This Week in Cell

An international team led by investigators at the University of Montana used genome and transcriptome sequencing to untangle some of the genes involved in a three-way symbiotic relationship involving Tremblaya princeps bacteria that live inside mealybugs and another bacterial species that acts as an endosymbiont to some that bacteria. Results of the researchers' assessment suggest the mealybug genome houses 22 or more genes nabbed from bacteria through horizontal gene transfer.

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In Nature this week: Icelandic genome sequences, approach to increase CRISPR efficiency, and more.

Testing showing "genetic incompatibilities" have led thousands of couples in Saudi Arabia to call off their weddings, the BBC reports.

Decode Genetics' ability to tell Icelanders, even ones the company hasn't sequenced, about their disease risk brings up ethical questions.

Genetic analysis of Britain's King Richard III and modern descendants of his relatives indicate breaks in the male line.