Sell^tm4Hyn

The three selectin genes, Sele, Sell, and Selp, are found within a 300 kb genomic region. To generate double knockouts, ES cells heterozygote for the Selptm1Hyn and Seletm2Hyn null alleles in trans to each other were targeted a third time. A PGK-puro cassette was used to delete a 2.1 kb region containing the exons encoding the lectin domain and most of the epidermal growth factor domain. Flow cytometric analysis of homozygote leukocytes showed an absence of the L-selectin and E-selectin protein while P-selectin express was unaffected. Thus, this targeted mutation occurred in cis with the Seletm2Hyn allele and in trans with the Selptm1Hyn allele. Due to their genomic proximity, the Selltm3Hyn and Seletm2Hyn alleles should propagate together through the offspring. (J:57973)