Mitochondrial DNA of the Demosponge Acanthella acuta: Linear Architecture and Other Unique Features

被引:1
作者
Ahmed, Momin [1 ]
Kayal, Ehsan [1 ]
Lavrov, Dennis, V [1 ]
机构
[1] Iowa State Univ, Dept Ecol Evolut & Organismal Biol, Ames, IA 50011 USA
来源
GENOME BIOLOGY AND EVOLUTION | 2024年 / 16卷 / 08期
基金
美国国家科学基金会;
关键词
linear mitochondrial DNA; demosponges; Acanthella acuta; Porifera; horizontal gene transfer; gene fusion; GENOME ORGANIZATION; EVOLUTION; CNIDARIA; HETEROPLASMY; SEQUENCE;
D O I
10.1093/gbe/evae168
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
While Acanthella acuta Schmidt 1862, a common demosponge found in the Mediterranean Sea and Atlantic Ocean, is morphologically similar to other sponges, its mitochondrial DNA (mtDNA) is unique within the class. In contrast to all other studied demosponges, the mtDNA of A. acuta is inferred to be linear and displays several unusual features such as inverted terminal repeats, group II introns in three mitochondrial genes, and two unique open reading frames (ORFs): one of which (ORF1535) combines a DNA polymerase domain with a DNA-directed RNA polymerase domain, while the second bears no discernible similarity to any reported sequences. The group II intron within the cox2 gene is the first such intron reported in an animal. Our phylogenetic analyses indicate that the cox1 intron is related to similar introns found in other demosponges, while the cox2 intron is likely not of animal origin. The two domains found within ORF1535 do not share a common origin and, along with the cox2 intron, were likely acquired by horizontal gene transfer. The findings of this paper open new avenues of exploration in the understanding of mtDNA linearization within Metazoa.
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页数:11
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