Schematic of the inverse PCR cloning strategy and growth analysis of the CRISPRi library. Related to Fig 2 Schematic of the inverse PCR cloning strategy.

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Schematic of the inverse PCR cloning strategy and growth analysis of the CRISPRi library. Related to Fig 2 Schematic of the inverse PCR cloning strategy and growth analysis of the CRISPRi library. Related to Fig 2 ASchematic of the infusion cloning and comparison with inverse PCR. For the infusion method used for sgRNA cloning, two gene‐specific primers were designed for each cloning. Primer 1 and primer 2 are complementary, and they contain 15‐bp homology sequences to the adjoining region, flanking the 20‐bp base‐pairing region of the sgRNA encoding sequence of the vector. For inverse PCR, a 20‐nt new base‐pairing sequence was included in the forward gene‐specific primer. The universal reverse primer was phosphorylated, to allow circularization of the vector by ligation after amplification.B–EDefinition of the growth phenotype classification utilized in Fig 2B. The data points used in Fig 2C are indicated by double‐headed arrows. (B) Classification as OD‐difference phenotype (growth defect), exemplified by the fusA knockdown dataset. Growth curves of IPTG‐induced and uninduced cells are shown in the top graph. In the bottom graph, the difference in log2(OD595) between IPTG‐induced and uninduced cells is plotted for each time point. Datasets that contain points in the shaded area (i.e., having a > fourfold difference) are classified as having a significant growth defect. (C) Classification of the increased‐lysis phenotype exemplified by the yabA knockdown dataset. Growth curves of IPTG‐induced and uninduced cells are shown in the top graph. A best‐fit straight line is created using the last 10 data points of the IPTG‐treated cells (i.e., last 90 min). If the slope of this line is more negative than 0.05 h−1, the strain is classified as having an increased‐lysis phenotype. Additionally, datasets were normalized to the maximum OD595 reached, plotted in the bottom graph. When the normalized values of the IPTG‐induced cells fall below 0.7 (i.e., 70% of ODmax), the strain is also classified as having an increased‐lysis phenotype (shaded area). The black arrow points to the normalized dataset of bacterial growth in IPTG free medium, while the red arrow points to the normalized dataset of bacterial growth in medium with 1 mM IPTG. Note that while the example used (yabA) fulfills both criterions, fulfilling one of them is sufficient. Panels (D and E) show examples of “growth defect and increased lysis” and “No phenotype”, respectively, based on the criteria demonstrated in panels (B and C). Xue Liu et al. Mol Syst Biol 2017;13:931 © as stated in the article, figure or figure legend