Identification of Candidate Genes for Red-Eyed (Albinism) Domestic Guppies Using Genomic and Transcriptomic Analyses.

Guppies are small tropical fish with brightly colored bodies and variable tail shapes. There are two phenotypes of domestic guppy eye color: red and black. The wild type is black-eyed. The main object of this study was to identify candidate genes for the red-eyed phenotype in domestic guppies. We hope to provide molecular genetic information for the development of new domestic guppy strains. Additionally, the results also contribute to basic research concerning guppies. In this study, 121 domestic guppies were used for genomic analysis (GWAS), and 44 genes were identified. Furthermore, 21 domestic guppies were used for transcriptomic analysis, and 874 differentially expressed genes (DEGs) were identified, including 357 upregulated and 517 downregulated genes. Through GO and KEGG enrichment, we identified some important terms or pathways mainly related to melanin biosynthesis and ion transport. qRT-PCR was also performed to verify the differential expression levels of four important candidate genes (TYR, OCA2, SLC45A2, and SLC24A5) between red-eyed and black-eyed guppies. Based on the results of genomic and transcriptomic analyses, we propose that OCA2 is the most important candidate gene for the red-eyed phenotype in guppies.

Severe mitral valve insufficiency after transcatheter atrial septal defect closure with the amplatzer septal occluder: a device-related complication.

Atrial septal defect (ASD) is the one of the most common congenital cardiac diseases. Percutaneous device closure of the ASD has developed as an alternative to traditional surgical closure with a similar outcome, decreased surgical trauma, and shorter hospital stay. However, several complications have been reported. We now report a rare complication of late severe mitral insufficiency (MI) after a successful closure of a secundum ASD with an Amplatzer device. The potential mechanisms may be the continual traction of the oversized mismatched device on the root of the mitral annulus and the insufficient rim to the mitral annulus. The patient was sent for a surgical operation to remove the device, and the defect was closed. No MI was found at the one-year follow-up.