Development and characterization of genomic resources for a non-model marine teleost, the red snapper (Lutjanus campechanus, Lutjanidae): Construction of a high-density linkage map, anchoring of genome contigs and comparative genomic analysis

PLoS One. 2020 Apr 29;15(4):e0232402. doi: 10.1371/journal.pone.0232402. eCollection 2020.

Abstract

The red snapper Lutjanus campechanus is an exploited reef fish of major economic importance in the Gulf of Mexico region. Studies of genome wide genetic variation are needed to understand the structure of wild populations and develop breeding programs for aquaculture but interpretation of these genome scans is limited by the absence of reference genome. In this work, the first draft of a reference genome was developed and characterized for the red snapper. P-454 and Illumina sequencing were conducted to produce paired-end reads that were assembled into reference contigs and scaffolds. The current assembly spans over 770 Mb, representing an estimated 69% of the red snapper genome in 67,254 scaffolds (N50 = 16,803 bp). The genome contigs were applied to map double digest Restriction-Site Associated DNA Tags and characterize Single Nucleotide Polymorphisms (SNPs) in five outbred full-sib families. The identified SNPs and 97 microsatellite loci were used to generate a high-density linkage map that includes 7,420 markers distributed across 24 linkage groups and spans 1,346.64 cM with an average inter-marker distance of 0.18 cM. Sex-specific maps revealed a 1.10:1 female to male map length ratio. A total of 4,422 genome contigs (10.5% of the assembly) were anchored to the map and used in a comparative genomic analysis of the red snapper and two model teleosts. Red snapper showed a high degree of chromosome level syntenic conservation with both medaka and spotted green puffer and a near one to one correspondence between the 24 red snapper linkage groups and corresponding medaka chromosomes was observed. This work established the first draft of a reference genome for a lutjanid fish. The obtained genomic resources will serve as a framework for the interpretation of genome scans during studies of wild populations and captive breeding programs.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Animals
  • Chromosome Mapping
  • Female
  • Genetic Linkage*
  • Genomics
  • Male
  • Microsatellite Repeats
  • Perciformes / genetics*
  • Polymorphism, Single Nucleotide

Grants and funding

EAS and KLJ: Award # NAMI NA10OAR4170078 - R/SSS-04-NSI; National Oceanic and Atmospheric Administration (NOAA) Sea Grant through the National Marine Aquaculture Initiative program; https://seagrant.noaa.gov/ EAS: award #S-13-USM/GCRL01; Mississippi Department of Marine Resources, Mississippi Tidelands Trust Funds Program; http://www.dmr.ms.gov/ The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.