RAPD- and<i>actA</i>Gene-Typing of<i>Listeria monocytogenes</i>Isolates of Human Listeriosis, the Intestinal Contents of Cows and Beef
作者:Satoshi Inoue、Kazuhiro Katagiri、Michinori Terao、Tsutomu Maruyama
DOI:10.1111/j.1348-0421.2001.tb01280.x
日期:2001.2
AbstractSeventy‐five L. monocytogenes isolates of human listeriosis, the intestinal contents of cows and beef were divided into 5 major clusters, 17 sub‐clusters and 28 minor clusters by typing using random amplification of polymorphic DNA (RAPD). According to their major RAPD category, L. monocytogenes isolates serotyped as 1/2b and 4b were distinguished from L. monocytogenes isolates of serovars 1/2a and 1/2c. Moreover serovar 4b was distinguished from serovar 1/2b by a difference in the RAPD sub‐cluster category. All L. monocytogenes were found to possess either actA gene Type I or n, and only one actA gene type was detected in each RAPD minor cluster. actA gene Type II was observed in 32.0%, 38.5 % and 18.9% of isolates from humans, cows and beef, respectively, and was detected more frequently in serovar 4b (46.9%) than in serovars 1/2a (22.2%), 1/2b (7.7%) and 1/2c (0.0%). Twenty (80%) of 25 human isolates fell within three minor RAPD types (II‐d (16%), V‐p‐1 (36%), V‐p‐2 (28%)). Two isolates from humans and beef were found to have the same RAPD type (Type IV‐k‐1), actA gene type (Type I) and serovar (1/2b). Our results suggest that only a few genotypes of L. monocytogenes are predominant in human listeriosis in Japan, although the human isolates were collected over a broad span of time and a wide geographical range. Our results also suggest that RAPD‐, actA gene‐ and sero‐typing can be useful for epidemiological analysis.