Genetically identical armadillo quadruplets develop unique, lifelong immune system fingerprints despite being clones.
April 1, 2026
Original Paper
Monocyte Lineage Expansion Drives Transcriptomic Individuality in Genetically Identical Armadillo Quadruplets
bioRxiv · 10.64898/2026.03.30.715171
The Takeaway
Using the only mammal that naturally gives birth to identical quadruplets, scientists found that 'clones' aren't actually biological copies. Early random events in the womb lead to permanent differences in immune cell composition and gene activity that persist even through infections.
From the abstract
Genetic diversity shapes phenotypes, yet even genetically identical individuals differ. In nine-banded armadillo (Dasypus novemcinctus) quadruplets, we previously showed that allele-specific expression (ASE) imbalances provide a stable molecular fingerprint of individuality. Here, we test whether such transcriptomic individuality reflects functional biological differences. We profiled bulk blood RNA from five cohorts of genetically identical quadruplets across three time points, and found persis