Publications by authors named "Mary T Yohannes"

Article Synopsis
  • Major depressive disorder (MDD) is a common illness that causes difficulties in life, and scientists are studying how genetics and environment influence it.
  • This study looked at 10,032 people in Nepal to understand the genetic factors related to MDD and found that both genetics and a person's life experiences matter.
  • Although the genetic factors for MDD in Nepal were similar to those found in European studies, the methods used for predicting MDD based on European data did not work well for Nepalese people, suggesting more research is needed.
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We deployed the Blended Genome Exome (BGE), a DNA library blending approach that generates low pass whole genome (1-4× mean depth) and deep whole exome (30-40× mean depth) data in a single sequencing run. This technology is cost-effective, empowers most genomic discoveries possible with deep whole genome sequencing, and provides an unbiased method to capture the diversity of common SNP variation across the globe. To evaluate this new technology at scale, we applied BGE to sequence >53,000 samples from the Populations Underrepresented in Mental Illness Associations Studies (PUMAS) Project, which included participants across African, African American, and Latin American populations.

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Underrepresented populations are often excluded from genomic studies owing in part to a lack of resources supporting their analyses. The 1000 Genomes Project (1kGP) and Human Genome Diversity Project (HGDP), which have recently been sequenced to high coverage, are valuable genomic resources because of the global diversity they capture and their open data sharing policies. Here, we harmonized a high-quality set of 4094 whole genomes from 80 populations in the HGDP and 1kGP with data from the Genome Aggregation Database (gnomAD) and identified over 153 million high-quality SNVs, indels, and SVs.

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Article Synopsis
  • - The study focuses on understanding how purifying natural selection affects variations in non-coding regions of the human genome, alongside existing knowledge of protein-coding genes responsible for human disorders.
  • - Researchers created a comprehensive constraint map, named Gnocchi, using data from 76,156 human genomes to analyze genomic variations, with a refined model that factors in local sequences and features to identify areas with less variation.
  • - Findings indicate that while protein-coding regions show stronger constraint, certain non-coding regions related to regulatory elements are also important, suggesting that analyzing non-coding DNA can help uncover previously unidentified constrained genes linked to diseases.
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Underrepresented populations are often excluded from genomic studies due in part to a lack of resources supporting their analyses. The 1000 Genomes Project (1kGP) and Human Genome Diversity Project (HGDP), which have recently been sequenced to high coverage, are valuable genomic resources because of the global diversity they capture and their open data sharing policies. Here, we harmonized a high quality set of 4,094 whole genomes from HGDP and 1kGP with data from the Genome Aggregation Database (gnomAD) and identified over 153 million high-quality SNVs, indels, and SVs.

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African populations are the most diverse in the world yet are sorely underrepresented in medical genetics research. Here, we examine the structure of African populations using genetic and comprehensive multi-generational ethnolinguistic data from the Neuropsychiatric Genetics of African Populations-Psychosis study (NeuroGAP-Psychosis) consisting of 900 individuals from Ethiopia, Kenya, South Africa, and Uganda. We find that self-reported language classifications meaningfully tag underlying genetic variation that would be missed with consideration of geography alone, highlighting the importance of culture in shaping genetic diversity.

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bacteria are unicellular cyanobacteria that contribute significantly to global marine primary production. We report the nearly complete genome sequence of sp. strain MIT S9220, which lacks the nitrate utilization genes present in most marine genomes.

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