This report describes nephrotic syndrome, type 12, a subtype of nephrotic syndrome that exhibits autosomal recessive inheritance. The human gene implicated is NUP93, which encodes a critical component of the nuclear pore complex. There are two high-scoring fly orthologs, Dmel\Nup93-1 and Dmel\Nup93-2, for which classical alleles, RNAi-targeting constructs, and alleles caused by insertional mutagenesis have been generated.
The human NUP93 gene has not been introduced into flies.
RNAi knockdown of either Dmel\Nup93-1 or Dmel\Nup93-2 in developing nephrocytes results in a significant reduction in the number of pericardial nephrocytes in adult flies, with surviving nephrocytes exhibiting an abnormal morphology.
[updated Nov. 2022 by FlyBase; FBrf0222196]
The nephrotic syndrome is characterized clinically by proteinuria, hypoalbuminemia, hyperlipidemia, and edema. Kidney biopsies show nonspecific histologic changes such as minimal change, focal segmental glomerulosclerosis (FSGS), and diffuse mesangial proliferation. Approximately 20% of affected individuals have an inherited steroid-resistant form and progress to end-stage renal failure (summary by Fuchshuber et al., 1996, pubmed:8606597). [From MIM:256300, 2016.06.13]
[NEPHROTIC SYNDROME, TYPE 12; NPHS12](https://omim.org/entry/616892)
[NUCLEOPORIN, 93-KD; NUP93](https://omim.org/entry/614351)
Nephrotic syndrome type 12 is an autosomal recessive renal disorder caused by defects in the renal glomerular filter. Affected individuals have onset of progressive renal failure in the first years of life. Renal biopsy typically shows focal segmental glomerulosclerosis (FSGS) (summary by Braun et al., 2016; pubmed:26878725). [from MIM:616892; 2022.11.04]
Nephrotic syndrome type 12 is caused by homozygous or compound heterozygous mutation in the NUP93 gene on chromosome 16q13. [from MIM:616892; 2022.11.04]
NUP93 is a critical subunit of the 120-million-Da nuclear pore complex, which functions in active transport of molecules between the nucleus and cytoplasm (Grandi et al., 1997; pubmed:9348540). [from MIM:614351; 2022.11.04]
One to two (1 human to 2 Drosophila); there are two high-scoring Drosophila orthologs of human NUP93.
High-scoring ortholog of human NUP93 (2 Drosophila to 1 human); both Nup93-1 and Nup93-2 are high-scoring orthologs of human NUP93.
High-scoring ortholog of human NUP93 (2 Drosophila to 1 human); both Nup93-2 and Nup93-1 are high-scoring orthologs of human NUP93.