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Title: Genome organization of the vg1 and nodal3 gene clusters in the allotetraploid frog Xenopus laevis

Abstract

Extracellular factors belonging to the TGF-β family play pivotal roles in the formation and patterning of germ layers during early Xenopus embryogenesis. Here, we show that the vg1 and nodal3 genes of Xenopus laevis are present in gene clusters on chromosomes XLA1L and XLA3L, respectively, and that both gene clusters have been completely lost from the syntenic S chromosome regions. The presence of gene clusters and chromosome-specific gene loss were confirmed by cDNA FISH analyses. Sequence and expression analyses revealed that paralogous genes in the vg1 and nodal3 clusters on the L chromosomes were also altered compared to their Xenopus tropicalis orthologs. X. laevis vg1 and nodal3 paralogs have potentially become pseudogenes or sub-functionalized genes and are expressed at different levels. As X. tropicalis has a single vg1 gene on chromosome XTR1, the ancestral vg1 gene in X. laevis appears to have been expanded on XLA1L. Of note, two reported vg1 genes, vg1(S20) and vg1(P20), reside in the cluster on XLA1L. The nodal3 gene cluster is also present on X. tropicalis chromosome XTR3, but phylogenetic analysis indicates that nodal3 genes in X. laevis and X. tropicalis were independently expanded and/or evolved in concert within each cluster by gene conversion. Lastly,more » these findings provide insights into the function and molecular evolution of TGF-β family genes in response to allotetraploidization.« less

Authors:
 [1];  [2];  [1];  [3];  [3];  [4];  [1];  [1];  [4];  [2];  [5];  [6]
  1. Hiroshima University, Higashi-Hiroshima(Japan). Amphibian Research Center
  2. Nagoya University, Furo-cho, Chikusa-ku, Nagoya (Japan)
  3. HudsonAlpha Institute of Biotechnology, Huntsville, AL (United States)
  4. Kitasato University, Minamiku, Sagamihara (Japan)
  5. Univ. of California, Berkeley, CA (United States); USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States); Okinawa Institute of Science and Technology Graduate University, Onna, Okinawa (Japan)
  6. Uiversity of Tokyo, Tokyo (Japan)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1633220
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Developmental Biology
Additional Journal Information:
Journal Volume: 426; Journal Issue: 2; Journal ID: ISSN 0012-1606
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; vg1; gdf1; nodal3; Xenopus; TGF-β; Genomic structure

Citation Formats

Suzuki, Atsushi, Uno, Yoshinobu, Takahashi, Shuji, Grimwood, Jane, Schmutz, Jeremy, Mawaribuchi, Shuuji, Yoshida, Hitoshi, Takebayashi-Suzuki, Kimiko, Ito, Michihiko, Matsuda, Yoichi, Rokhsar, Daniel, and Taira, Masanori. Genome organization of the vg1 and nodal3 gene clusters in the allotetraploid frog Xenopus laevis. United States: N. p., 2016. Web. doi:10.1016/j.ydbio.2016.04.014.
Suzuki, Atsushi, Uno, Yoshinobu, Takahashi, Shuji, Grimwood, Jane, Schmutz, Jeremy, Mawaribuchi, Shuuji, Yoshida, Hitoshi, Takebayashi-Suzuki, Kimiko, Ito, Michihiko, Matsuda, Yoichi, Rokhsar, Daniel, & Taira, Masanori. Genome organization of the vg1 and nodal3 gene clusters in the allotetraploid frog Xenopus laevis. United States. https://doi.org/10.1016/j.ydbio.2016.04.014
Suzuki, Atsushi, Uno, Yoshinobu, Takahashi, Shuji, Grimwood, Jane, Schmutz, Jeremy, Mawaribuchi, Shuuji, Yoshida, Hitoshi, Takebayashi-Suzuki, Kimiko, Ito, Michihiko, Matsuda, Yoichi, Rokhsar, Daniel, and Taira, Masanori. Wed . "Genome organization of the vg1 and nodal3 gene clusters in the allotetraploid frog Xenopus laevis". United States. https://doi.org/10.1016/j.ydbio.2016.04.014. https://www.osti.gov/servlets/purl/1633220.
@article{osti_1633220,
title = {Genome organization of the vg1 and nodal3 gene clusters in the allotetraploid frog Xenopus laevis},
author = {Suzuki, Atsushi and Uno, Yoshinobu and Takahashi, Shuji and Grimwood, Jane and Schmutz, Jeremy and Mawaribuchi, Shuuji and Yoshida, Hitoshi and Takebayashi-Suzuki, Kimiko and Ito, Michihiko and Matsuda, Yoichi and Rokhsar, Daniel and Taira, Masanori},
abstractNote = {Extracellular factors belonging to the TGF-β family play pivotal roles in the formation and patterning of germ layers during early Xenopus embryogenesis. Here, we show that the vg1 and nodal3 genes of Xenopus laevis are present in gene clusters on chromosomes XLA1L and XLA3L, respectively, and that both gene clusters have been completely lost from the syntenic S chromosome regions. The presence of gene clusters and chromosome-specific gene loss were confirmed by cDNA FISH analyses. Sequence and expression analyses revealed that paralogous genes in the vg1 and nodal3 clusters on the L chromosomes were also altered compared to their Xenopus tropicalis orthologs. X. laevis vg1 and nodal3 paralogs have potentially become pseudogenes or sub-functionalized genes and are expressed at different levels. As X. tropicalis has a single vg1 gene on chromosome XTR1, the ancestral vg1 gene in X. laevis appears to have been expanded on XLA1L. Of note, two reported vg1 genes, vg1(S20) and vg1(P20), reside in the cluster on XLA1L. The nodal3 gene cluster is also present on X. tropicalis chromosome XTR3, but phylogenetic analysis indicates that nodal3 genes in X. laevis and X. tropicalis were independently expanded and/or evolved in concert within each cluster by gene conversion. Lastly, these findings provide insights into the function and molecular evolution of TGF-β family genes in response to allotetraploidization.},
doi = {10.1016/j.ydbio.2016.04.014},
journal = {Developmental Biology},
number = 2,
volume = 426,
place = {United States},
year = {Wed Oct 05 00:00:00 EDT 2016},
month = {Wed Oct 05 00:00:00 EDT 2016}
}

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Figures / Tables:

Figure 1 Figure 1: Structure and expression of the vg1 gene cluster. (A) Schematic diagrams of the vg1 gene cluster in X. tropicalis (XTR) and X. laevis (XLA). Arrowheads indicate the direction and positions of genes. Distances in the schematic are proportional to the nucleotide lengths of the genes, except for vg1p.Smore » which contains a partial exon 1. Magenta and blue arrowheads indicate complete vg1 genes and the vg1 pseudogene, respectively. Orange and blue bars indicate the region covered by BAC full-sequences and scaffold70461 which were originally constructed in the v7.1 assembly. (B) cDNA FISH analysis of the vg1 gene. Hybridization signals (upper) are shown along with Hoechst staining images (lower) of chromosomes 1L and 1S. The position of the vg1 gene alongside the chromosome banding pattern of XLA1L. (C) RNA-seq expression profile of vg1 genes during oogenesis and early development. oo12, oo34 and oo56 indicate oocyte stage 1/2, 3/4 and 5/6, respectively.« less

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.