Based on a systematic analysis of the mitochondrial genome, Radek Szklarczyk and Martijn Huynen at Radboud University Medical Center in The Netherlands were able to estimate that "the mitochondrial proteome expanded at least 50% since the common ancestor of human and yeast." The authors' work, which appears this week in Genome Biology, found that gene duplications led to the expansion in humans, and that the most common of these are intra-mitochondrial and inter-compartmental.

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Jay Shendure and his colleagues have developed a new method to more comprehensively identify human cell types, the NY Times reports.

Researchers in the UK and Japan have shown that infertility in mice with three sex chromosomes can be overcome, according to the Guardian.

China is embracing preimplantation genetic diagnosis, Nature News reports. 

In PLOS this week: host genetic factors associated with cervical neoplasia progression, population patterns for an ancient flowering rainforest plant, and more.