Abstract
Animal mitochondria are usually inherited through the maternal lineage. The exceptional system allowing fathers to transmit their mitochondria to the offspring exists in some bivalves. Its taxonomic spread is poorly understood and new mitogenomic data are needed to fill the gap. Here, we present for the first time the two divergent mitogenomes from Chilean mussel Perumytilus purpuratus. The existence of these sex-specific mitogenomes confirms that this species has the doubly uniparental inheritance (DUI) of mitochondria. The genetic distance between the two mitochondrial lineages in P. purpuratus is not only much bigger than in the Mytilus edulis species complex but also greater than the distance observed in Musculista senhousia, the only other DUI-positive member of the Mytilidae family for which both complete mitochondrial genomes were published to date. One additional, long ORF (open reading frame) is present exclusively in the maternal mitogenome of P. purpuratus. This ORF evolves under purifying selection, and will likely be a target for future DUI research.
Highlights
The marine mussel Perumytilus purpuratus (Lamarck, 1819), an endemic species belonging to the Mytilidae family, forms extensive banks in the mid-intertidal rocky shores of the south-west coasts of South America (Guinez & Castilla, 1999)
Complete F mitogenomes of P. purpuratus sampled from northern and south-eastern populations are similar in length (16,963 bp and 16,986 bp respectively) and have the same gene content and order
The maps of mitogenomes from LCP1 are identical. Both M and F mitogenomes include a set of genes typical for a metazoan mitogenome (Avise, 1986): 13 parts of OXPHOS machinery, two subunits of mitochondrial ribosomal RNA and 22 tRNAs needed to express them
Summary
The marine mussel Perumytilus purpuratus (Lamarck, 1819), an endemic species belonging to the Mytilidae family, forms extensive banks in the mid-intertidal rocky shores of the south-west coasts of South America (Guinez & Castilla, 1999). This species is known from intense intraspecific competition within multi-stratified matrices of individuals (Guiñez, 2005; Acevedo, Orellana & Guiñez, 2010). This, together with Pleistocene separation of Atlantic and Pacific populations, led to the relatively deep and well-defined contemporary split of the species into two populations: south-eastern and northern, with a clear genetic discontinuity close to the 40◦ S latitude in the Pacific (Trovant et al, 2015; Guiñez et al, 2016). It has been suggested, based on the anatomy of sperm, that these two populations may even represent two separate species (Briones et al, 2012)
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