title: Two novel ail-positive biotype 1A strains of Yersinia enterocolitica isolated in China with unequal adhesion and invasion properties.
abstract: Yersinia enterocolitica is an enteric pathogen having six biotypes: 1A, 1B, 2, 3, 4, and 5. Different bioserotypes have been associated with varying pathogenicity, and the strains of biotype 1A lack the virulence-associated pYV-bearing genes and were once considered to be avirulent. However, there is growing epidemiological, clinical, and experimental evidence to suggest some biotype 1A isolates are virulent and can cause gastrointestinal disease. Here, we describe two biotype 1A strains discovered from 3807 isolates that carry the ail (attachment and invasion locus) gene. The two strains showed unique PFGE patterns compared to all other isolates in the Chinese Y. enterocolitica isolate PFGE database. Strain SDWL-003 isolated from a sheep shared ail sequence identical to A1 pattern, and the foxA (ferrioxamine receptor) sequence was identical to the pathogenic F5 pattern, besides, the PFGE patterns of SDWL-003 was also cluster to pathogenic branch; however it does not attach to or invade Hep-2 cells. The ail sequence of strain 2006RAT isolated from a Microtus fortis showed several mutations compared to other published genomes, and therefore formed an entirely new pathogenic pattern. Though it clustered to non-pathogenic block with foxA sequence polymorphism analysis or PFGE assay, the strain 2006RAT showed adhesion properties. The data here bring new insights into the molecular genetics of Y. enterocolitica biotype 1A, show some isolates of 1A biotype gaining potential pathogenicity using the function of the virulence gene - ail, and indicate the lateral gene transfer of ail virulence genes proceeded between pathogenic and nonpathogenic Y. enterocolitica.
authors.affiliation: National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, 102206 Beijing, China.
authors.forename: Junrong
authors.initials: J
authors.lastname: Liang
authors.affiliation: Shandong Provincial Centre for Disease Control and Prevention, 650022 Jinan, China.
authors.forename: Zhenqiang
authors.initials: Z
authors.lastname: Bi
authors.affiliation: Zhejiang Provincial Centre for Disease Control and Prevention, 450016 Hangzhou, China.
authors.forename: Guoxiang
authors.initials: G
authors.lastname: Shi
authors.affiliation: National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, 102206 Beijing, China.
authors.forename: Yuchun
authors.initials: Y
authors.lastname: Xiao
authors.affiliation: National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, 102206 Beijing, China.
authors.forename: Haiyan
authors.initials: H
authors.lastname: Qiu
authors.affiliation: Shandong Provincial Centre for Disease Control and Prevention, 650022 Jinan, China.
authors.forename: Zengqiang
authors.initials: Z
authors.lastname: Kou
authors.affiliation: Shandong Provincial Centre for Disease Control and Prevention, 650022 Jinan, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Hu
authors.affiliation: National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, 102206 Beijing, China. Electronic address: jinghuaiqi@icdc.cn.
authors.forename: Huaiqi
authors.initials: H
authors.lastname: Jing
authors.affiliation: National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, 102206 Beijing, China. Electronic address: wangxin@icdc.cn.
authors.forename: Xin
authors.initials: X
authors.lastname: Wang
mesh_terms: D000818:Animals; D001422:Bacterial Adhesion / Q000235:genetics*; D002681:China; D016000:Cluster Analysis; D004847:Epithelial Cells / Q000382:microbiology; D005798:Genes, Bacterial; D008969:Molecular Sequence Data; D009154:Mutation; D016366:Open Reading Frames; D010802:Phylogeny; D011110:Polymorphism, Genetic; D012756:Sheep; D014774:Virulence / Q000235:genetics; D037521:Virulence Factors; D015008:Yersinia enterocolitica / Q000145:classification* / Q000302:isolation & purification / Q000472:pathogenicity / Q000502:physiology*
chemical_list: D037521:Virulence Factors
keywords: Adhesion; Biotype 1A; Invasion; Yersinia enterocolitica; ail gene