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ZFIN ID: ZDB-FIG-120727-40
Niu et al., 2012 - Sec13 safeguards the integrity of the endoplasmic reticulum and organogenesis of the digestive system in zebrafish. Developmental Biology   367(2):197-207 Full text @ Dev. Biol.
Anatomical Terms:
Stage Range: 2-cell to Day 5
Knockdown Reagent:
Observed In:
Stage: Protruding-mouth

Fig. 6 The sec13sq198 mutation creates a novel splice receptor site in intron7 of sec13. (A) Diagram summarizing map-based cloning of the sec13sq198 mutant gene. Genetic markers used in mapping are shown on top with their corresponding number of recombinants shown below in bracket. The mutant gene (mu) was located between markers 257H and 257E spanning a 54.3 kb genomic DNA fragment contained in two overlapping BACs (CH211-165I22 and CH211-257F16). (B,C) Analysis of sec13 genomic DNA sequence in sq198 identified a T to A substitution (indicated by red arrows in B) that creates a novel splice receptor site (underlined in red in C, panel for Genomic DNA sequence) in intron 7 of sec13. Native splice receptor site for Intron7/Exon8: underlined in blue. Intron sequence: black letters; exon sequence: red letters. An eight nucleotides insertion (black letters) was identified in the sec13 cDNA derived from sec13sq198 (C, panel for cDNA sequence). (D,E) Injection of the sec13 splicing blocking morpholino sp2 altered sec13 transcripts with 66 nucleotides deletion (D) that led to the small liver phenotype as conferred by the sec13m198 mutation when examined with the liver marker fabp10a at 3 dpf (E). (F) Northern analysis of sec13 transcripts in unfertilized eggs (Mt) and 1dpf to 5 dpf embryos using a sec13 probe. 18S RNA was used as loading control. (G) WISH analysis of sec13 expression patterns in unfertilized eggs (Mt), zygotic eggs at 1-cell, 2-cell and 4-cell stages, and in embryos at 3 dpf and 4 dpf. bc: branchial arch; in: intestine; lv: liver; pa: pancreas. (H) Western analysis of Sec13 and Sec31a protein expression, respectively, in unfertilized eggs (Mt) and 1 dpf to 5 dpf embryos. Tubulin was used as loading control.

Gene Expression Details
Gene Antibody Fish Conditions Stage Qualifier Anatomy Assay
sec13 AB standard conditions 2-cell whole organism ISH
1-cell whole organism ISH
Ab1-sec13 1-cell whole organism WB
1-cell whole organism NB
4-cell whole organism ISH
Prim-5 whole organism NB
Ab1-sec13 Prim-5 whole organism WB
Long-pec whole organism NB
Ab1-sec13 Long-pec whole organism WB
Protruding-mouth exocrine pancreas ISH
Protruding-mouth head ISH
Protruding-mouth intestine ISH
Protruding-mouth liver ISH
Protruding-mouth trunk ISH
Ab1-sec13 Protruding-mouth whole organism WB
Protruding-mouth whole organism NB
Day 4 exocrine pancreas ISH
Day 4 intestine ISH
Day 4 liver ISH
Day 4 pharyngeal arch cartilage ISH
Ab1-sec13 Day 4 whole organism WB
Day 4 whole organism NB
Ab1-sec13 Day 5 whole organism WB
Day 5 whole organism NB
sec31a Ab1-sec31a AB standard conditions 1-cell Not Detected whole organism WB
Ab1-sec31a Prim-5 Not Detected whole organism WB
Ab1-sec31a Long-pec whole organism WB
Ab1-sec31a Protruding-mouth whole organism WB
Ab1-sec31a Day 4 whole organism WB
Ab1-sec31a Day 5 whole organism WB
Antibody Labeling Details No data available
Phenotype Details
Fish Conditions Stage Phenotype
AB + MO3-sec13 standard conditions Protruding-mouth liver decreased size, abnormal
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Reprinted from Developmental Biology, 367(2), Niu, X., Gao, C., Jan Lo, L., Luo, Y., Meng, C., Hong, J., Hong, W., and Peng, J., Sec13 safeguards the integrity of the endoplasmic reticulum and organogenesis of the digestive system in zebrafish, 197-207, Copyright (2012) with permission from Elsevier. Full text @ Dev. Biol.