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Comparative genomics of seven nuclear assemblies spanning four Boraginales families reveals a paleopolyploidy landscape and transposon-associated assembly-size variation
Abstract
An integrated comparison of transposable-element landscapes, paleopolyploidy signals and macro-synteny across Boraginales families remains limited. We analysed seven nuclear assemblies from four families spanning an 11.5-fold range in raw analysed assembly size (158.3–1,822.6 Mb). TE content ranged from 13.31% to 76.81% of non-N sequence and was strongly associated with log₁₀ assembly size (R² = 0.937, p<0.001; n = 7). Intact-LTR age profiles differed among lineages, while their ecological and causal implications remain untested. A uniform paranome and self-synteny sensitivity analysis identified anchor-supported, window-stable candidate components in the sampled L. erythrorhizon and P. sempervirens genomes; components in the other five genomes remained descriptive because at least one candidate-classification condition failed. These within-genome results do not establish a shared ancestral WGD in Boraginaceae or precise event dates. Gene-based macro-synteny remained detectable across the four families despite their broad assembly-size range
