Mitrastemonaceae Super-Panplastome: Genome Reduction and Stability

Mitrastemonaceae plastid genomes are highly minimized to 18–26 kb with extreme AT content exceeding 77% and loss of the typical quadripartite architecture. Despite this reduction, the super-panplastome shows remarkable structural stability and collinearity across individuals, with a conserved set of 26 genes. This dataset provides a genomic framework for studying plastid evolution in endoparasitic plants, including evolutionary rate analyses (dN/dS) and transcriptomic evidence for nuclear-encoded DNA repair genes.

Use Cases

• Analyzing patterns of gene loss and retention in non-photosynthetic plastids based on the identified 26-gene suite.
• Studying nucleotide substitution rates and selective pressures using the provided dN/dS (ω) values for genes like accD and clpP.
• Investigating structural genome stability in the absence of inverted repeats and the typical quadripartite architecture.
• Comparative genomics of holoparasitic lineages to identify convergent losses, such as the MUTS2 surveillance system homologs.

Strengths

• Includes two complete circular plastid genome assemblies, providing a concrete genomic foundation.
• Analyses are based on a super-panplastome perspective, characterizing variation across multiple Mitrastemon individuals.
• Dataset is openly available under a CC-BY-4.0 license, facilitating reuse.

Limitations

• Column names and exact row counts are not specified in the provided metadata, limiting precise understanding of data structure.
• The dataset's size (47,199,068 bytes) is given, but its composition (e.g., sequence files, alignment tables) is not detailed.
• Relies on re-evaluation of all available genomic resources for the genus, which may incorporate data of varying original quality.

Provenance

Source

Leonardo Martin Gatica Soria

Collection Method

Genomic assembly and re-evaluation of available resources for Mitrastemon, combined with transcriptomic analysis.

Freshness

Last updated 2026-03-20.