Draft Genome Sequence of Vibrio parahaemolyticus Strain
VP14, Isolated from a Penaeus vannamei Culture Farm
Ashok Kumar Jangam,
a
T. Bhuvaneswari,
b
A. Navaneeth Krishnan,
b
Vinaya Kumar Katneni,
a
Satheesha Avunje,
b
Monendra Grover,
c
Sujeet Kumar,
b
S. V. Alavandi,
b
K. K. Vijayan
b
a
Nutrition Genetics and Biotechnology Division, ICAR-Central Institute of Brackishwater Aquaculture, Chennai,
Tamil Nadu, India
b
Aquatic Animal Health and Environment Division, ICAR-Central Institute of Brackishwater Aquaculture,
Chennai, Tamil Nadu, India
c
Division of Computer Applications, ICAR-Indian Agricultural Statistics Research Institute, New Delhi, India
ABSTRACT Here, we report the draft genome sequence of an isolate of Vibrio para-
haemolyticus, VP14, recovered from the gut of Penaeus vannamei shrimp farmed in
southern India. The genome of VP14 comprised 5,224,046 bp with a GC content of
45.3% and contained 5,326 genes, including 4,972 coding sequences.
V
ibrio parahaemolyticus is a Gram-negative halophilic bacterium, abundant in brack-
ish water and marine environments. While most strains are nonpathogenic, some
cause disease in humans and aquatic animals. Acute hepatopancreatic necrosis disease
(AHPND) has emerged as an important disease of concern in the shrimp farming
industry, causing substantial economic losses globally (1). AHPND is caused by specific
strains of V. parahaemolyticus harboring a plasmid that encodes PirA
vp
and PirB
vp
(2).
During disease surveillance of farmed shrimp, V. parahaemolyticus was isolated in the
Nellore District of Andhra Pradesh, India, from the gut of P. vannamei with reported
mortality within 40 days of culture. The purified bacterial isolate was phenotypically
identified as V. parahaemolyticus and designated VP14. Further, the species was con-
firmed by species-specific PCR tests based on the vpm, toxR, and gyrB genes (3) and 16S
rRNA gene sequencing. However, this isolate did not reproduce AHPND following
previously described experimental protocols (1), and it also failed to produce AHPND-
specific PCR amplicons (4). The VP14 genome was found to possess a type III secretin
system 1 (T3SS1) based on a positive PCR test for the vscP gene. However, a negative
PCR test was obtained for the vscC2, vopB2, vscS2, and vopC (5) genes, which are
indicative of the presence of T3SS2. Further, the VP14 isolate could not induce mortality
to juvenile shrimp during infection experiments.
To generate the VP14 genome, DNA was initially isolated using a PowerLyzer
UltraClean microbial DNA isolation kit (Mo Bio, USA) and sequenced on the Illumina
HiSeq platform. The de novo assembly with 1,754,630 paired-end reads of 250 bp in the
MaSuRCA assembler (6) generated a genome of 5,224,046 bp with a 45.3% GC content.
The assembly contained 94 scaffolds with a coverage of 84, an N
50
length of 279,839
bp, and a mean length of 55,575 bp. Genome annotation was performed with the NCBI
Prokaryotic Genome Annotation Pipeline (PGAP) (7) and subsequently with the Rapid
Annotations using Subsystems Technology (RAST) server (8). The genome contained
5,326 genes, including 4,972 coding sequences, 10 5S rRNAs, 15 16S rRNAs, 12 23S
rRNAs, 161 tRNAs, 4 noncoding RNAs, and 152 pseudogenes.
The VP14 genome was found to have all 39 virulence factors listed as T3SS1
(responsible for causing cytotoxicity of host cells) in the Virulence Factors Database
(VFDB, http://www.mgc.ac.cn/VFs), as well as the MAM7 gene (responsible for mediat-
ing attachment of bacteria to host cells). However, other virulence factors listed in the
Received 8 February 2018 Accepted 13
February 2018 Published 15 March 2018
Citation Jangam AK, Bhuvaneswari T, Krishnan
AN, Katneni VK, Avunje S, Grover M, Kumar S,
Alavandi SV, Vijayan KK. 2018. Draft genome
sequence of Vibrio parahaemolyticus strain
VP14, isolated from a Penaeus vannamei culture
farm. Genome Announc 6:e00149-18. https://
doi.org/10.1128/genomeA.00149-18.
Copyright © 2018 Jangam et al. This is an
open-access article distributed under the terms
of the Creative Commons Attribution 4.0
International license.
Address correspondence to K. K. Vijayan,
vjciba2014@gmail.com.
PROKARYOTES
crossm
Volume 6 Issue 11 e00149-18 genomea.asm.org 1