Analysis of Rickettsia typhi-Infected and Uninfected Cat Flea (Ctenocephalides felis) Midgut cDNA Libraries: Deciphering Molecular Pathways Involved in Host Response to R. typhi Infection

Murine typhus is a febrile disease caused by the bacterium, Rickettsia typhi (R. typhi), and transmitted via infected fleas. This study investigated midgut responses of infected versus uninfected cat fleas (Ctenocephalides felis) by constructing cDNA libraries and examining transcript levels. Select C. felis serine proteases, GTPases and defense response genes were compared to identify differences in gene expression between the two states of infection. A total of 1152 transcripts from both libraries were sequenced, generating 906 high quality sequences, 472 from the uninfected and 434 from the infected midgut library.

鼠型斑疹伤寒，由立克次体属的斑疹伤寒立克次体（Rickettsia typhi，简称R. typhi）引起，经感染跳蚤传播的一种发热性疾病。本研究通过构建cDNA文库并检测转录水平，探究了感染与未感染猫蚤（Ctenocephalides felis）中肠的响应差异。选取了C. felis的丝氨酸蛋白酶、GTP酶以及防御响应基因，与未感染状态进行对比，以识别两种感染状态下基因表达的差异。从两个文库中共测序1152个转录本，生成了906个高质量序列，其中472个来自未感染中肠文库，434个来自感染中肠文库。