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Wang, Guan; Zhang, Cunling; Kambara, Hiroto; Dambrot, Cheryl; Xie, Xuemei; Zhao, Li; Xu, Rong; Oneglia, Andrea; Liu, Fei; Luo, Hongbo R
Frontiers in immunology, 04/2022, Letnik: 13Journal Article
The MRP8-Cre-ires/EGFP transgenic mouse (Mrp8cre , on C57BL/6J genetic background) is popular in immunological and hematological research for specifically expressing Cre recombinase and an EGFP reporter in neutrophils. It is often crossed with other transgenic lines carrying -flanked genes to achieve restricted gene knockout in neutrophils. However, due to the way in which the line was created, basic knowledge about the MRP8-Cre-ires/EGFP transgene in the host genome, such as its integration site(s) and flanking sequences, remains largely unknown, hampering robust experimental design and data interpretation. Here we used a recently developed technique, targeted locus amplification (TLA) sequencing, to fill these knowledge gaps. We found that the MRP8-Cre-ires/EGFP transgene was integrated into chromosome 5 (5qG2) of the host mouse genome. This integration led to a 44 kb deletion of the host genomic sequence, resulting in complete deletion of and partial deletion of . Having determined the flanking sequences of the transgene, we designed a new genotyping protocol that can distinguish homozygous, heterozygous, and wildtype Mrp8cre mice. To our surprise, crossing heterozygous mice produced no homozygous Mrp8cre mice, most likely due to prenatal lethality resulting from disrupted gene expression.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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