Genomic Comparison of PE and PPE Genes in the Mycobacterium avium Complex

被引:24
作者
Mackenzie, Nick [1 ]
Alexander, David C. [2 ]
Turenne, Christine Y. [2 ]
Behr, Marcel A. [2 ]
De Buck, Jeroen M. [1 ]
机构
[1] Univ Calgary, Fac Vet Med, Dept Prod Anim Hlth, Calgary, AB T2N 4N1, Canada
[2] McGill Univ, Montreal Gen Hosp, Ctr Hlth, Div Infect Dis & Med Microbiol,Res Inst, Montreal, PQ H3G 1A4, Canada
关键词
ACQUIRED-IMMUNODEFICIENCY-SYNDROME; SINGLE NUCLEOTIDE POLYMORPHISMS; SUBSP-PARATUBERCULOSIS; CROHNS-DISEASE; SEQUENCE POLYMORPHISMS; TUBERCULOSIS COMPLEX; INSERTION ELEMENT; JOHNES-DISEASE; DIAGNOSIS; STRAINS;
D O I
10.1128/JCM.01313-08
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
The Mycobacterium avium complex (MAC) comprises genomically similar but phenotypically divergent bacteria that inhabit diverse environments and that cause disease in different hosts. In this study, a whole-genome approach was used to examine the polymorphic PE (Pro-Glu) and PPE (Pro-Pro-Glu) gene families, implicated in immunostimulation and virulence. The four major groups of MAC organisms were examined, including the newly sequenced type strains of M. intracellulare and M. avium subsp. avium, plus M. avium subsp. paratuberculosis and M. avium subsp. hominissuis, for the purpose of finding genetic differences that could be exploited to design diagnostic tests specific to these groups and that could help explain their divergence in pathogenesis and host specificity. Unique and missing PPE genes were found in all MAC members except M. avium subsp. avium. Only M. intracellulare had a unique PE gene. Apart from this, most PE and PPE sequences were conserved, with average nucleotide sequence identities of 99.1 and 98.1%, respectively, among the M. avium subspecies, but only 82.9 and 79.7% identities with the PE and PPE sequences of M. intracellulare, respectively. A detailed analysis of the amino acid sequences was performed between M. avium subsp. paratuberculosis and M. avium subsp. hominissuis. Most differences were detected in the PPE proteins, with amino acid substitutions and frame shifts leading to unique amino acid sequences. In conclusion, several unique PPE proteins were identified in MAC organisms next to numerous polymorphisms in both the PE and PPE gene families. These substantial differences could help explain the divergence in phenotypes within the MAC and could lead to diagnostic tests with better discriminatory abilities.
引用
收藏
页码:1002 / 1011
页数:10
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