Abstract:
:Orientia tsutsugamushi (Ots) frequently causes severe scrub typhus infections in the Asia-Pacific region. Korean investigators have demonstrated that Ots encodes five different autotransporter domain (ATD) proteins (ScaA-ScaE). ScaA functions as an adhesin and confers protective immunity in a lethal mouse model of Ots infection. Specific antibodies are detected against ScaA and ScaC in Korean scrub typhus patients. However, there is limited data on the distribution of the Sca protein genes in diverse isolates of Ots. By BLAST analysis with the conserved beta barrel autotransporter domain (ATD) regions of the sca proteins, we discovered a sixth gene scaF among 3 of 10 new partial Ots genome sequences available at NCBI GenBank (Sido, Karp, AFSC7). We designed two to seven specific TaqMan assays to detect the ATD for each of the six sca genes. The TaqMan assays among those for each sca gene which gave the greatest sensitivity and linearity with DNA log dilutions were then used for screening DNAs from Ots isolates grown in L929 mouse cells for sca genes. The sca prevalence survey was performed for all six sca genes with 178 DNAs from isolates from 12 countries. The survey results were confirmed by conventional PCR with primers from conserved regions of the passenger domains (PD) and ATD of the sca proteins. The ATD was highly conserved between the DNAs of different genotypes compared to the sca PD but each TaqMan assay was sca specific. The percentage positivity for 56 kDa and scaA genes in the 178 DNAs using Ha primers was 59.6% and 62.4%, respectively. Our scaA conventional ATD PCR assay was positive in 98.3% but scaA was present in all 178 DNAs (100%) by ATD TaqMan. scaB, scaC, scaD, scaE and scaF were detected in 33.7%, 97.8%, 93.8%, 97.2% and 43.3% isolates by ATD TaqMan, respectively. The ATDs of Ots sca genes are thus sufficiently conserved between different genotypes for molecular assay design. Four sca genes are widely distributed among diverse Ots isolates from diverse geographical areas. scaB and scaF were detected in fewer Ots isolates and absent from some available genome sequences. Whether the utility of the ScaA, ScaC, ScaD, and ScaE antigenic passenger protein domains exceeds that of the mixed 56 kDa type surface antigens of Ots now used in combination diagnostic assays needs to be determined before they can be considered as suitable alternative serological antigens for diagnosis of scrub typhus.
journal_name
PLoS Negl Trop Disjournal_title
PLoS neglected tropical diseasesauthors
Koralur MC,Ramaiah A,Dasch GAdoi
10.1371/journal.pntd.0006784subject
Has Abstractpub_date
2018-09-20 00:00:00pages
e0006784issue
9eissn
1935-2727issn
1935-2735pii
PNTD-D-18-00687journal_volume
12pub_type
杂志文章abstract:BACKGROUND:Visceral leishmaniasis (VL or kala azar) is the most serious form of human leishmaniasis, responsible for over 20,000 deaths annually, and post kala azar dermal leishmaniasis (PKDL) is a stigmatizing skin condition that often occurs in patients after successful treatment for VL. Lack of effective or appropri...
journal_title:PLoS neglected tropical diseases
pub_type: 杂志文章
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pub_type: 杂志文章
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journal_title:PLoS neglected tropical diseases
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journal_title:PLoS neglected tropical diseases
pub_type: 杂志文章
doi:10.1371/journal.pntd.0001477
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journal_title:PLoS neglected tropical diseases
pub_type: 历史文章,杂志文章
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journal_title:PLoS neglected tropical diseases
pub_type: 杂志文章,评审
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journal_title:PLoS neglected tropical diseases
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doi:10.1371/journal.pntd.0002726
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journal_title:PLoS neglected tropical diseases
pub_type: 杂志文章,随机对照试验
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journal_title:PLoS neglected tropical diseases
pub_type: 已发布勘误
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更新日期:2019-06-28 00:00:00
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journal_title:PLoS neglected tropical diseases
pub_type: 杂志文章
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journal_title:PLoS neglected tropical diseases
pub_type: 杂志文章
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journal_title:PLoS neglected tropical diseases
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更新日期:2018-03-01 00:00:00
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pub_type: 杂志文章
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