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2017 ; 7
(1
): 16357
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NumtS colonization in mammalian genomes
#MMPMID29180746
Calabrese FM
; Balacco DL
; Preste R
; Diroma MA
; Forino R
; Ventura M
; Attimonelli M
Sci Rep
2017[Nov]; 7
(1
): 16357
PMID29180746
show ga
The colonization of the nuclear genome by mitochondrial DNA is an ongoing process
in eukaryotes and plays an important role in genomic variability. Notwithstanding
the DNA sequence availability of about 100 complete eukaryotic genomes, up to now
NumtS distribution has been fully reported for a small number of sequenced
eukaryotic species. With the aim to clarify the time and way of NumtS evolution,
we explored the genomic distribution of NumtS in 23 eukaryotic species using an
intra/interspecies in silico approach based on a cross-species similarity search
and deeply investigate the evolution of NumtS in mammals. The intra- and
interspecies analysis underlined how some mitochondrial regions that populated
nuclear genomes can be considered as hotspots. Considering the large amount of
NumtS we found in platypus and opossum genomes, we hypothesized the occurrence of
an earlier colonization that happened prior to the Prototherian/Therian mammal
divergence, approximately 160-210 million years ago. These events are still
detectable due to the species-specific dynamics that have affected these genomes.
Phylogenetic analyses of NumtS derived from two different mitochondrial DNA loci
allowed us to recognize the unusual NumtS evolution that acted differently on
primate and non-primate species' genomes.