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Castor Bean Genome Published by Research Team Including Scientists from the Venter Institute
Date:8/22/2010

ROCKVILLE, Md., Aug. 22 /PRNewswire-USNewswire/ -- A research team co-led by scientists from the J. Craig Venter Institute (JCVI) and the Institute for Genome Sciences (IGS), University of Maryland School of Medicine, today published the sequence and analysis of the castor bean (Ricinus communis) genome in Nature Biotechnology. Agnes P. Chan, Ph.D., JCVI, and Jonathan Crabtree, Ph.D., IGS were co-lead authors on the paper describing the 4.5X coverage of this important oilseed crop. The availability of the castor bean genome also has important biodefense implications since the plant produces the powerful toxin, ricin.

The castor bean, a tropical perennial shrub found in Africa and other tropical and subtropical regions in the world, is a member of the Euphorbiaceae family.  There are approximately 6,300 species in this family that includes the cassava, rubber tree, ornamental poinsettias and jatropha. While the castor bean genome is the first to be sequenced and published from this family, the jatropha genome has been sequenced by JCVI and the company Synthetic Genomics Inc.  Jatropha is also an oilseed crop.  

The sequencing of the castor bean genome to 4.5 X coverage was conducted at JCVI. The results of this work show that the genome is 350 Mb and has an estimated 31,237 genes. Because of the potential use of castor bean as a biofuel and its production of the potent toxin ricin, the team focused efforts on genes related to oil and ricin production.  They analyzed important metabolic pathways and regulatory genes involved in the production and storage of oils in the castor bean. The analyses could be important for comparative studies with other oilseed crops, and could also allow for genetic engineering of castor bean to produce oil without ricin.

Identifying and understanding the ricin–producing gene family in castor bean will be important in preventing and dealing with potential bioterrorism events.
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SOURCE J. Craig Venter Institute
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