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This week in PLoS One, researchers report that missense mutations in FMR1 are not a cause of the Fragile X syndrome phenotype in patients who have normal-length CGG-repeat expansions. To decipher this, the team used an array-based method to sequence FMR1 in 51 individuals exhibiting features of FXS with normal CGG-repeat tracts of the gene. The team suggests that "screening for small deletions of FMR1 may be of clinically utility."

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The Wall Street Journal reports on gaps in COVID-19 testing affecting less affluent urban areas and rural locations.

According to NBC News, new SARS-CoV-2 variants are making it harder for researchers to model the course of the pandemic.

The New York Times reports that experts say President Joe Biden's goal of vaccinating 1 million people a day in the US in the next 100 days is too low a bar.

In Science this week: single-cell lineage tracing technique applied to study lung cancer metastasis, and more.