Tandem Duplicate Genes in Maize Are Abundant and Date to Two Distinct Periods of Time

G3 : Genes - Genomes - Genetics
Thomas J Y KonoCandice N Hirsch

Abstract

Tandem duplicate genes are proximally duplicated and as such occur in similar genomic neighborhoods. Using the maize B73 and PH207 de novo genome assemblies, we identified thousands of tandem gene duplicates that account for ∼10% of the annotated genes. These tandem duplicates have a bimodal distribution of ages, which coincide with ancient allopolyploidization and more recent domestication. Tandem duplicates are smaller on average and have a higher probability of containing LTR elements than other genes, suggesting origins in nonhomologous recombination. Within relatively recent tandem duplicate genes, ∼26% appear to be undergoing degeneration or divergence in function from the ancestral copy. Our results show that tandem duplicates are abundant in maize, arose in bursts throughout maize evolutionary history under multiple potential mechanisms, and may provide a substrate for novel phenotypic variation.

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Software Mentioned

PAML
RAxML
MLHKA
codeml
clustal
Ensembl
omega
OrthoFinder
R
SynMap

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