Píndaro Díaz-Jaimes

Karyotype analysis in three species of the genus Chirostoma (Atheriniformes: Atherinidae)

Abstract Karyotype analyses of three Chirostoma species, C. estor, C. patzcuaro, and C. jordani from Mexico, are presented. C. estor and C. jordani have both a diploid number of 2N = 48 and a fundamental number of NF = 68, but different karyotype formulae. The co-occurrence of these karyotypes with morphometric and allozymatic primitive features so far reported suggests that the ancestral karyotype of the genus Chirostoma was similar to the one shown by these species. The divergent karyotype of C. patzcuaro (2N = 44 and NF = 44) could be related to its endemism and to the relatively small size of its populations.

The complete mitochondrial DNA of the silky shark (Carcharhinus falciformis).

Abstract The silky shark mitogenome (GeneBank accession number KF801102) has a total length of 17,774u2009bp, the base composition of the genomes was as follows: A (31.36%), T (30.18%), C (25.27%) and G (13.17%), which demonstrated an Au2009+u2009T-rich feature (61.64%), similar to other elasmobranch mitogenomes. The mitochondrial genome contained 13 protein-coding genes and 23 tRNA genes. The tRNA genes ranged from 70 to 72u2009bp. The gene order was the same as in other vertebrates and teleosts.

The complete mitochondrial DNA of the bull shark (Carcharhinus leucas)

Abstract The bull shark mitochondrial structure is similar to that of other elasmobranchs; it has a total length of 16,100 bp, the base composition of the genomes was as follows: A (31.35%), T (31.35%), C (24.38%) and G (12.90%). It contains 13 protein-coding genes and 23 tRNA genes. The tRNA genes range from 70–72 bp. Gene order is the same as in other vertebrates and teleosts.

The mitochondrial genome of the hammerhead Sphyrna zygaena

Abstract The hammerhead shark (Sphyrna zygaena) is listed as a “Vulnerable” species for the International Union for Conservation of Nature (IUCN). Here we report the complete sequence for the mitochondrial genome of the hammerhead shark of a specimen collected from the eastern Pacific Ocean. The genome structure is quite similar to other reported mtDNA shark species. It has a total length of 16,731 base pairs (bp); the base composition was A (31.54%), T (30.23%) C (25.03%) and G: 13.20, contains 13 protein-coding genes, 2 rRNA genes; 21 tRNA genes. In addition, most of the starting (ATG) and ending codons (TAA) for the mtDNA gene regions were registered.

Complete mitogenome sequences of the pacific red snapper (Lutjanus peru) and the spotted rose snapper (Lutjanus gutattus)

Abstract The structure of the mitochondrial genome for the Pacific red snapper, Lutjanus peru, and the spotted rose snapper, Lutjanus gutattus, of specimens collected in the eastern Pacific is similar to the reported for other teleosts and shares the same configuration with other members of the family Lutjanidae. It has a total length of 16 502 and 16 508 base pairs (bp) for Lutjanus peru and L. gutattus, respectively; on average the base composition was A (27.9%), T (24.8%) C (30.9%), and G (16.4%), containing 13 protein-coding genes, 2 rRNA genes, and 22 tRNA genes; and the leucine (Leu) tRNA is duplicated.

The complete mitochondrial DNA of white shark (Carcharodon carcharias) from Isla Guadalupe, Mexico

Abstract The Isla Guadalupe white shark mitochondrial structure is similar to the one previously reported for a white shark individual from Taiwan with a total length of 16,745 and 16,742u2009bp respectively; the base composition of the genomes was as follow A (30.60%), T (28.67%), C (26.86%) and G (13.87%), contains 13 protein-coding genes and 24 tRNA genes and the non-coding control region. The tRNA genes range from 70–72u2009bp. Gene order is the same as in other vertebrates and teleosts.

The complete mitochondrial genome of the Giant Manta ray, Manta birostris

Abstract The complete mitochondrial genome of the giant manta ray (Manta birostris), consists of 18,075u2009bp with rich Au2009+u2009T and low G content. Gene organization and length is similar to other species of ray. It comprises of 13 protein-coding genes, 2 rRNAs genes, 23 tRNAs genes and 1 non-coding sequence, and the control region. We identified an AT tandem repeat region, similar to that reported in Mobula japanica.

The complete mitogenome of the common dolphinfish (Coryphaena hippurus)

Abstract The complete mitochondrial genome of the dolphinfish (GeneBank accession number KF719178) structure is similar to that of other teleosts, has a total length of 15,733u2009bp, the base composition was as follows: A (28.78%), T (29.25%), C (25.45%) and G (16.50%), which demonstrated an Au2009+u2009T (58.04%) rich feature. It contains 13 protein-coding genes and 23 tRNA genes that range from 54 to 72u2009bp. We compared our mitogenome with the one reported by Miya and collaborators in 2013 and found that the average number of nucleotide differences was k: 47.000 resulting in a nucleotide diversity Pi(t) of 0.00299.

Complete mitochondrial genome of the yellowfin tuna (Thunnus albacares) and the blackfin tuna (Thunnus atlanticus): notes on mtDNA introgression and paraphyly on tunas

The genus Thunnus is composed of eight species, which are separated into two groups, the temperate subgenus Thunnus (bluefin tunas group) and the tropical subgenus Neothunnus (yellowfin tunas group). We obtained the mitochondrial genome for two species from the yellowfin group, Thunnus albacares and Thunnus atlanticus, and compared to those from extant Thunnus species to reconstruct the mtDNA phylogenetic relationship within the genus. Our results coincide with previous studies using mtDNA and nuclear loci in the paraphyly of the bluefin group mainly as a result of the position of Thunnus obesus within the tree. Also, we support the introgression hypothesis of the mtDNA from albacore into Pacific Bluefin tuna.

Mitochondrial genomes of the Pacific sierra mackerel Scomberomorus sierra and the Monterey Spanish mackerel Scomberomorus concolor (Perciformes, Scombridae)

Spanish mackerels are a highly diverse group consisting of 18 species distributed worldwide, most of them targeted by fisheries across its distribution range. We report the complete mitochondrial genome sequences of two mackerel species, Monterey Spanish mackerel, Scomberomorus concolor, and Pacific sierra mackerel, Scomberomorus sierra. A total length of 16,699–16,705 bases for S. concolor; and 16,699 bases for S. sierra mitogenomes are reported, with similar structure to other mtDNA genomes found in the Scombridae family. Phylogenetic relationships were reconstructed with five other species from the Scomberomorus genus using mitogenome sequences available in GenBank.