zic1/zic4
Fin morphology (skeleton; dorsal fin; caudal fin)
Pigmentation (ventralized trunk)
Cis-regulatory,
Insertion
Oryzias latipes
Japanese medaka - (species) D
Intraspecific
Linkage Mapping
Moriyama Y; Kawanishi T; Nakamura R ; et al. (2012)
The medaka zic1/zic4 mutant provides molecular insights into teleost caudal fin evolution.
1 Additional References
GP00002038
Zic1
P46684
Morphology
Morphology
The mutant phenotype is caused by a dramatic decrease of zic1/zic4 expression in the dorsal somites. The insertion of a transposon (“Albatross”) into an enhancer region (downstream of zic4) of the transcription factors zic1 and zic4 causes this phenotype. Both genes are expressed by a bi-directional promoter. The transposon insertion is proposed to interfere with the transcriptional regulation of zic1/zic4; resulting in the disturbance of the expression of the transcription factors in the dorsal somites (the expression of zic1/zic4 in other parts of the body is not affected in this mutant) and ultimately causing a ventralized trunk phenotype. In Inoue et al. (2017) it was shown that the transposon “Albatross” is actually larger than originally predicted; and is now called “Teratorn”. Teratorn is around 180kb long and appears to originate from the fusion of a DNA transposon and a herpesvirus.
Oryzias latipes
Japanese medaka - (species)
Oryzias latipes
Japanese medaka - (species) D
zic1/zic4
Oryzias latipes
Japanese medaka - (species)
Published - Accepted by Curator
zic1/zic4
Fin morphology (skeleton; caudal fin)
Cis-regulatory,
Deletion
Betta splendens
Siamese fighting fish - (species) D
Domesticated
Linkage Mapping
Wang L; Sun F; Wan ZY ; et al. (2021)
Genomic Basis of Striking Fin Shapes and Colors in the Fighting Fish.
GP00002385
Zic1
P46684
Morphology
"We further sequenced the genomes of both homozygous single- and double-tail fish and found in double tail no large sequence variation except for a ∼180-bp deletion ∼15-kb downstream of zic4 (fig. 4C and supplementary fig. S19a, Supplementary Material online). This deletion was located in a cluster of CNEs and coincided with predicted CNE.006008 (supplementary fig. S19b, Supplementary Material online)."
"We observed that the wild-type ST allele significantly enhanced green fluorescent protein (GFP) expression in embryos at 24 hpf, when both zic1 and zic4 show differential expression between double-tail and wild-type fish (Moriyama et al. 2012), whereas no visible GFP expression was detected for the st allele (fig. 4E and supplementary table S11, Supplementary Material online). The efficiency of the two alleles as candidate enhancers was further examined using a Dual-Luciferase Reporter Assay, which showed that the ST allele enhanced luciferase expression by ∼10× relative to st allele in Singapore grouper embryonic cell line (fig. 4F)."
"Finally, we deleted this enhancer using the CRISPR-Cas9 system in fighting fish. Considering the efficiency of tested gRNAs and the cluster of CNEs that could have unpredicted functions, we limited the modification to the CNE.006008 region and did not involve the other CNEs (supplementary fig. S20, Supplementary Material online). Genetic analysis revealed that none of these fish had completely deleted CNE.006008, suggesting nonsimultaneous cutting at multiple targeted gRNA positions. These mosaic fish (n = 7) had significantly more fin rays than the noninjected controls (P < 0.01; fig. 4G). "
Betta splendens
Siamese fighting fish - (species)
Betta splendens
Siamese fighting fish - (species) D
zic1/zic4
Betta splendens
Siamese fighting fish - (species)
Published - Accepted by Curator