is the mode of transmission of Entamoeba histolytica?
MODE OF TRANSMISSION: Transmission can occur through fecal-oral route (ingestion of food and water, contaminated with feces containing E. histolytica cysts)1-3 8. Sexual transmission can also occur 3 5.
How is Entamoeba gingivalis transmitted?
They are not considered pathogenic, and feed on bacteria and other debris. Trophozoites are transmitted person-to-person orally by kissing or fomites (such as eating utensils) . The trophozoite stage of E. gingivalis is morphologically similar to that of E.
How does Entamoeba histolytica enter the human body?
E. histolytica is a single-celled protozoan that usually enters the human body when a person ingests cysts through food or water. It can also enter the body through direct contact with fecal matter.
Is the Entamoeba gingivalis a pathogenic organism?
Entamoeba gingivalis is a non-pathogenic ameba that inhabits the human oral cavity and occasionally other sites. Although it is often found in conjunction with periodontal disease, no causative association has been definitively identified. Other human-infecting species of Entamoeba are discussed under Amebiasis and Intestinal Amebae.
Where are chromatoid bodies found in an Entamoeba?
Chromatoid bodies have also been observed in the trophozoite of Entamoeba invadens, where they are smaller and more numerous than in the cyst [1] and in Entamoeba histolytica [2]. Ray and Sen Gupta [8] report that in Entamoeba histotytica the bodies contain varying amounts of DNA and RNA.
How are Balbiani and chromatoid bodies related?
Balbiani and chromatoid bodies typically also contain a number of molecules concerned with splicing and RNA regulation (Kloc, Bilinski, & Etkin, 2004; Kloc & Etkin, 2005). Such observations have led to the conclusion that the prime role of both bodies is in regulating RNA metabolism.
Is the trophozoite stage of gingivalis the same as histolytica?
The trophozoite stage of E. gingivalis is morphologically similar to that of E. histolytica. The two should be differentiated, as both can be coughed up in sputum specimens (if E. histolytica is present in pulmonary abscesses).
