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Researchers have recently identified significant issues regarding spatial transcriptomics accuracy. Specifically, their latest study explores how off-target probe binding affects 10x Genomics Xenium gene panels. Because these probes sometimes attach to unintended genes, they create misleading expression data. Consequently, this binding distorts the true biological profile of the analyzed tissue. Therefore, scientists must verify probe specificity to ensure reliable results in high-resolution studies.
Furthermore, the research team created a new software tool called the Off-target Probe Tracker (OPT). Moreover, this software aligns probe sequences against multiple reference annotations to find potential errors. Subsequently, the researchers tested a human breast cancer gene panel using this tool. Although the panel contained 313 genes, they found that at least 14 were potentially impacted. In addition, they used orthogonal spatial and single-cell data to substantiate these findings. However, the Xenium profiles often reflected an aggregate of multiple genes instead of the target alone. Thus, maintaining spatial transcriptomics accuracy remains a critical factor for clinical researchers. Finally, this work provides a path toward better reproducibility and data interpretation in the field of genomics.
Off-target binding occurs when a molecular probe attaches to a gene sequence other than its intended target, often due to sequence similarities between different genes.
The Off-target Probe Tracker (OPT) identifies probes that might misbind. This allows researchers to filter or correct data, thereby ensuring the results reflect the intended gene expression.
Disclaimer: This content is for informational and educational purposes only. It is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Refer to the latest local and national guidelines for clinical practice.
References
Hallinan C et al. Evidence of off-target probe binding affecting 10x Genomics Xenium gene panels compromise accuracy of spatial transcriptomic profiling. Elife. 2026 May 01. doi: undefined. PMID: 42065925.
Janesick A, et al. High-resolution spatial profiling of the breast cancer tumor microenvironment. Nat Commun. 2023;14(1):6973.
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