AI Article Synopsis
- Doubly uniparental inheritance (DUI) of mitochondrial DNA in bivalves challenges the traditional view of strict maternal mtDNA inheritance.
- Recent research found a 'sperm transmission element' (STE) in the Mediterranean mussel that may protect male-transmitted mitochondria during sperm development, with similar motifs identified in other marine mussels.
- The study extends the search for additional STE signatures in various bivalve species, suggesting implications for understanding the evolution of DUI in ancestral bivalves and highlighting avenues for further exploration.
Article Abstract
Doubly uniparental inheritance (DUI) of mitochondrial DNA (mtDNA) in bivalve mollusks is one of the most notable departures from the paradigm of strict maternal inheritance of mtDNA among metazoans. Recently, work on the Mediterranean mussel suggested that a nucleotide motif in the control region of this species, known as the sperm transmission element (STE), helps protect male-transmitted mitochondria from destruction during spermatogenesis. Subsequent studies found similar, yet divergent, STE motifs in other marine mussels. Here, we extend the in silico search for mtDNA signatures resembling known STEs. This search is carried out for the large unassigned regions of 157 complete mitochondrial genomes from within the Mytiloida, Veneroida, Unionoida, and Ostreoida bivalve orders. Based on a sliding window approach, we present evidence that there are additional putative STE signatures in the large unassigned regions of several marine clams and freshwater mussels with DUI. We discuss the implications of this finding for interpreting the origin of doubly uniparental inheritance in ancestral bivalve mollusks, as well as potential future in vitro and in silico studies that could further refine our understanding of the early evolution of this unusual system of mtDNA inheritance.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8394068 | PMC |
| http://dx.doi.org/10.3390/genes12081211 | DOI Listing |
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