Evidence map›Paper›PMID 29510660›Full record

ArticleBMC genomics2018

Loss of stomach, loss of appetite? Sequencing of the ballan wrasse (Labrus bergylta) genome and intestinal transcriptomic profiling illuminate the evolution of loss of stomach function in fish.

Kai K Lie, Ole K Tørresen, Monica Hongrø Solbakken, Ivar Rønnestad, Ave Tooming-Klunderud, Alexander J Nederbragt, Sissel Jentoft, Øystein Sæle

Open access · goldAbstract read
In one paragraph

Article in BMC genomics, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 27 papers.

0numbers the graph read from it
0cells of the map it votes in
27citing papers in PubMed
4.4field-weighted citation impact, top 5% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

27 citing papers in PubMed, 61 citations in OpenAlex.

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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

8 authors at 3 institutions in 1 country.

Kai K LieInstitute of Marine Research, P.O. Box. 1870, Nordnes, 5817, Bergen, NO, Norway. KaiKristoffer.Lie@hi.no.ORCID 0000-0001-5897-0139
Ole K TørresenCentre for Ecological and Evolutionary Synthesis, Department of Biosciences, University of Oslo, P.O. Box 1066, Blindern, 0316, Oslo, NO, Norway.
Monica Hongrø SolbakkenCentre for Ecological and Evolutionary Synthesis, Department of Biosciences, University of Oslo, P.O. Box 1066, Blindern, 0316, Oslo, NO, Norway.
Ivar RønnestadDepartment of Biology, University of Bergen, P.O. Box 7803, 5020, Bergen, NO, Norway.
Ave Tooming-KlunderudCentre for Ecological and Evolutionary Synthesis, Department of Biosciences, University of Oslo, P.O. Box 1066, Blindern, 0316, Oslo, NO, Norway.
Alexander J NederbragtCentre for Ecological and Evolutionary Synthesis, Department of Biosciences, University of Oslo, P.O. Box 1066, Blindern, 0316, Oslo, NO, Norway.
Sissel JentoftCentre for Ecological and Evolutionary Synthesis, Department of Biosciences, University of Oslo, P.O. Box 1066, Blindern, 0316, Oslo, NO, Norway.
Øystein SæleInstitute of Marine Research, P.O. Box. 1870, Nordnes, 5817, Bergen, NO, Norway.
University of Oslo · NONorwegian Institute of Marine Research · NOUniversity of Bergen · NO

Funding

Fiskeri- og Havbruksnæringens Forskningsfond 900554Fiskeri- og Havbruksnæringens Forskningsfond (NO) 901135
6 · The paper itself

Abstract

backgroundThe ballan wrasse (Labrus bergylta) belongs to a large teleost family containing more than 600 species showing several unique evolutionary traits such as lack of stomach and hermaphroditism. Agastric fish are found throughout the teleost phylogeny, in quite diverse and unrelated lineages, indicating stomach loss has occurred independently multiple times in the course of evolution. By assembling the ballan wrasse genome and transcriptome we aimed to determine the genetic basis for its digestive system function and appetite regulation. Among other, this knowledge will aid the formulation of aquaculture diets that meet the nutritional needs of agastric species.

resultsLong and short read sequencing technologies were combined to generate a ballan wrasse genome of 805 Mbp. Analysis of the genome and transcriptome assemblies confirmed the absence of genes that code for proteins involved in gastric function. The gene coding for the appetite stimulating protein ghrelin was also absent in wrasse. Gene synteny mapping identified several appetite-controlling genes and their paralogs previously undescribed in fish. Transcriptome profiling along the length of the intestine found a declining expression gradient from the anterior to the posterior, and a distinct expression profile in the hind gut.

conclusionsWe showed gene loss has occurred for all known genes related to stomach function in the ballan wrasse, while the remaining functions of the digestive tract appear intact. The results also show appetite control in ballan wrasse has undergone substantial changes. The loss of ghrelin suggests that other genes, such as motilin, may play a ghrelin like role. The wrasse genome offers novel insight in to the evolutionary traits of this large family. As the stomach plays a major role in protein digestion, the lack of genes related to stomach digestion in wrasse suggests it requires formulated diets with higher levels of readily digestible protein than those for gastric species.

Indexed as

Biological EvolutionGene Expression ProfilingAnimalsAppetiteDigestionGastrointestinal TractGenomePerciformesPhylogenyStomachAppetiteBallan wrasseDigestionGhrelinIntestineLabridMotilinNeuropeptideStomachTranscobalamin

Identifiers

PMID29510660
PMCPMC5840709
OpenAlexW2792194684

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.