A simple and sensitive assay for distinguishing the expression of ricin and Ricinus communis agglutinin genes in developing castor seed (R. communis L.).
Castor oil is the only commercial source of ricinoleic acid and has numerous industrial applications. Among the factors limiting domestic production of castor oil is the presence of the toxin ricin and its less toxic homologue Ricinus communis agglutinin (RCA) in seeds. Although the sequences of ricin and RCA genes are known, their transcriptional expression patterns have not been distinguished due to their high degree of sequence similarity. As the information is critical for assessing success in developing a ricin-free castor crop using genetic silencing, we have designed a gene specific reverse transcription-polymerase chain reaction (RT-PCR) assay to examine the expression of the ricin and RCA genes in developing seeds. The results show that the ricin and RCA mRNA are highly abundant in seeds during the development of endosperm, and the expression pattern is similar to that observed in the Northern analysis. The RT-PCR results can be confirmed by a simple RT-PCR-based restriction fragment analysis.
Chen
Grace Q
GQ
Western Regional Research Center, Agricultural Research Service, U.S. Department of Agriculture, 800 Buchanan Street, Albany, California 94710, USA. QHGC@pw.usda.gov
He
Xiaohua
X
McKeon
Thomas A
TA
D015152:Blotting, Northern; D015870:Gene Expression; D037121:Plant Lectins / Q000235:genetics*; D012333:RNA, Messenger / Q000032:analysis; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012276:Ricin / Q000235:genetics*; D012278:Ricinus / Q000235:genetics*; D012639:Seeds / Q000235:genetics* / Q000254:growth & development*; D012680:Sensitivity and Specificity
D037121:Plant Lectins; D012333:RNA, Messenger; C017707:Ricinus communis agglutinin-1; D012276:Ricin