Vibrio sp. ArtGut-C1, a polyhydroxybutyrate producer isolated from the gut of the aquaculture live diet Artemia (Crustacea)

BACKGROUND: Vibrio species display variable and plastic fitness strategies to survive and interact with multiple hosts, including marine aquaculture species that are severely affected by pathogenic Vibrios. The culturable Vibrio sp. strain ArtGut-C1, the focus of this study, provides new evidence of such phenotypic plasticity as it accumulates polyhydroxybutyrate (PHB), a biodegradable polymer with anti-pathogen activity, particularly in the marine larviculture phase. The strain was isolated from the gut of laboratory-reared Artemia individuals, the live diet and PHB carrier used in larviculture. Its main phenotypic properties, taxonomic status and genomic properties are reported based on the whole-genome sequencing. RESULTS: Vibrio sp. ArtGut-C1 yielded 72.6% PHB of cells' dry weight at 25 C. The genomic average nucleotide identity (ANI) shows it is closely related to V. diabolicus (ANI: 88.6%). Its genome contains 5,236,997- bp with 44.8% GC content, 3,710 protein-coding sequences, 96 RNA, 9 PHB genes functionally related to PHB metabolic pathways, and several genes linked to competing and colonizing abilities. CONCLUSIONS: This culturable PHB-accumulating Vibrio strain shows high genomic and phenotypic variability. It may be used as a natural pathogen biocontrol in the marine hatchery and as a potential cell factory for PHB production.

Relato de caso: bebê arlequim – ictiose congênita / Case report: baby harlequin - congenital ichthyosis

Feto arlequim é uma variante grave da ictiose congenita, uma herança autossômica recessiva que causa alteração da queratinização da pele, que incide em cerca de 1/100.000 nascimentos e está geralmente associada a consaguinidade dos pais. Manifesta-se ao nascimento como uma pele espessada que evolui para rachaduras generalizadas, comprometendo as suas funções básicas e predispondo a infecções. Relata-se o caso de um RN do sexo feminino, cujos pais não referem nenhum grau de parentesco. A mesma foi mantida em isolamento em incubadora, mas feleceu no nono dia de vida por insuficiência respiratória restritiva.

Harlequin fetus is a variant of severe congenital ichthyosis, an autosomal recessive heredity make change in the keratinization of skin, which appear around 1/100.000 births and is usually associated with consaguineus parents. At birth it seems like a thicken skin that develops into widespread cracks, affecting its basics functions and predisposes to infections. We report the case of a female newborn, whose parents don’t mention any degree of kinship. The baby stood on isolation in incubator, but died at ninth day of life from restrictive respiratory failure.