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| Open AccessSex chromosome evolution in parasitic nematodes of humans
Many nematode worms, including Caenorhabditis elegans have XX/XO sex determination, while other species have XY. The authors use a new genome assembly of the filarial parasite Brugia malayi and published data to show that nematode sex chromosome evolution is highly plastic.
- Jeremy M. Foster
- , Alexandra Grote
- & Elodie Ghedin
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| Open AccessNuclear-mitochondrial DNA segments resemble paternally inherited mitochondrial DNA in humans
Recent evidence has questioned the dogma of strict maternal transmission of mitochondrial DNA (mtDNA) in humans. Wei et al. saw no evidence of paternal transmission of mtDNA in 11,035 human trios, and show that nuclear-mitochondrial segments (NUMTs) can give the impression of paternal mtDNA transmission, but are actually inherited through the nuclear genome.
- Wei Wei
- , Alistair T. Pagnamenta
- & Patrick F. Chinnery
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| Open AccessLow rates of mutation in clinical grade human pluripotent stem cells under different culture conditions
Mutations in human pluripotent stem cells (PSC) and whether any form during culture prior to use in a human clinical context are a concern. Here, the authors use hPSCs derived to cGMP standards and show they have low mutation rates after culture, noting this decreases on culturing in low (5%) oxygen conditions.
- Oliver Thompson
- , Ferdinand von Meyenn
- & Peter W. Andrews
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Article
| Open AccessHorizontal transfer and evolution of transposable elements in vertebrates
Horizontal transfer (HT) and evolution of transposable elements (TEs) has rarely been quantified on a large scale. Here, the authors screen 307 vertebrate genomes and infer 975 HT events (93% in ray-finned fishes); all TEs involved in HT evolve within genomes under purifying selection, as do most retrotransposons.
- Hua-Hao Zhang
- , Jean Peccoud
- & Clément Gilbert
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| Open AccessGene clustering and copy number variation in alkaloid metabolic pathways of opium poppy
The opium poppy has been a source of painkilling drugs synthesized by the benzylisoquinoline alkaloid pathway. Here, the authors report an improved genome assembly and reveal gene clustering and copy number variation in alkaloid metabolic pathways.
- Qiushi Li
- , Sukanya Ramasamy
- & Sam Yeaman
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| Open AccessMulti-resolution localization of causal variants across the genome
GWAS analysis currently relies mostly on linear mixed models, which do not account for linkage disequilibrium (LD) between tested variants. Here, Sesia et al. propose KnockoffZoom, a non-parametric statistical method for the simultaneous discovery and fine-mapping of causal variants, assuming only that LD is described by hidden Markov models (HMMs).
- Matteo Sesia
- , Eugene Katsevich
- & Chiara Sabatti
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| Open AccessGenome of Tripterygium wilfordii and identification of cytochrome P450 involved in triptolide biosynthesis
Tripterygium wilfordii is a medical plant that can produce antitumor activity compound triptolide. Here, the authors assemble its genome and identify a cytochrome P450 that can catalyze oxidation of a methyl to the acid moiety of dehydroabietic acid in triptolide biosynthesis by integrating multi-omics data.
- Lichan Tu
- , Ping Su
- & Wei Gao
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| Open AccessChromosome-level assemblies of multiple Arabidopsis genomes reveal hotspots of rearrangements with altered evolutionary dynamics
Despite tremendous genomic resources in the Arabidopsis community, only a few whole genome de novo assemblies are available. Here, the authors report chromosome-level reference-quality assemblies of seven A. thaliana accessions and reveal hotspots of rearrangements with altered evolutionary dynamics.
- Wen-Biao Jiao
- & Korbinian Schneeberger
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| Open AccessRare copy number variants in over 100,000 European ancestry subjects reveal multiple disease associations
Associations of copy number variations (CNVs) with complex traits are challenging to study because of their low frequency. Here, the authors analyse SNP array and array comparative genomic hybridization data of 100,028 individuals and report their associations with immune-related, cardiometabolic and neuropsychiatric diseases as well as cancer.
- Yun Rose Li
- , Joseph T. Glessner
- & Hakon Hakonarson
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| Open AccessPredictive impact of rare genomic copy number variations in siblings of individuals with autism spectrum disorders
Siblings of those with autism spectrum disorder (ASD) have increased likelihood of ASD or related subclinical traits. Here, studying 253 ASD families, D’Abate et al. test the predictive value of genomic copy number variation involving ASD-associated loci, with confirmation in a second cohort.
- L. D’Abate
- , S. Walker
- & S. W. Scherer
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Article
| Open AccessGenomic and transcriptomic insights into molecular basis of sexually dimorphic nuptial spines in Leptobrachium leishanense
The basis of sexual dimorphism in non-model species may be elusive, in part due to a lack of genomic and molecular resources. Here, Li et al. report a high-quality anuran genome and reveal candidate genes and pathways associated with shaping sexually dimorphic nuptial spines in a moustache toad.
- Jun Li
- , Haiyan Yu
- & Hua Wu
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| Open AccessAssembly of chromosome-scale contigs by efficiently resolving repetitive sequences with long reads
Repetitive sequences in complex eukaryote genomes can cause fragmented assemblies with incomplete gene sequences and unanchored or mispositioned contigs. Here, the authors report HERA, a method to improve genome assemblies by efficiently resolving repeats using single-molecule sequencing data.
- Huilong Du
- & Chengzhi Liang
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| Open AccessRanking of non-coding pathogenic variants and putative essential regions of the human genome
Whole genome sequencing (WGS) holds promise to solve a subset of Mendelian disease cases for which exome sequencing did not provide a genetic diagnosis. Here, Wells et al. report a supervised machine learning model trained on functional, mutational and structural features for rank-scoring and interpreting variants in non-coding regions from WGS.
- Alex Wells
- , David Heckerman
- & Julia di Iulio
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| Open AccessFull-length transcriptome reconstruction reveals a large diversity of RNA and protein isoforms in rat hippocampus
It is challenging to characterize diverse transcript isoforms by short-read sequencing. Here the authors report full-length transcriptomes in rat hippocampus by hybrid-sequencing, predict isoform-specific translational status, and reconstruct open reading frames validated by mass spectrometry.
- Xi Wang
- , Xintian You
- & Wei Chen
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| Open AccessStructural variants exhibit widespread allelic heterogeneity and shape variation in complex traits
Rare structural variants may account for a significant fraction of variation in complex traits. Here the authors analyse 14 Drosophila melanogaster genomes and find that structural variants are common, found in functionally important genes, and associated with QTLs.
- Mahul Chakraborty
- , J. J. Emerson
- & Anthony D. Long
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| Open AccessPrinciples of meiotic chromosome assembly revealed in S. cerevisiae
During meiotic prophase chromosomes organise into a series of chromatin loops, but the mechanisms of assembly remain unclear. Here the authors use Saccharomyces cerevisiae to elucidate how this elaborate three-dimensional chromosome organisation is linked to genomic sequence, and demonstrate an essential role for cohesin during this process.
- Stephanie A. Schalbetter
- , Geoffrey Fudenberg
- & Matthew J. Neale
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| Open AccessSimilarities and differences in patterns of germline mutation between mice and humans
Estimates of mutation rates differ between species. Here, Lindsay et al. perform side-by-side analyses of germline mutation rates using multi-sibling mouse and human pedigrees and find different mutation rates between species, also stratified by sex and temporal stage of mutation acquisition.
- Sarah J. Lindsay
- , Raheleh Rahbari
- & Matthew E. Hurles
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| Open AccessFunctional disease architectures reveal unique biological role of transposable elements
Transposable elements (TE) make up a large component of the human genome and have been shown to contribute to human diseases. Here, Hormozdiari
et al . estimate the contribution of TEs to the heritability of 41 complex traits and diseases and find enrichment of SINEs in blood traits.- Farhad Hormozdiari
- , Bryce van de Geijn
- & Alkes L. Price
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| Open AccessExpansion of a core regulon by transposable elements promotes Arabidopsis chemical diversity and pathogen defense
Arabidopsis plants can produce 4-hydroxyindole-3-carbonitrile (4OH-ICN) upon pathogen infection. Here, the authors show that EPCOT3, a retrotransposonderived enhancer, mediates WRKY33-binding, pathogen-responsive transcription of CYP82C2, and synthesis of 4OH-ICN.
- Brenden Barco
- , Yoseph Kim
- & Nicole K. Clay
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| Open AccessTransposition favors the generation of large effect mutations that may facilitate rapid adaption
The contribution of transposable elements (TEs) to the creation of heritable mutations is unknown. Here the authors show in Arabidopsis that TEs accumulate exponentially once mobilized and that COPIA retrotransposons preferentially integrate in environmental response genes in a H2A.Z-dependent manner.
- Leandro Quadrana
- , Mathilde Etcheverry
- & Vincent Colot
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| Open AccessExtensive intraspecific gene order and gene structural variations in upland cotton cultivars
While multiple cotton genomes are available, genome wide variation comparison between allotetraploid upland cotton cultivars remain unexplored. Here, the authors assemble two upland cotton cultivars and reveal large scale structural variations on chromosome A08.
- Zhaoen Yang
- , Xiaoyang Ge
- & Fuguang Li
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| Open AccessChromatin interaction maps reveal genetic regulation for quantitative traits in maize
Spatial organization of regulatory elements and its impact on gene expression in plants remain unclear. Here, the authors construct maize chromatin interaction maps using chromatin interaction analysis by paired-end tag sequencing (ChIA-PET) and show their associations with gene expression and agronomic traits.
- Yong Peng
- , Dan Xiong
- & Xingwang Li
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| Open AccessLong-range interactions between proximal and distal regulatory regions in maize
Chromatin interaction analysis by paired-end tag sequencing (ChIA-PET) can discover specific protein-centered chromatin interactions in high resolution. Here, the authors use ChIA-PET to reveal the complex and dynamic interactions between proximal and distal regulatory regions of genes in maize.
- En Li
- , Han Liu
- & Jinsheng Lai
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| Open AccessIntegrating Hi-C and FISH data for modeling of the 3D organization of chromosomes
Methodological advances have increased our understanding of chromatin structure through chromosome conformation capture techniques and high resolution imaging, but integration of these datasets is challenging. Here the authors propose GEM-FISH, a method for reconstructing the 3D models of chromosomes through systematically integrating both Hi-C and FISH data with the prior biophysical knowledge of a polymer model.
- Ahmed Abbas
- , Xuan He
- & Jianyang Zeng
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| Open AccessMulti-platform discovery of haplotype-resolved structural variation in human genomes
Structural variants (SVs) in human genomes contribute diversity and diseases. Here, the authors use a multi-platform strategy to generate haplotype-resolved SVs for three human parent–child trios.
- Mark J. P. Chaisson
- , Ashley D. Sanders
- & Charles Lee
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| Open AccessA high-quality apple genome assembly reveals the association of a retrotransposon and red fruit colour
Existing apple genome assemblies all derive from Golden Delicious. Here, the authors combine different sequencing technologies to assemble a high quality genome of an anther-derived homozygous genotype HFTH1 and find the association of a retrotransposon and red fruit colour.
- Liyi Zhang
- , Jiang Hu
- & Peihua Cong
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| Open AccessThe anti-cancer drugs curaxins target spatial genome organization
Curaxins are a recently discovered class of anti-cancer agents that disturbs DNA/histone interactions within. Here the authors provide evidence that curaxins affect the spatial genome organization and compromise enhancer-promoter communication necessary for expression of several oncogenes, including MYC.
- Omar L. Kantidze
- , Artem V. Luzhin
- & Sergey V. Razin
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| Open AccessGenome maps across 26 human populations reveal population-specific patterns of structural variation
Large structural variants (SV) are understudied in human genetics research because of the difficulty to detect them in the routinely generated short-read sequencing data. Here, the authors generate optical genome maps of 154 individuals from 26 populations that allow comprehensive examination of large SVs.
- Michal Levy-Sakin
- , Steven Pastor
- & Pui-Yan Kwok
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| Open AccessBiological relevance of computationally predicted pathogenicity of noncoding variants
Researchers can make use of a variety of computational tools to prioritize genetic variants and predict their pathogenicity. Here, the authors evaluate the performance of six of these tools in three typical biological tasks and find generally low concordance of predictions and experimental confirmation.
- Li Liu
- , Maxwell D. Sanderford
- & Sudhir Kumar
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| Open AccessChromosome-level assembly of the water buffalo genome surpasses human and goat genomes in sequence contiguity
Despite technological advances, chromosome-level assemblies of mammalian genomes are still rare. Here, the authors use PacBio, Chicago and Hi-C approaches to generate a highly contiguous and partially-phased genome assembly for the water buffalo, Bubalus bubalis
- Wai Yee Low
- , Rick Tearle
- & John L. Williams
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| Open AccessRetrotranspositional landscape of Asian rice revealed by 3000 genomes
Transposable elements (TE) are the dominant constituent of plant genomes. Here the authors develop a tool to analyze TE insertion sites in 3000 rice genomes and provide evidence for recent TE activity during cultivation and that external, rather than genetic, stimuli trigger most activations.
- Marie-Christine Carpentier
- , Ernandes Manfroi
- & Olivier Panaud
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| Open AccessA chromosome-scale assembly of the sorghum genome using nanopore sequencing and optical mapping
Assembly of large, repeat-rich eukaryotic genomes remains challenging. Here, the authors use BioNano Genomics DLS optical mapping and single-molecule nanopore sequencing to generate a chromosome-scale assembly of a new Sorghum bicolor accession and identify variation compared to the publicly available S. bicolor genome.
- Stéphane Deschamps
- , Yun Zhang
- & Haining Lin
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| Open AccessA reference haplotype panel for genome-wide imputation of short tandem repeats
Short-tandem repeats (STR), similar to single nucleotide polymorphisms (SNP), contribute to complex traits, but their ascertainment by next-generation sequencing is costly. Here, Saini et al. provide a SNP+STR haplotype reference panel that allows imputation of STRs from SNP array data.
- Shubham Saini
- , Ileena Mitra
- & Melissa Gymrek
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| Open AccessRepurposing of promoters and enhancers during mammalian evolution
Enhancers and promoters are different types of regulatory elements with shared architectural and functional features. Here the authors perform integrated cross-mammalian analyses of DNase hypersensitivity, chromatin modification and transcriptional data, to provide evidence of regulatory repurposing during evolution.
- Francesco N. Carelli
- , Angélica Liechti
- & Henrik Kaessmann
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| Open AccessRepeated inversions within a pannier intron drive diversification of intraspecific colour patterns of ladybird beetles
The harlequin ladybird beetle, Harmonia axyridis, has remarkable phenotypic diversity, with over 200 colour patterns. Here, Ando et al. show that this patterning is regulated by the transcription factor gene pannier and has diversified by repeated inversions and cis-regulatory modifications of pannier.
- Toshiya Ando
- , Takeshi Matsuda
- & Teruyuki Niimi
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| Open AccessDeep-coverage whole genome sequences and blood lipids among 16,324 individuals
Common genetic variants associated with plasma lipids have been extensively studied for a better understanding of common diseases. Here, the authors use whole-genome sequencing of 16,324 individuals to analyze rare variant associations and to determine their monogenic and polygenic contribution to lipid traits.
- Pradeep Natarajan
- , Gina M. Peloso
- & Sebastian Zoellner
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| Open AccessBiology and genome of a newly discovered sibling species of Caenorhabditis elegans
Caenorhabditis nematodes are important model organisms. Here, the authors report the biology and genome of Caenorhabditis inopinata, a first sibling species of C. elegans, and develop genetic and molecular techniques for C. inopinata.
- Natsumi Kanzaki
- , Isheng J. Tsai
- & Taisei Kikuchi
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| Open AccessDe novo human genome assemblies reveal spectrum of alternative haplotypes in diverse populations
The majority of the human reference genome assembly is represented as a single consensus haplotype. Here, Wong et al. analyze de novo assemblies of 17 diverse, haplotype-resolved genomes to gain insights into the structure of genetic diversity and compile a list of alternative haplotypes across populations.
- Karen H. Y. Wong
- , Michal Levy-Sakin
- & Pui-Yan Kwok
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| Open AccessA mosaic monoploid reference sequence for the highly complex genome of sugarcane
Sugarcane (Saccharum spp.) is a crop of major economic significance but has complex genome structure. Here, the authors generate a BAC-based monoploid sugarcane reference sequence.
- Olivier Garsmeur
- , Gaetan Droc
- & Angélique D’Hont
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Article
| Open AccessPromoter interactome of human embryonic stem cell-derived cardiomyocytes connects GWAS regions to cardiac gene networks
Human embryonic stem cell-derived cardiomyocytes (hESC-CM) are a widely used model to study cardiac genomics. Here, Choy et al. perform promoter capture Hi-C to map long-range chromosomal interactions of hESC-CMs and to study overlap of such regions with genetic loci associated with cardiac phenotypes.
- Mun-Kit Choy
- , Biola M. Javierre
- & Bernard D. Keavney
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Article
| Open AccessLarge-scale genetic analysis reveals mammalian mtDNA heteroplasmy dynamics and variance increase through lifetimes and generations
Mitochondrial populations in cells may consist of heteroplasmic mixtures of mtDNA types, and their evolution through development, aging and generations is central to genetic diseases. Here the authors dissect these population dynamics using a large mouse-based data set to characterise the dynamics of heteroplasmy mean and variance throughout life and across generations.
- Joerg P. Burgstaller
- , Thomas Kolbe
- & Iain G. Johnston
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| Open AccessWhole-genome resequencing reveals world-wide ancestry and adaptive introgression events of domesticated cattle in East Asia
There are various indigenous cattle breeds in East Asia which have a complex history. Here, the authors analyse the genomes of 49 modern breeds and eight ancient samples and identify three distinct ancestries and multiple adaptive introgressions from other bovine species.
- Ningbo Chen
- , Yudong Cai
- & Chuzhao Lei
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Article
| Open AccessAnalysis of predicted loss-of-function variants in UK Biobank identifies variants protective for disease
Examination of predicted loss-of-function (pLOF) genetic variants allows direct identification of genes with therapeutic potential. Here, Emdin et al. perform association analysis for 3759 pLOF variants with 24 traits and highlight protective variants against cardiometabolic and immune phenotypes.
- Connor A. Emdin
- , Amit V. Khera
- & Sekar Kathiresan
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| Open AccessMedical relevance of protein-truncating variants across 337,205 individuals in the UK Biobank study
Protein-truncating variants (PTVs) are predicted to significantly affect a gene’s function and, thus, human traits. Here, DeBoever et al. systematically analyze PTVs in more than 300,000 individuals across 135 phenotypes and identify 27 associations between PTVs and medical conditions.
- Christopher DeBoever
- , Yosuke Tanigawa
- & Manuel A. Rivas
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| Open AccessThe Gastrodia elata genome provides insights into plant adaptation to heterotrophy
Gastrodia elata is an obligate mycoheterotrophic plant with highly reduced leaves and bracts in scape. Here, Yuan et al sequence and analyze its 1.06 Gb genome which provides insights in adaptation to a lifestyle of heterotrophy.
- Yuan Yuan
- , Xiaohua Jin
- & Luqi Huang
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| Open AccessIdentification of rare sequence variation underlying heritable pulmonary arterial hypertension
Pulmonary arterial hypertension (PAH) is a rare lung disorder characterised by narrowing and obliteration of small pulmonary arteries ultimately leading to right heart failure. Here, the authors sequence whole genomes of over 1000 PAH patients and identify likely causal variants in GDF2, ATP13A3, AQP1 and SOX17.
- Stefan Gräf
- , Matthias Haimel
- & Nicholas W. Morrell
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| Open AccessCircular DNA elements of chromosomal origin are common in healthy human somatic tissue
Somatic cells can accumulate structural variations such as deletions. Here, Møller et al. show that normal human cells generate large extrachromosomal circular DNAs (eccDNAs), most likely the products of excised DNA, that can be transcriptionally active and, thus, may have phenotypic consequences.
- Henrik Devitt Møller
- , Marghoob Mohiyuddin
- & Birgitte Regenberg
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| Open AccessDiscovery of coding regions in the human genome by integrated proteogenomics analysis workflow
Proteogenomics enables the discovery of protein coding regions and disease-relevant mutations but their verification remains challenging. Here, the authors combine peptide discovery, curation and validation in an integrated proteogenomics workflow, robustly identifying unknown coding regions and mutations.
- Yafeng Zhu
- , Lukas M. Orre
- & Janne Lehtiö
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| Open AccessHigh-resolution TADs reveal DNA sequences underlying genome organization in flies
Although topologically associating domains (TADs) have been extensively investigated, it is not clear to what extent DNA sequence contributes to their formation. Here the authors develop software to identify high-resolution TAD boundaries and reveal their relationship to underlying DNA motifs.
- Fidel Ramírez
- , Vivek Bhardwaj
- & Thomas Manke