NDLI: Genetic diversity of Dientamoeba fragilis isolates of irritable bowel syndrome patients by high-resolution melting-curve (HRM) analysis

Content Provider	Springer Nature Link
Author	Hussein, Eman M. Al Mohammed, Hamdan I. Hussein, Abdalla M.
Copyright Year	2009
Abstract	Dientamoeba fragilis is a parasite that has been recognized as a causative agent of gastrointestinal symptoms. The search for genetic variation in D. fragilis based on the small-subunit (SSU) rRNA gene using restriction fragment length polymorphism was found not useful for molecular epidemiology. In this study, genetic variability of different clinical isolates of D. fragilis was explored by high-resolution melting curve (HRM) following polymerase chain reaction (PCR) in a one-step closed-tube method. Thirty fecal samples from irritable bowel syndrome (IBS) patients having D. fragilis trophozoites and negative for other organisms were involved in this study. According to the type of diarrhea, eight patients had acute, 14 patients had chronic intermittent, and eight patients had diarrhea alternating with constipation. HRM proved that four profiles (subtypes) were present as detecting by scanning mutation. One of these profiles (profile 1) was predominant (50%). Profile 2 was present on 20%. Profiles 3 and 4 were present on 16.7% and 13.4%, respectively. No mixed profiles were detected among the samples. The melting curves characterized by $$ T_{\text{m}} 1 = 77.17\; \pm \;0.29~^\circ {\text{C}} $$ in profile 1, $$ T_{\text{m}} 1 = 77.37\; \pm \;1.45~^\circ {\text{C}} $$ in profile 2, $$ T_{\text{m}} 1 = 74.24\; \pm \;0.08~^\circ {\text{C}} $$ and $$ T_{\text{m}} 2 = 79.64\; \pm \;0.06~^\circ {\text{C}} $$ in profile 3, and $$ T_{\text{m}} 1 = 75.51\; \pm \;0.09~^\circ {\text{C}} $$ and $$ T_{\text{m}} 2 = 79.42\; \pm \;0.09~^\circ {\text{C}} $$ in profile 4. The relation between these profiles and types of diarrhea proved that the majority of patients having profile 1 (73.4%) and profile 4 (75%) had chronic intermittent diarrhea. All of the patients having profile 2 had acute diarrhea while all of the patients having profile 3 had diarrhea alternating with constipation. Although profile 1 was detected among all types of diarrhea, it was corresponding to 11/14 of patients with chronic intermittent diarrhea. All the differences were clinically and statistically significant. In conclusion, HRM following PCR was proved as a wide variation on D. fragilis genotypes that could be related to the characters of diarrhea among IBS patients. As the differences in HRM reflect different sequences of SSU RNA gene, thus, another study for identifying the sequences of these isolates (profiles) will be done and published later.
Starting Page	1053
Ending Page	1060
Page Count	8
File Format	PDF
ISSN	09320113
Journal	Parasitology Research
Volume Number	105
Issue Number	4
e-ISSN	14321955
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-06-19
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Immunology Microbiology Medical Microbiology
Content Type	Text
Resource Type	Article
Subject	Infectious Diseases Veterinary Parasitology Insect Science

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