Xian Chang

@xian-chang.bsky.social

Bioinformatics postdoc at INRAE in Toulouse, France. Working on data structures and algorithms for pangenome graphs

We built the first complete genome for the common marmoset, fully resolving regions that were previously missing: centromeres, acrocentric short arms, and more. A new reference genome for anyone working with marmosets. This was an awesome collaborative effort & I’m grateful to all my co-authors! 🧬

bioRxiv Genomics@biorxiv-genomic.bsky.social · 7mo ago

A Complete Genome for the Common Marmoset https://www.biorxiv.org/content/10.64898/2026.03.25.713844v1

I've added 7 videos to my Burrows-Wheeler indexing playlist (www.youtube.com/playlist?lis...), rounding out the r-index series and adding a 5-part series on the move structure. Now 27 videos in that playlist. I aim to add videos on prefix-free parsing, PBWT, Wheeler languages/automata in the future.

Burrows-Wheeler Indexing - YouTube

Videos on : (a) the Burrows-Wheeler Transform (BWT), (b) the FM Index, which uses the BWT to construct a full-text index, (c) Wheeler graphs, (d) r-index, an...

youtube.com

We use personalized references with our Giraffe aligner. Each chromosome is partitioned into a sequence of blocks. We sample the most relevant haplotypes in each block using kmer counts. Mapping to this personalized reference improves variant calling accuracy. www.nature.com/articles/s41...

Personalized pangenome references - Nature Methods

This work introduces a k-mer-based approach to customizing a pangenome reference, making it more relevant to a new sample of interest. This method enhances the accuracy of genotyping small variants an...

nature.com