Dicuonzo G, Gherardi G, Lorino G, Angeletti S, De Cesaris M, Fiscarelli E, Bessen D E, Beall B
Department of Medicine and Microbiology, Università Campus Bio-Medico, Rome, Italy.
J Clin Microbiol. 2001 May;39(5):1687-90. doi: 10.1128/JCM.39.5.1687-1690.2001.
In a study assessing genetic diversity, 114 group A streptococcus (GAS) isolates were recovered from pediatric pharyngitis patients in Rome, Italy. These isolates comprised 22 different M protein gene (emm) sequence types, 14 of which were associated with a distinct serum opacity factor/fibronectin binding protein gene (sof) sequence type. Isolates with the same emm gene sequence type generally shared a highly conserved chromosomal macrorestriction profile. In three instances, isolates with dissimilar macrorestriction profiles had identical emm types; in each of these cases multilocus sequence typing revealed that isolates with the same emm type were clones having the same allelic profiles. Ninety-eight percent of the pharyngeal isolates had emm types previously found to be highly associated with mga locus gene patterns commonly found in pharyngeal GAS isolates.
在一项评估基因多样性的研究中,从意大利罗马的小儿咽炎患者中分离出114株A组链球菌(GAS)。这些分离株包含22种不同的M蛋白基因(emm)序列类型,其中14种与独特的血清混浊因子/纤连蛋白结合蛋白基因(sof)序列类型相关。具有相同emm基因序列类型的分离株通常共享高度保守的染色体宏观限制性图谱。在三个实例中,具有不同宏观限制性图谱的分离株具有相同的emm类型;在每种情况下,多位点序列分型显示具有相同emm类型的分离株是具有相同等位基因图谱的克隆。98%的咽部分离株具有先前发现与咽部GAS分离株中常见的mga基因座基因模式高度相关的emm类型。