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Zhou W, Cai W, Li Y, Gao L, Liu X, Liu S, Lei J, Zhang J, Wang Y, Jiang Z, Wu X, Fan X, Li F, Zheng L, Yuan W. The Interaction Between the asb5a and asb5b Subtypes Jointly Regulates the L-R Asymmetrical Development of the Heart in Zebrafish. Int J Mol Sci 2025; 26:2765. [PMID: 40141403 PMCID: PMC11943173 DOI: 10.3390/ijms26062765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2025] [Revised: 03/17/2025] [Accepted: 03/17/2025] [Indexed: 03/28/2025] Open
Abstract
The asb5 gene, a member of the Asb protein subfamily characterized by six ankyrin repeat domains, is highly conserved and comprises two subtypes, asb5a and asb5b, in zebrafish. Our previous research has demonstrated that a deficiency of the asb5 gene significantly impairs early cardiac contractile function, highlighting its close relationship with heart development. Zebrafish asb5 expression was disrupted by both morpholino (MO) antisense oligomer-mediated knockdown and a CRISPR-Cas9 system. A high-throughput RNA-Seq analysis was used to analyze the possible molecular regulatory mechanism of asb5 gene deletion leading to left-right (L-R) asymmetry defects in the heart. Whole-mount in situ hybridization (WISH) was conducted to evaluate gene expression patterns of Nodal signaling components and the positions of heart organs. Heart looping was defective in zebrafish asb5 morphants. Rescue experiments in the asb5-deficiency group (inactivating both asb5a and asb5b) demonstrated that the injection of either asb5a-mRNA or asb5b-mRNA alone was insufficient to rectify the abnormal L-R asymmetry of the heart. In contrast, the simultaneous injection of both asb5a-mRNA and asb5b-mRNA successfully rescued the morphological phenotype. A high-throughput RNA-Seq analysis of embryos at 48 h post fertilization (hpf) revealed that numerous genes associated with L-R asymmetry exhibited expression imbalances in the asb5-deficiency group. WISH further confirmed that the expression of genes such as fli1a, acta1b, hand2, has2, prrx1a, notch1b, and foxa3 were upregulated, while the expression of mei2a and tal1 was downregulated. These results indicated that loss of the asb5 gene in zebrafish led to the disordered development of L-R asymmetry in the heart, resulting in an imbalance in the expression of genes associated with the regulation of L-R asymmetry. Subsequently, we examined the expression patterns of classical Nodal signaling pathway-related genes using WISH. The results showed that the midline barrier factor gene lefty1 was downregulated at early stages in the asb5-deficiency group, and the expression of spaw and lefty2, which are specific to the left lateral plate mesoderm (LPM), was disrupted. This study reveals that the two subtypes of the asb5 gene in zebrafish, asb5a and asb5b, interact and jointly regulate the establishment of early cardiac L-R asymmetry through the Nodal-spaw-lefty signaling pathway.
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Affiliation(s)
- Wanbang Zhou
- The Laboratory of Heart Development Research, College of Life Science, Hunan Normal University, Changsha 410081, China; (W.Z.); (W.C.); (Y.L.); (L.G.); (X.L.); (S.L.); (Y.W.); (Z.J.); (X.W.); (X.F.); (F.L.)
- Laboratory of Physical Fitness and Exercise Rehabilitation of Hunan Province, College of Physical Education, Hunan Normal University, Changsha 410012, China; (J.L.); (J.Z.)
| | - Wanwan Cai
- The Laboratory of Heart Development Research, College of Life Science, Hunan Normal University, Changsha 410081, China; (W.Z.); (W.C.); (Y.L.); (L.G.); (X.L.); (S.L.); (Y.W.); (Z.J.); (X.W.); (X.F.); (F.L.)
- Laboratory of Physical Fitness and Exercise Rehabilitation of Hunan Province, College of Physical Education, Hunan Normal University, Changsha 410012, China; (J.L.); (J.Z.)
| | - Yongqing Li
- The Laboratory of Heart Development Research, College of Life Science, Hunan Normal University, Changsha 410081, China; (W.Z.); (W.C.); (Y.L.); (L.G.); (X.L.); (S.L.); (Y.W.); (Z.J.); (X.W.); (X.F.); (F.L.)
| | - Luoqing Gao
- The Laboratory of Heart Development Research, College of Life Science, Hunan Normal University, Changsha 410081, China; (W.Z.); (W.C.); (Y.L.); (L.G.); (X.L.); (S.L.); (Y.W.); (Z.J.); (X.W.); (X.F.); (F.L.)
| | - Xin Liu
- The Laboratory of Heart Development Research, College of Life Science, Hunan Normal University, Changsha 410081, China; (W.Z.); (W.C.); (Y.L.); (L.G.); (X.L.); (S.L.); (Y.W.); (Z.J.); (X.W.); (X.F.); (F.L.)
| | - Siyuan Liu
- The Laboratory of Heart Development Research, College of Life Science, Hunan Normal University, Changsha 410081, China; (W.Z.); (W.C.); (Y.L.); (L.G.); (X.L.); (S.L.); (Y.W.); (Z.J.); (X.W.); (X.F.); (F.L.)
| | - Junrong Lei
- Laboratory of Physical Fitness and Exercise Rehabilitation of Hunan Province, College of Physical Education, Hunan Normal University, Changsha 410012, China; (J.L.); (J.Z.)
| | - Jisheng Zhang
- Laboratory of Physical Fitness and Exercise Rehabilitation of Hunan Province, College of Physical Education, Hunan Normal University, Changsha 410012, China; (J.L.); (J.Z.)
| | - Yuequn Wang
- The Laboratory of Heart Development Research, College of Life Science, Hunan Normal University, Changsha 410081, China; (W.Z.); (W.C.); (Y.L.); (L.G.); (X.L.); (S.L.); (Y.W.); (Z.J.); (X.W.); (X.F.); (F.L.)
| | - Zhigang Jiang
- The Laboratory of Heart Development Research, College of Life Science, Hunan Normal University, Changsha 410081, China; (W.Z.); (W.C.); (Y.L.); (L.G.); (X.L.); (S.L.); (Y.W.); (Z.J.); (X.W.); (X.F.); (F.L.)
| | - Xiushan Wu
- The Laboratory of Heart Development Research, College of Life Science, Hunan Normal University, Changsha 410081, China; (W.Z.); (W.C.); (Y.L.); (L.G.); (X.L.); (S.L.); (Y.W.); (Z.J.); (X.W.); (X.F.); (F.L.)
| | - Xiongwei Fan
- The Laboratory of Heart Development Research, College of Life Science, Hunan Normal University, Changsha 410081, China; (W.Z.); (W.C.); (Y.L.); (L.G.); (X.L.); (S.L.); (Y.W.); (Z.J.); (X.W.); (X.F.); (F.L.)
| | - Fang Li
- The Laboratory of Heart Development Research, College of Life Science, Hunan Normal University, Changsha 410081, China; (W.Z.); (W.C.); (Y.L.); (L.G.); (X.L.); (S.L.); (Y.W.); (Z.J.); (X.W.); (X.F.); (F.L.)
| | - Lan Zheng
- Laboratory of Physical Fitness and Exercise Rehabilitation of Hunan Province, College of Physical Education, Hunan Normal University, Changsha 410012, China; (J.L.); (J.Z.)
| | - Wuzhou Yuan
- The Laboratory of Heart Development Research, College of Life Science, Hunan Normal University, Changsha 410081, China; (W.Z.); (W.C.); (Y.L.); (L.G.); (X.L.); (S.L.); (Y.W.); (Z.J.); (X.W.); (X.F.); (F.L.)
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Tortajada M, Moreno M, Gracia M, Sanchis A. Situs ambiguous in a schoolchild. BMJ Case Rep 2009; 2009:bcr0720092071. [PMID: 22121394 DOI: 10.1136/bcr.07.2009.2071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
We report the case of a 9-year-old child with asthma, atopic dermatitis and allergic rhinoconjunctivitis due to house dust mites, in whom a routine chest x-ray identified by chance abnormal organ position, such as the stomach located on the right side. Abdominal ultrasonography indicated a centralised liver, with polysplenia on the right side and an inferior cava vein located to the left of the aorta with no interruption. Ultrasonography did not show heart defects. Magnetic resonance imaging (MRI) of the abdomen was performed that showed a short pancreas, with no neck, body and tail in it, and a left inferior vena cava with normal outlet of the renal veins, and absence of the intrahepatic part of the inferior vena cava, that was replaced by the left hemiazygos vein. Spinal cord MRI revealed dorsal syringomelia. In view of the results obtained, the diagnosis of situs ambiguous was established.
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Affiliation(s)
- Miguel Tortajada
- Hospital Universitario Dr Peset, Paediatric Service, Avda Gaspar Aguilar 90, Valencia, 46017, Spain
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