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© Valérie Choumet
Mosquitoes were orally infected with the chikungunya virus. Midguts were dissected at day 5 post-infection, fixed and permeabilised. Virus is shown in red (anti-E2 protein, cyanine 3), the actin network in green (phalloidin 548) and nuclei in blue (DAPI).
Publication : Current microbiology

Molecular characterization of Mycobacterium avium complex isolates from Caribbean patients by DT1/DT6-PCR, nonradioactive Southern hybridization, and the Accuprobe system

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Current microbiology - 01 Dec 1996

Sola C, Devallois A, Goh KS, Legrand E, Rastogi N

Link to Pubmed [PMID] – 8900100

Curr. Microbiol. 1996 Dec;33(6):352-8

A genetic fingerprinting analysis of Caribbean isolates of M. avium complex (MAC) from AIDS patients by a Southern blotting technique after Pstl digestion with nonradioactive DNA probes coding for single-copy sequences DT1 and DT6 was performed. In parallel, a selective amplification of a 187-bp fragment within the DT6 sequence with AV6/AV7 primers for Mycobacterium avium and of a 666-bp fragment within the DT1 sequence of M. intracellulare with the IN38/IN41 primers was also performed, and the molecular speciation with these two methods was compared with results obtained with DNA probes of the Accuprobe system. 66 strains investigated comprised 31 international reference isolates of MAC belonging to serovars 1-28 and 42-44, and 35 clinical isolates including 24 strains from Caribbean AIDS patients. 91.43% of the clinical isolates tested gave concordant data with the DT1/DT6 Southern hybridization and PCR as compared with 74.28% for PCR and Accuprobe, and 71.43% for Accuprobe and Southern hybridization. Our results corroborated previous findings showing that the DT1 probe was specific for M. intracellulare, whereas the DT6 probe was specific for M. avium (reference serovars 2 and 3 probed positive both with DT1 and DT6 probes). Contrary to DT1 probe, which did not reveal sufficient polymorphism to discriminate between MAC isolates, DT6 probe showed an interesting polymorphism giving four distinct clusters. Three clusters corresponded to profiles previously reported for reference and/or clinical isolates; however, a fourth cluster was discovered in five Caribbean isolates from four AIDS patients that did not correspond to previously published genetic patterns. When probed with the insertion sequence IS1245, this cluster retained its homogeneity.

http://www.ncbi.nlm.nih.gov/pubmed/8900100