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## Description
-Single-cell RNA sequencing (scRNA-seq) is a well-established technique in the era of next-generation sequencing. From identifying novel cell types, characterizing responses to treatment, or mapping cell type-specific eQTLs, its widespread applications are undeniably valuable to the field of molecular and cell biology. However, the reliability of all downstream scRNA-seq applications is entirely dependent on upstream pre-processing, with cell-level quality control being an important component.
+Single-cell RNA sequencing (scRNA-seq) is a well-established technique in the era of next-generation sequencing. From identifying novel cell types, characterizing responses to treatment, or mapping cell type-specific eQTLs, its widespread applications are undeniably valuable to the field of molecular and cell biology. However, the reliability of all downstream scRNA-seq applications depends on the quality of upstream pre-processing, with cell-level filtering being an important component.
For droplet-based protocols, ‘low quality’ cells are those that originate from droplets that contain more than one cell (doublet), no cells (empty), or a damaged cell. While scRNA-seq quality control tools are available to identify doublets and empty droplets, few are specialised in identifing damaged cells. Damaged cell detection is more often achieved by setting thresholds for metrics such as average mitochondrial gene expression or UMI and features counts per barcode. These thresholds, even when dynamically calculated, vary across samples, cell types, tissues, treatment conditions, and species. This could result in overly stringent filtering, where many true cells are excluded from downstream analysis, or, in overly conservative filtering, where many contaminating damaged cells remain. But searching for true damaged droplets in a sample-specific manner is tedious and not always intuitive, leading to user-defined filtering that lacks reproducibility.