Scientific publications

Long-read whole-genome sequencing (LR-WGS) technologies enhance the discovery of structural variants (SVs) and tandem repeats (TRs). We performed LR-WGS on 267 individuals from 63 autism spectrum disorder (ASD) families and generated an integrated call set combining long- and short-read data. LR-WGS increased detection of gene-disrupting SVs and TRs by 33% and 38%, respectively, and enabled identification of novel exonic de novo germline and somatic SVs. We observed complex SV patterns, including a class of nested duplication-deletion events. By joint analysis of phased genetic variation and DNA methylation, we identified deletions of imprinted genes and demonstrated the effect of intermediate TR expansions (35–54 CGG) on the methylation of FMR1 promoter. Rare SVs, TRs, and damaging SNVs together accounted for 7.4% (95% confidence interval [CI], 2.7%–17%) of the heritability of ASD. These findings demonstrate how LR-WGS can resolve complex genetic variation and its functional consequences and regulatory effects in a single assay.

We address the advances in our understanding of the complex genetic architecture of ALS, including the varying models of genetic contribution to disease, and the importance of understanding population genetics and genetic testing when considering patient selection for clinical studies. Additionally, we discuss the advances in long-read whole-genome sequencing technology and how this method can improve streamlined genetic testing and our understanding of the genetic heterogeneity in ALS.

Oncogenesis involves widespread genetic and epigenetic alterations, yet the full spectrum of somatic variation genome-wide remains unresolved. These findings define the full landscape of a cancer’s somatic variation and their functional impact, establishing a blueprint for T2T studies of mosaicism.

This work provides new insight into the extensive molecular variation underlying FXTAS in human brain and establishes a framework for studying repeat expansion disorders more broadly, highlighting the potential of long-read sequencing to advance our fundamental understanding of somatic mosaicism of these intractable regions of our genome.

The All of Us Research Program (AoU) is a national biobank seeking to enroll one million individuals in the United States to link genomic and biomedical data, including short- and long-read whole-genome sequencing (srWGS/LRS), with rich electronic health record (EHR) information. Here, we present the first large-scale analyses of long-read sequencing (LRS) in AoU and offer a new framework for deriving genomic insights into complex structural variation (SV) of relevance to human health and disease.

This landmark study demonstrates how HiFi sequencing can transform pediatric disease discovery by delivering 10% higher success over all prior testing methods, helping to provide families with results in <1 month vs. 3, and reducing the need for multiple stressful and costly rounds of testing.

Alle-specific methylation is often underappreciated but plays a crucial role in understanding what drives development and disease. Short reads miss most of this signal (up to 60%), proving methylation isn’t just extra data, it’s essential for discovery. With HiFi, you get it automatically with every genome.

This study shows the power of combining HiFi long-read sequencing with single-cell resolution to map isoform usage in human CD8⁺ T cells. By capturing dynamic splicing programs that short-read methods often miss, the team not only redefined T cell states, but also uncovered novel immune checkpoints with therapeutic potential. This work lays the foundation for isoform-selective immunotherapies that are anchored in discovery, validated in vivo, and guided by a generalizable single-cell framework.

The Iso-seq method doubled the number of isoforms detected compared to short-read RNA-seq, revealing splicing events with direct relevance to cancer immunotherapy. The authors note that long-read RNA sequencing “may hold the key to breakthroughs that lead to the next wave of therapeutic advances.” With current workflows using Kinnex kits and the Revio system, such insights can now be achieved at scale and reduced cost, requiring only half a SMRT Cell to generate equivalent data compared to 12 SMRT Cells in the study.

Finding these rare variants matters. Many aren’t included on standard screening panels, which means families could miss crucial information about their health and risk of developing diseases like thalassemia. By uncovering what other technologies miss, PacBio sequencing can help empower answers for families in high-risk regions.

HiFi sequencing revealed the complex repeat expansion structure driving disease that were missed by conventional testing. The study highlights the value of long-read sequencing for repeat expansion disorders, as well as the ability of TRGT-instability to detect mosaicism at single-molecule resolution. On Revio and Vega, HiFi WGS combined with TRGT tools provides researchers and clinicians with a powerful framework for understanding difficult repeat-associated conditions.

Because HiFi sequencing interrogates the entire genome, it also delivers a more complete view of the epigenome, capturing millions of additional CpG sites and enabling de novo methylation analysis without chemical conversions or extra workflows. With 5-base sequencing available directly on Revio and Vega, researchers can integrate methylation profiling into every run as part of standard HiFi data.

This work demonstrates how ultralow-input HiFi sequencing expands access to clinically relevant samples, enabling comprehensive variant detection even when DNA is limited. The protocol has since been refined into the Ampli-Fi protocol, which reduces input requirements further to just 1 ng. Combined with flexible library prep on Revio and Vega systems, HiFi sequencing now offers exceptional versatility while maintaining its hallmark accuracy and completeness.

Pangenomes provide a robust and comprehensive portrayal of genetic diversity in humans, but Arab populations remain underrepresented. We present a preliminary UAE-based Arab Pangenome Reference (UPR) utilizing 53 individuals of diverse Arab ethnicities residing in the United Arab Emirates. We assembled nuclear and mitochondrial pangenomes using 35.27X high-fidelity long reads, 54.22X ultralong reads and 65.46X Hi-C reads. This approach yielded contiguous haplotype-phased de novo assemblies of exceptional quality, with an average N50 of 124.28 Mb. We discovered 111.96 million base pairs of previously uncharacterized euchromatic sequences absent from existing human pangenomes, the T2T-CHM13 and GRCh38 reference human genomes, and other public datasets. Moreover, we identified 8.94 million population-specific small variants and 235,195 structural variants within the Arab pangenome, not present in linear and pangenome references and public datasets. We detected 883 gene duplications, including the TATA-binding protein gene TAF11L5, which was uniquely duplicated across all Arab populations and that included 15.06% of genes associated with recessive diseases. By exploring the mitochondrial pangenome, we identified 1,436 bp of previously unreported sequences. Our study provides a valuable resource for future genetic research and genomic medicine initiatives in Arab population and other population with similar genetic backgrounds.

Long-read whole genome sequencing (LR-WGS) technologies enhance the discovery of structural variants (SVs) and tandem repeats (TRs). Application of LR-WGS has potential to identify novel risk factors that contribute to autism spectrum disorder (ASD). We performed LR-WGS on 243 individuals from 63 ASD families and generated an integrated call set combining long- and short-read data. LR-WGS increased detection of gene-disrupting SVs and TRs by 29% and 38%, respectively, and enabled identification of novel exonic de novo germline and somatic SVs that were not detected previously with short read WGS. We observed complex SV patterns, including a previously undescribed class of nested duplication-deletion (DUP-DEL) events. Joint analysis of phased TRs and methylation data revealed that hypermethylation of expanded FMR1 alleles (≥35 CGG repeats) in females occurs independently of X chromosome inactivation. Rare SVs, TRs, and damaging SNVs together accounted for 6.2% (95% CI: 1.7–15%) of the heritability of ASD in this sample. These findings demonstrate how LR-WGS can resolve complex genetic variation and its functional consequences and regulatory effects in a single assay.