Yield of mRNA was quantified with a Nano find more info drop spectrophotometer. mRNA was used for double stranded cDNA Inhibitors,Modulators,Libraries synthesis with ZAP cDNA Synthesis Kit follow ing the manufacturers protocol. Ligations, packaging, titering of the packaging reac tions, and plaque lifts were conducted following the manufacturers protocol of ZAP cDNA Gigapack III Gold Cloning Kit. cDNA library screening for target genes The apomictic BC8 ovary and anther enriched cDNA library was screened with a 32P labeled probes with transcripts mapping to the ASGR carrier chromosome. The PCR fragments amplified from apomictic BC8 geno mic DNA with the primers used for assigning a frag ment to the ASGR carrier chromosome were diluted and labeled with a 32P by PCR in a total volume of 20 ul. The labeling reaction contained 0.
1 ng primary PCR fragment, 1. 25 unit Jumpstart Taq DNA polymer ase, Inhibitors,Modulators,Libraries 0. 25 uM of each primer, 0. 5 mM dATP dTTP dGTP mixture, 5 ul of a 32P labeled dCTP and 1 �� PCR buffer. Probes were purified by col umns, which were assembled with Ultrafree MC Cen trifugal Filter Units. Pre hybridization of the membranes in hybridization buffer containing 0. 1 mg ml 1 salmon sperm DNA, which was denatured in boiling water for 10 minutes and cooled on ice before adding to the hybridization solu tion, was conducted at 65 C for 4 h before addition of the labeled, denatured probe. Hybridization was con ducted at 65 C overnight followed by three washes at the same temperature for 30 min each with the follow ing buffers, 1 1 �� SSC, 0. 1% SDS, 2 0. 5 �� SSC, 0. 1% SDS, 3 0. 1 �� SSC, 0. 1% SDS.
After the final wash, membranes were wrapped with plastic film and exposed to x ray film overnight at 80 C prior to manually devel oping with Kodak GBX Developer and Fixer. Autoradiographs were aligned with the respective plates Inhibitors,Modulators,Libraries to recover hybridizing plaques with sterile glass pipettes. Recovered plaques were released in tubes containing 1. 0 ml SM phage buffer and 20 ul chloroform. After overnight Inhibitors,Modulators,Libraries elution at 4 C, 1 ul SM buffer of each recovered sample was used for PCR to verify positive signals. Since the primary screening was carried out with a high density of plaque clones, the recovered positive plaques were purified after secondary and tertiary screens at much lower densities. Single pla ques showing positive hybridization signals Inhibitors,Modulators,Libraries were recov ered in 500 ul SM buffer with 10 ul chloroform at 4 C.
Sequencing and mapping of candidate cDNA clones to the ASGR In vivo excision of single plaque clones was conducted using ExAssist helper phage with SOLR strain follow ing the protocol in the manual of ZAP cDNA selleck catalog Giga pack III Gold Cloning Kit. Single colonies containing the pBluescript double stranded phagemid with the cloned cDNA insert were isolated and cultured in liquid Luria Bertani medium containing 100 ug mL 1 ampicillin at 37 C overnight.