The Functional Roles of Zebrafish HoxA- and HoxD-related Clusters in the Pectoral Fin Development

Overview

Journal Sci Rep

Specialty Science

Date 2024 Oct 9

PMID 39384796

Authors

Mizuki Ishizaka

Akiteru Maeno

Hidemichi Nakazawa

Renka Fujii

Sae Oikawa

Taisei Tani

Haruna Kanno

Rina Koita

Akinori Kawamura

Affiliations

Soon will be listed here.

Abstract

The paralogs 9-13 Hox genes in mouse HoxA and HoxD clusters are critical for limb development. When both HoxA and HoxD clusters are deleted in mice, significant limb truncation is observed compared to the phenotypes of single and compound mutants of Hox9-13 genes in these clusters. In zebrafish, mutations in hox13 genes in HoxA- and HoxD-related clusters result in abnormal morphology of pectoral fins, homologous to forelimbs. However, the effect of the simultaneous deletions of entire HoxA- and HoxD-related clusters on pectoral fin development remains unknown. Here, we generated mutants with several combinations of hoxaa, hoxab, and hoxda cluster deletions and analyzed the pectoral fin development. In hoxaa;hoxab;hoxda larvae, the endoskeletal disc and the fin-fold are significantly shortened in developing pectoral fins. In addition, we show that this anomaly is due to defects in the pectoral fin growth after the fin bud formation. Furthermore, in the surviving adult mutants, micro-CT scanning reveals defects in the posterior portion of the pectoral fin which is thought to represent latent regions of the limb. Our results further support that the functional role of HoxA and HoxD clusters is conserved in the paired appendage formation in bony fishes.

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