Open AccessHighly divergent mitogenomes of Geukensia demissa (Bivalvia, Mytilidae) with extreme AT content
Author(s) -
Lubośny Marek,
Śmietanka Beata,
Przyłucka Aleksandra,
Burzyński Artur
Publication year - 2020
Publication title -
journal of zoological systematics and evolutionary research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.769
H-Index - 50
eISSN - 1439-0469
pISSN - 0947-5745
DOI - 10.1111/jzs.12354
Subject(s) - biology , mytilidae , evolutionary biology , lineage (genetic) , zoology , genetics , bivalvia , gene , mollusca
Abstract Complete sequences of two lineage‐specific mitogenomes from mytilid bivalve Geukensia demissa are reported, confirming the existence of doubly uniparental inheritance system in this species. The reported mitogenomes show extreme sequence divergence; at protein level, it is in the range of 12%–55%, exceeding the highest values known from this family to date. Moreover, these mitogenomes are also extraordinarily AT‐rich (~72%) making them the most compositionally biased mitogenomes from this family. The compositional bias is even more extreme at neutral sites, reaching 80% AT there. Despite high‐sequence divergence, the mitogenomes are both compositionally and structurally similar, with only four trn genes relocated and overall gene order very similar to the phylogenetically close mitogenomes of Perumytilus purpuratus . Lineage‐specific differences are limited to the non‐coding regions and a short cox2 extension present in the paternally inherited M mitogenome. Phylogenetic analysis shows deeper separation of M and F lineages in Geukensia , than in Perumytilus consistent with higher protein divergence. It can be speculated that stronger mutational pressure in Geukensia is driving faster evolution of its mitogenomes.