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Complete female-transmitted mitochondrial genomes of two freshwater mussels from the Lake Biwa system in Japan: Nodularia douglasiae and N. nipponensis.

ABSTRACT: We determined the complete mitochondrial sequences of female-transmitted (F) mitogenomes of two unionid specimens from the Lake Biwa system, Japan. Their gene contents and orders agreed with those of the typical F mitogenome of freshwater mussels. Molecular phylogenetic analysis using 20 previously identified partial COI and seven (five previously identified and two newly determined) whole mitogenome sequences revealed that one of the two mitogenomes was that of Nodularia douglasiae, while the other was N. nipponensis.

SUBMITTER: Mabuchi K

PROVIDER: S-EPMC8078931 | biostudies-literature |

REPOSITORIES: biostudies-literature

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The complete mitochondrial genome of freshwater mussel Nodularia douglasiae (Unionidae) from Lake Kasumigaura, Japan, and its phylogenetic analysis.

Project description:We have sequenced the female type (F-type) mitochondrial genome of Nodularia douglasiae (Unioninae, Unionidae, Unionida, Bivalvia) from Lake Kasumigaura, Japan, and inferred the Unioninae phylogeny using complete mitochondrial genome sequences. The complete F-type mitochondrial genome (15,779 bp; LC496352) contains 13 protein-coding genes, 2 rRNA genes, and 22 tRNA genes. Molecular phylogenetic analyses using complete F-type mitochondrial genomes from 15 Unioninae species including N. douglasiae from China and Korea were performed. This study should be basic data to investigate the genetic diversity of freshwater mussel N. douglasiae.

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Complete F mitochondrial genomes of two freshwater mussels from the Lake Biwa system in Japan: Beringiana fukuharai and Sinanodonta tumens.

Project description:We determined the complete mitochondrial sequences of female-transmitted (F) mitogenomes of six unionid specimens from the Lake Biwa system, Japan. Their gene contents and orders agreed with those of the typical F mitogenome of freshwater mussels. Molecular phylogenetic analysis using fifteen previously identified partial COI and 12 (six previously identified and six newly determined) whole mitogenome sequences revealed that five of the six mitogenomes (LC592401, LC592402, LC592403, LC592408, and LC592410) were those of Beringiana fukuharai, while the remaining one (LC592406) was Sinanodonta tumens.

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Morphological and phylogenetic characterizations of freshwater Thioploca species from Lake Biwa, Japan, and Lake Constance, Germany.

Project description:Filamentous, gliding, sulfide-oxidizing bacteria of the genus Thioploca were found on sediments in profundal areas of Lake Biwa, a Japanese freshwater mesotrophic lake, and were characterized morphologically and phylogenetically. The Lake Biwa Thioploca resembled morphologically Thioploca ingrica, a brackish water species from a Danish fjord. The diameters of individual trichomes were 3 to 5.6 microm; the diameters of complete Thioploca filaments ranged from 18 to 75 micro m. The cell lengths ranged from 1.2 to 3.8 micro m. In transmission electron microscope specimens stained with uranyl acetate, dense intracellular particles were found, which did not show any positive signals for phosphorus and sulfur in an X-ray analysis. The 16S rRNA gene of the Thioploca from Lake Biwa was amplified by using newly designed Thioploca-specific primers (706-Thioploca, Biwa160F, and Biwa829R) in combination with general bacterial primers in order to avoid nonspecific amplification of contaminating bacterial DNA. Denaturing gradient gel electrophoresis (DGGE) analysis of the three overlapping PCR products resulted in single DGGE bands, indicating that a single 16S rRNA gene had been amplified. With the same method, the Thioploca from Lake Constance was examined. The 16S rRNA sequence was verified by performing fluorescence in situ hybridization targeted at specific motifs of the Lake Biwa THIOPLOCA: Positive signals were obtained with the bacterial probe EUB-338, the gamma-proteobacterial probe GAM42a, and probe Biwa829 targeting the Lake Biwa THIOPLOCA: Based on the nearly complete 16S rRNA sequence and on morphological similarities, the Thioploca from Lake Biwa and the Thioploca from Lake Constance are closely related to T. ingrica and to each other.

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Project description:The circular F-type mitochondrial genome (15,761 bp) was completely sequenced for a Korean freshwater mussel Nodularia douglasiae (synonym Unio douglasiae; Unionidae, Unionida, Bivalvia). It contains 13 PCGs, two rRNA genes, and 22 tRNA genes, as generally shown in metazoan mitochondrial genomes. Its gene order is identical to that of F-type mitochondrial genomes observed in other freshwater mussels. With nucleotide and amino acid sequences of the complete F-type mitochondrial genomes obtained from 38 unionid species reported so far, phylogenetic analyses were done and discussed. The present study may give valuable helps to explore genetic diversity and population structures of other freshwater mussels as well as N. douglasiae.

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Nodularia douglasiae

Project description:Nodularia douglasiae overview

| PRJNA433580 | ENA

Nodularia douglasiae

Project description:Complete mitochondrial sequence of Nodularia douglasiae

| PRJDB11041 | ENA

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Project description:Complete mitochondrial sequence of Nodularia nipponensis

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