pastForward: a Snakemake pipeline for ancient and historical DNA with eukaryote-wide taxonomic screening and tracking of copy-number vari…

Verdict. Therefore, we developed pastForward, a fully automated Snakemake pipeline that integrates all analysis steps from raw reads to damage-rescaled BAM files in a single reproducible workflow. It intersects mitochondrial stress/dysfunction themes (organelle damage).

What the authors report

Ancient and historical DNA has the potential to resolve many open questions in biology. While pipelines for processing ancient and historical DNA exist, none combine user-friendly, configurable processing with copy number variation tracking and targeted taxonomic profiling.

Key results stated in the abstract include the following. Therefore, we developed pastForward, a fully automated Snakemake pipeline that integrates all analysis steps from raw reads to damage-rescaled BAM files in a single reproducible workflow. It performs ancient and historical DNA processing, including adapter trimming, read merging, deduplication, damage assessment, quality rescaling, and generates interactive reports summarizing the endogenous read content, library complexity, and breadth and depth coverage statistics. REVEAL (Read-based Estimation and visualization of Element Abundance and Loci) quantifies and visualizes copy number variation of genetic features, such as transposable elements (TEs) or gene duplications.

Why it matters for mitochondrial biology

Within mitochondrial research, this work maps primarily to OXPHOS. It is relevant to mitochondrial dysfunction discourse because the abstract invokes organelle damage. That does not by itself establish a validated disease mechanism; it indicates thematic proximity. OXPHOS/ETC involvement, if confirmed, would place the work in the core of bioenergetic pathophysiology rather than peripheral organelle biology. Server: biorxiv. Posted 2026-08-13. Synthesis confidence is bounded by abstract completeness.

Study design (abstract-level)

These reports allow users to rapidly assess the quality of sequencing data. Mapping to multiple reference sequences is supported, facilitating co-analysis of host and endosymbiont sequences and genotyping of marker genes such as COI. pastForward further integrates two novel tools. ECMSD (Efficient Comprehensive Mitochondrial Sequence Detector) screens each library for eukaryotic DNA by aligning reads against a mitochondrial reference database.

Principal findings

1. Therefore, we developed pastForward, a fully automated Snakemake pipeline that integrates all analysis steps from raw reads to damage-rescaled BAM files in a single reproducible workflow.
2. It performs ancient and historical DNA processing, including adapter trimming, read merging, deduplication, damage assessment, quality rescaling, and generates interactive reports summarizing the endogenous read content, library complexity, and breadth and depth coverage statistics.
3. REVEAL (Read-based Estimation and visualization of Element Abundance and Loci) quantifies and visualizes copy number variation of genetic features, such as transposable elements (TEs) or gene duplications.
4. Using pastForward on dog genomic time series, including Neolithic samples, we confirm that the copy number of AMY2B, which encodes the starch-digesting enzyme amylase, increased during domestication.
5. From historical D. melanogaster genomes, we recover the recent invasion of the transposable element opus .

Limitations of this brief

• This Mitos brief is an abstract-level synthesis of a preprint; it is not peer review and not a substitute for reading the full paper.
• Preprint status: findings may change with revision or journal review.
• Effect sizes, n numbers, statistics, and full experimental controls are typically incomplete at abstract resolution.
• Comparator/control language is weak or absent in the abstract, limiting causal inference from this brief alone.
• Primary source: biorxiv DOI 10.64898/2026.08.07.743613 (posted 2026-08-13).

Open scientific questions

• Which specific experimental panels in the full paper establish the strongest causal claim, and how robust are the controls?
• Are OXPHOS defects primary drivers or secondary consequences of broader cellular stress?
• How do these findings sit relative to prior literature on the same pathway—replication, contradiction, or incremental extension?

Bottom line

For mitochondrial biologists focused on OXPHOS, this preprint is worth full-text review if the topic matches your program. Abstract-level takeaway: Therefore, we developed pastForward, a fully automated Snakemake pipeline that integrates all analysis steps from raw reads to damage-rescaled BAM files in a single reproducible workflow. Confirm methods, effect sizes, and controls in the full PDF before citing the result as established.

Bibliographic record

Abstract-based editorial synthesis by Mitos. Not peer review.