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The genome refers to all of the genetic material in an organism. It can range from a few million base pairs in microbial cells to several billion base pairs in many eukaryotic organisms. Genome assembly refers to the process of taking the DNA sequencing data and putting it all back together in a correct order to create a close representation of the original genome. This is followed by the identification of functional elements on the newly assembled genome, a process called genome annotation.
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Updated: Apr 18, 2026

Novel Sequence Discovery by Subtractive Genomics
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African Pan Genome Contigs Expose Biologically Relevant Sequence Still Hidden from Human Reference Frameworks.

Rachel Martini1,2, Abdulfatai Tijjani3,4, Kyriaki Founta3,4,5

  • 1Institute of Translational Genomic Medicine, Morehouse School of Medicine, Atlanta, GA.

Biorxiv : the Preprint Server for Biology
|April 17, 2026
PubMed
Summary
This summary is machine-generated.

New African Pan Genome (APG) contigs reveal sequences missing from current human references. These functionally important regions, enriched in African genomes, are crucial for understanding genetic variation and improving precision medicine.

Keywords:
African Pan-genomeancestry-associated genomic variationcentromeric and satellite repeatsnovel transcriptsreference bias

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Area of Science:

  • Genomics
  • Population Genetics
  • Bioinformatics

Background:

  • Human reference genomes are essential for biomedical research but exhibit bias towards European populations.
  • This bias limits the interpretation of genetic variations in underrepresented populations, particularly those of African ancestry.

Purpose of the Study:

  • To characterize African Pan Genome (APG) contigs, totaling 296.5 Mb, to identify genomic regions absent from current reference genomes.
  • To define the sequence and functional landscape of these missing genomic regions.

Main Methods:

  • Characterization of APG contigs using alignment to the telomere-to-telomere (T2T-CHM13) genome and Human Pangenome Reference Consortium (HPRC) assemblies.
  • Analysis of unmapped contigs for sequence characteristics and functional potential.

Main Results:

  • Most APG contigs aligned to T2T-CHM13 and HPRC assemblies, with enrichment in centromeric and satellite repeats, and overlap with 373 genes.
  • Ancestry-associated contig enrichment was observed, particularly within African genomes.
  • 742 contigs remained unmapped, exhibiting nonrepetitive sequences with predicted protein-coding genes, CpG islands, and transcriptional activity.

Conclusions:

  • Functionally relevant genomic sequences, enriched in specific ancestries, are absent from current human reference genomes.
  • These findings have significant implications for interpreting disease variants and advancing precision medicine across diverse populations.