genetics47.255 min read
RNU2-2 biallelic variants reveal a prevalent recessive neurodevelopmental syndrome
11 days ago•Source: Nature
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61.23 min•14 days ago
Exome sequencing of 44,028 British South Asians uncovers thousands of rare knockouts and novel gene–phenotype links
Sequencing 44,028 British Pakistani/Bangladeshi volunteers with high autozygosity creates a large South Asian exome resource linked to health records, identifying ~4.7 million variants, 2,991 genes with rare biallelic loss-of-function genotypes (546 novel), and over 100 newly linked gene–phenotype associations. Meta-analysis with UK Biobank reinforced cardiometabolic signals, and analyses of recessive burdens and human knockouts illustrate how knockout genotypes can inform drug target safety and efficacy, aiding disease interpretation and guiding drug development. Data and code are publicly available via cloud and GitHub.
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Pangenomes Uncover Global Diversity and Divergence in Duplicated Genes
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Population-scale Insights into Somatic Mutations and Cancer Prevention
Nature•6 months ago
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RNA Stability and Degradation Speed Impact Disease Risk
This study investigates how genetic variants affecting RNA stability influence complex traits and disease risk, utilizing extensive RNA sequencing data, eQTLs, and genome editing to identify functional variants and their roles in gene regulation and disease susceptibility.
"Divergent Courtship Gene Functions in Fruit Fly Species"
A study reveals that the fruitless (fru) gene, associated with courtship behavior in fruit flies, operates differently in Drosophila melanogaster and Drosophila virilis, challenging the assumption of universal gene functionality across species. Using CRISPR-Cas9 technology, researchers found that adding fru to females of D. virilis resulted in unique outcomes compared to D. melanogaster, highlighting the importance of cross-species research to fully understand the genetic basis of behavior and development. The findings suggest that conserved genes may not guarantee identical functions across species and open new avenues for studying gene impacts across diverse species.
"The Genetic Mystery of Human Tail Loss Unraveled"
The genetic basis of tail-loss evolution in humans and apes is explored, with a focus on the role of Alu elements in the TBXT gene. The study identifies a hominoid-specific intronic AluY element in TBXT that induces alternative splicing, leading to the production of a TBXTΔexon6 isoform. This isoform is found to be associated with tail loss, as evidenced by experiments in human ES cells and mouse models. The findings provide insights into the genetic mechanism underlying the loss of the tail in hominoids and its potential link to human traits such as bipedalism.
"Unchanged for 250 Million Years: The Dynamics of Butterfly Genome Evolution"
A study on Lepidoptera, the insect order comprising moths and butterflies, reveals the dynamics of chromosome evolution and karyotype variation. The research, based on 210 chromosomal genome assemblies, identifies ancestral linkage groups (ALGs) and shows that most species have retained intact ALGs, with infrequent fusions and rare fissions. However, eight lineages have experienced extensive chromosomal rearrangements, resulting in fragmented Merian elements. The study provides insights into the constraints and mechanisms influencing chromosome evolution in Lepidoptera.
Unveiling the Genetic Basis of DNA Damage and Micronucleus Formation
A study identified genetic factors that regulate micronucleus (MN) formation in vivo by screening over 6,000 mice and found genes that either increased or decreased MN formation. The study also integrated findings with a genome-wide association study and identified potential human disease relevance. DSCC1, a gene involved in sister chromatid cohesion, was found to be critical for genome maintenance, and its deficiency led to phenotypes associated with genomic instability. Additionally, a genome-wide CRISPR–Cas9 screen revealed that SIRT1 inhibition could rescue the proliferation defect of DSCC1-deficient human cells, suggesting a potential therapeutic target for further investigation.
"55 Fascinating Genetics Facts Shared by Netizens"
Genetics facts include the potential for storing data in DNA, the inbreeding of cheetahs, the impact of genetics on drug effectiveness, the complexity of genetic inheritance, and the influence of genetics on personal traits and health conditions. Additionally, the article highlights the challenges and advancements in genetic testing, the impact of genetics on cancer risk, and the diverse and dynamic nature of genetic research.
"Genetic Variants' Influence on Pregnancy Outcomes in Chinese Mother-Baby Study"
A large genetic analysis of Chinese parents and their babies has revealed multiple links between maternal health and fetal development, including genetic variants associated with maternal weight gain, bile acid levels, and liver disease risk. The study, published in Nature, is one of the first to examine the genetic profiles of East Asians and has identified discrepancies in the effects of certain genetic variants on mothers and their babies. While the findings offer new insights, further research is needed to confirm the associations and explore potential causality.
"Slow Genome Evolution in Frogs Revealed by Conserved Chromatin and Repetitive Patterns"
A study reports a high-quality reference genome sequence for the western clawed frog, Xenopus tropicalis, along with draft chromosome-scale sequences of three distantly related emerging model frog species, revealing that frog chromosomes have remained remarkably stable since the Mesozoic Era with limited translocations and fusions. The study explores the structure of chromosomes across frogs, using a dense meiotic linkage map for X. tropicalis and chromatin conformation capture (Hi-C) data for all species, revealing conserved ancestral anuran chromosomes from which contemporary frog genomes were constructed. The findings provide essential resources for further work to exploit the experimental possibilities of these diverse animals and make anurans ripe for comparative genomic and evolutionary analysis.
Unraveling the Hagfish Genome: Insights into Vertebrate Evolution
The sequencing and analysis of the genome of the inshore hagfish, Eptatretus burgeri, sheds light on the timing and consequences of whole-genome duplication events in early vertebrate evolution. The study provides insights into the ancestral vertebrate karyotype, supports the monophyly of cyclostomes, and reveals the presence of six Hox clusters in hagfish, suggesting a distinct genome history shared by lampreys and hagfish. Additionally, the research uncovers gene family evolution and genomic changes accompanying major transitions in chordate evolution, offering essential information for comparative genomics and understanding the genetic basis of vertebrate diversity.
The Genetic Link Between Reproduction and Aging
A study utilizing data from over 276,000 people in the UK Biobank database has provided genetic evidence supporting the antagonistic pleiotropy theory of aging, which suggests that genetic mutations promoting early reproduction may also accelerate aging. The researchers found a strong negative correlation between reproduction and lifespan, indicating that genes promoting higher reproduction rates are associated with shorter lifespans. While environmental factors also play a significant role, this study highlights the trade-off between reproduction and longevity and provides genome-wide evidence for the evolutionary explanation of senescence.