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mtor Haploinsufficiency Ameliorates Renal Cysts and Cilia Abnormality in Adult Zebrafish tmem67 Mutants.
Zhu, Ping; Qiu, Qi; Harris, Peter C; Xu, Xiaolei; Lin, Xueying.
  • Zhu P; Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota.
  • Qiu Q; Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota.
  • Harris PC; Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota.
  • Xu X; Division of Nephrology and Hypertension, Mayo Clinic, Rochester, Minnesota.
  • Lin X; Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota lin.xueying@mayo.edu xu.xiaolei@mayo.edu.
J Am Soc Nephrol ; 2021 Feb 11.
Article in English | MEDLINE | ID: covidwho-1496674
ABSTRACT

BACKGROUND:

Although zebrafish embryos have been used to study ciliogenesis and model polycystic kidney disease (PKD), adult zebrafish remain unexplored.

METHODS:

Transcription activator-like effector nucleases (TALEN) technology was used to generate mutant for tmem67, the homolog of the mammalian causative gene for Meckel syndrome type 3 (MKS3). Classic 2D and optical-clearing 3D imaging of an isolated adult zebrafish kidney were used to examine cystic and ciliary phenotypes. A hypomorphic mtor strain or rapamycin was used to inhibit mTOR activity.

RESULTS:

Adult tmem67 zebrafish developed progressive mesonephric cysts that share conserved features of mammalian cystogenesis, including a switch of cyst origin with age and an increase in proliferation of cyst-lining epithelial cells. The mutants had shorter and fewer distal single cilia and greater numbers of multiciliated cells (MCCs). Absence of a single cilium preceded cystogenesis, and expansion of MCCs occurred after pronephric cyst formation and was inversely correlated with the severity of renal cysts in young adult zebrafish, suggesting a primary defect and an adaptive action, respectively. Finally, the mutants exhibited hyperactive mTOR signaling. mTOR inhibition ameliorated renal cysts in both the embryonic and adult zebrafish models; however, it only rescued ciliary abnormalities in the adult mutants.

CONCLUSIONS:

Adult zebrafish tmem67 mutants offer a new vertebrate model for renal cystic diseases, in which cilia morphology can be analyzed at a single-nephron resolution and mTOR inhibition proves to be a candidate therapeutic strategy.
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Full text: Available Collection: International databases Database: MEDLINE Type of study: Prognostic study Language: English Journal subject: Nephrology Year: 2021 Document Type: Article

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Full text: Available Collection: International databases Database: MEDLINE Type of study: Prognostic study Language: English Journal subject: Nephrology Year: 2021 Document Type: Article