Sequence updates in human assembly GRCh38: improving gene annotation


In an earlier blog post, we discussed how sequence updates in GRCh38, the most recent version of the human reference genome, filled in a gap in human chromosome 17 near position 21,300K and expanded the region by 500K (500,000 base pairs). In this post, we will again consider this same region, but with an emphasis now on how GRCh38 also improved the gene annotation.

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Figure 1. Annotation of a region of chromosome 17 near the KCNJ12 and KCNJ18 genes. Top panel: Annotation release 105 on GRCh37.p13 represented by a configured graphic display of sequence record NC_000017.10. Bottom panel: Annotation release 106 on assembly GRCh38 represented by a configured graphic display of sequence record NC_000017.11. New gene models are circled. 

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NCBI’s 3 Newest Medical Genetics Resources: GTR, MedGen & ClinVar


GTR_ClinVar_MedGen imageNCBI has three relatively new online resources for information about genetic tests, genetic conditions, and genetic variations:

  • The Genetic Testing Registry, or GTR – a registry of genetic tests for heritable and somatic changes in humans
  • MedGen – a medical genetics portal that focuses on information about medical conditions with a genetic component
  • ClinVar – an archival database that contains reported assertions about the relationship between genetic variations and phenotypes

This blog will provide a very brief overview of the three resources by outlining some of their content features. For a more thorough introduction to the three resources, including the types of information available in each and how to use them, we recommend viewing this approximately hour-long webinar that we conducted in June 2014.

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