Forensic genetics has long relied on a workhorse technology that, despite decades of refinement, has always had a fundamental blind spot. Capillary electrophoresis, the gold-standard method for reading short tandem repeats—the repetitive DNA sequences that underpin nearly every criminal investigation and paternity case—can only measure how long a DNA fragment is, not what its actual sequence says. Two alleles that are identical in length but different in internal sequence look exactly the same to the instrument. And the number of markers that can be typed simultaneously in a single reaction is constrained by the physics of fluorescent dye detection. A team of researchers at Shanxi Medical University in Taiyuan, China, has now addressed both limitations at once, developing and validating a massively parallel sequencing panel that amplifies 154 short tandem repeat loci in a single reaction and works on two very different sequencing platforms, including a portable nanopore device suited to field-deployable workflows.
The new panel, described in BMC Genomics, comprises 66 autosomal loci, 57 markers on the Y chromosome, and 31 on the X chromosome, all amplified together in one multiplex polymerase chain reaction and read by massively parallel sequencing. That combination is significant for practical forensic work. Autosomal short tandem repeats are the backbone of individual identification; Y-chromosomal markers trace paternal lineages and are invaluable in sexual assault cases where male and female DNA are mixed; and X-chromosomal markers add resolving power for complex kinship questions, particularly in cases involving female relatives where standard markers perform poorly. Existing commercial kits typically cover a few dozen loci from one chromosome category at a time. Pulling all three classes into a single 154-plex reaction means a laboratory can extract far more information from a scarce and often degraded crime scene sample without consuming additional DNA.
The validation study followed the rigorous testing conventions that forensic science demands before any method can be adopted in casework. The researchers evaluated the panel using standard reference DNA, samples from 110 unrelated individuals, and a set of non-human control samples to confirm species specificity. Sensitivity testing showed that complete short tandem repeat profiles could be obtained from as little as 0.5 nanograms of template DNA, and even at 0.125 nanograms—well below what many crime scene samples provide—locus detection rates remained above 94 percent. In mixture experiments designed to simulate real-world evidence such as touch DNA on a garment handled by multiple people, alleles from minor contributors remained detectable at a contributor ratio of 1:9, a level of mixture tolerance that meets or exceeds many current commercial systems.
Degradation and inhibition are the twin enemies of forensic DNA analysis. Samples exposed to heat, humidity, UV light, or soil chemistry break DNA into fragments too short for traditional amplification, while inhibitors such as hemoglobin, indigo, or humic acid can derail the polymerase chain reaction entirely. The panel’s detection rates exceeded 90 percent under moderate DNA degradation, and, critically, the shorter amplicons included in the design showed greater resistance to breakdown than longer ones—an intentional design choice that mirrors the mini-STR strategy long used to salvage degraded evidence. The panel also tolerated the polymerase chain reaction inhibitors tested, although performance varied with inhibitor type and concentration, a nuance the authors note matters for laboratory interpretation guidelines.
Species specificity was confirmed by the absence of any reportable profiles from the non-human samples tested, ruling out spurious amplification from animal contamination—a real concern for evidence recovered outdoors. Concordance with the existing gold standard was assessed by comparing length-based calls at loci shared with capillary electrophoresis typing, where the panel achieved 97.66 percent agreement. Discordances at such loci are expected and well understood in the field: massively parallel sequencing can reveal sequence variants inside the repeat region or its flanking sequences that cause the polymerase chain reaction product to shift slightly in size, or that cause alleles to drop out differently, and these apparent discrepancies often represent the new method seeing more detail than the old one could.
That added detail is precisely where the technology delivers its headline advantage. By reading the actual sequence of each repeat, the panel identified additional allelic variation invisible to capillary electrophoresis, including single-nucleotide polymorphisms in the flanking regions of the repeats. This means alleles that are identical in length—and therefore indistinguishable by the traditional method—can now be separated by their internal sequence, increasing the discrimination power of the system. For kinship analysis, the gains are equally concrete. Likelihood ratio simulations showed improved resolution of second- and third-degree relationships using the panel’s 66 autosomal markers compared with the 20 CODIS core loci that form the backbone of the United States national DNA database. Because distant relatives share fewer identical-by-descent alleles, distinguishing a grandparent from an uncle, or a half-sibling from a first cousin, requires many more independent markers than identifying an individual from a database match. A panel that triples the autosomal marker count while remaining compatible with existing length-based databases— Laboratories can continue comparing results against legacy records—stands to transform kinship testing in disaster victim identification, immigration cases, and historical investigations.
Population genetic analysis across the sampled cohort demonstrated high discriminatory power across all three marker sets, confirming that the autosomal, Y-chromosomal, and X-chromosomal panels each contribute meaningful independent information. The ethical and technical groundwork for population databases built on sequence-level data is still being laid worldwide, and studies like this one provide the allele frequency data that future statistical interpretation will require. The authors note that the panel retains compatibility with existing length-based databases, an important bridge that prevents the new technology from orphaning decades of accumulated forensic records.
Perhaps the most forward-looking element of the study is the preliminary evaluation on the Oxford Nanopore Technologies platform. Most massively parallel sequencing in forensic laboratories today runs on Illumina instruments—benchtop machines that require stable power, climate control, and substantial infrastructure. Nanopore sequencers, by contrast, are pocket-sized devices that read DNA by detecting electrical signals as strands pass through protein pores, and they can in principle deliver results in hours from a laptop in a mobile laboratory. The researchers demonstrated concordant performance of the panel on the Nanopore platform, opening the door to rapid, portable forensic workflows: profiling DNA at disaster sites, at border checkpoints, or in field hospitals without shipping samples back to a central facility. The authors are careful to frame the Nanopore results as preliminary, but the demonstration that a single multiplex panel performs concordantly across both platforms gives laboratories a choice of infrastructure rather than a lock-in.
The work, led by Mengyang Zhao, Tingting Yang, Linyu Shi, Jing Chen, Jingjing Xu, Yuntian Xiao, Haoliang Fan, and Jiangwei Yan of the School of Forensic Medicine at Shanxi Medical University, was supported by the National Natural Science Foundation of China. The study was approved by the university’s ethics committee, and all participants provided written informed consent. The panel’s design, validation data, and population statistics are being shared openly, as the article is published under open access terms.
What emerges from the study is a picture of forensic DNA analysis at an inflection point. For thirty years, the field has optimized a length-measurement technology, and the resulting databases have solved millions of cases. Sequence-based typing does not discard that legacy; it builds on it, layering additional resolution on top of familiar markers and extending coverage across all three chromosome classes relevant to casework. With sensitivity down to a fraction of a nanogram, tolerance for degraded and inhibited samples, mixture resolution to one part in ten, kinship power adequate for distant relatives, and a portable sequencing route to the field, the 154-plex panel illustrates how massively parallel sequencing may move from specialist curiosity to everyday forensic tool—capable of extracting more identity, more lineage, and more relationship information from less DNA than ever before.
Subject of Research: Development and forensic validation of a 154-plex massively parallel sequencing short tandem repeat panel compatible with Illumina and Oxford Nanopore platforms
Subject of Research: Biology
Article Title: Development and validation of a 154-plex MPS STR panel for Illumina and Nanopore: a comprehensive tool for forensic genetic analysis
Article References: Zhao, M., Yang, T., Shi, L., Chen, J., Xu, J., Xiao, Y., Fan, H., & Yan, J. (2026). Development and validation of a 154-plex MPS STR panel for Illumina and Nanopore: a comprehensive tool for forensic genetic analysis. BMC Genomics. https://doi.org/10.1186/s12864-026-13280-y
Image Credits: AI Generated
DOI: 10.1186/s12864-026-13280-y
Keywords: Short tandem repeat (STR), Massively parallel sequencing (MPS), Forensic validation, Nanopore sequencing, Sequence-based polymorphism, Illumina, DNA degradation, Mixture analysis, Kinship analysis, X-chromosomal STR, Y-chromosomal STR, Forensic genetics
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Juliet Wilcox. (September 9, 2026). New 154-plex STR sequencing panel enables comprehensive forensic genetic analysis. Scienmag. https://scienmag.com/new-154-plex-str-sequencing-panel-enables-comprehensive-forensic-genetic-analysis/
Juliet Wilcox. “New 154-plex STR sequencing panel enables comprehensive forensic genetic analysis.” Scienmag, 9 September 2026, https://scienmag.com/new-154-plex-str-sequencing-panel-enables-comprehensive-forensic-genetic-analysis/. Accessed 9 September 2026.
Juliet Wilcox. “New 154-plex STR sequencing panel enables comprehensive forensic genetic analysis.” Scienmag. September 9, 2026. https://scienmag.com/new-154-plex-str-sequencing-panel-enables-comprehensive-forensic-genetic-analysis/
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Tags: 154-plex STR sequencing paneladvancements in forensic DNA technologyadvances in forensic genetic technologycomprehensive forensic DNA profilingcomprehensive genetic profiling for criminal investigationsfield-deployable forensic sequencing methodsfield-deployable forensic sequencing toolsforensic DNA marker multiplexingforensic genetic analysisforensic geneticshigh-throughput forensic genetic testinginternal sequence variation in STR alleleslimitations of capillary electrophoresislimitations of capillary electrophoresis in DNA analysismassively parallel sequencing in forensicsmultiplex PCR for forensic markersportable nanopore sequencing for forensic analysisportable nanopore sequencing for forensicssequencing of short tandem repeatsshort tandem repeats (STR) analysisY and X chromosome STR markersY chromosome and X chromosome markers
