Genetic Variant NPHS1:p.Arg207GlyfsTer28 (chr19-35849642-CG-C) – ACMG Classification: Pathogenic (18 pts)

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong

The NM_004646.4(NPHS1):c.619delC(p.Arg207GlyfsTer28) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000471 in 1,613,362 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely pathogenic (★★). Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: 𝑓 0.000039 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000048 ( 0 hom. )

Consequence

NPHS1
NM_004646.4 frameshift

Scores

Not classified

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:8

Conservation

PhyloP100: 2.45

Variant links:

Genes affected

NPHS1 (HGNC:7908): (NPHS1 adhesion molecule, nephrin) This gene encodes a member of the immunoglobulin family of cell adhesion molecules that functions in the glomerular filtration barrier in the kidney. The gene is primarily expressed in renal tissues, and the protein is a type-1 transmembrane protein found at the slit diaphragm of glomerular podocytes. The slit diaphragm is thought to function as an ultrafilter to exclude albumin and other plasma macromolecules in the formation of urine. Mutations in this gene result in Finnish-type congenital nephrosis 1, characterized by severe proteinuria and loss of the slit diaphragm and foot processes.[provided by RefSeq, Oct 2009]

NPHS1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 18 ACMG points.

PVS1

Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 19-35849642-CG-C is Pathogenic according to our data. Variant chr19-35849642-CG-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 370188.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
NPHS1	NM_004646.4 link	c.619delC	p.Arg207GlyfsTer28	frameshift_variant	Exon 6 of 29	ENST00000378910.10	NP_004637.1	O60500-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
NPHS1	ENST00000378910.10 link	c.619delC	p.Arg207GlyfsTer28	frameshift_variant	Exon 6 of 29	1	NM_004646.4	ENSP00000368190.4		O60500-1
NPHS1	ENST00000353632.6 link	c.619delC	p.Arg207GlyfsTer28	frameshift_variant	Exon 6 of 28	5		ENSP00000343634.5		O60500-2

Frequencies

GnomAD3 genomes

AF:

0.0000394

AC:

AN:

152112

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000735

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000796

AC:

AN:

251218

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135796

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000176

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000479

AC:

AN:

1461250

Hom.:

Cov.:

AF XY:

0.0000385

AC XY:

AN XY:

726968

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000603

Gnomad4 OTH exome

AF:

0.0000331

GnomAD4 genome

AF:

0.0000394

AC:

AN:

152112

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74314

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000735

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000264

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:8

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Finnish congenital nephrotic syndrome

Pathogenic:5

Sep 08, 2020

Natera, Inc.

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Mar 09, 2024

Baylor Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Dec 11, 2015

Counsyl

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Feb 19, 2021

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: NPHS1 c.619delC (p.Arg207GlyfsX28) results in a premature termination codon, predicted to cause a truncation of the encoded protein or absence of the protein due to nonsense mediated decay, which are commonly known mechanisms for disease. Truncations downstream of this position have been classified as pathogenic by our laboratory. The variant allele was found at a frequency of 8e-06 in 251218 control chromosomes. c.619delC has been reported in the literature in individuals affected with Nephrotic Syndrome, Type 1 (Machuca_2010, Wong_2013, Berody_2019). To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. One clinical diagnostic laboratory has submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. One laboratory classified the variant as likely pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. -

Mar 27, 2024

Fulgent Genetics, Fulgent Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

NPHS1-related disorder

Pathogenic:1

May 11, 2024

PreventionGenetics, part of Exact Sciences

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

The NPHS1 c.619delC variant is predicted to result in a frameshift and premature protein termination (p.Arg207Glyfs*28). This variant was reported in individuals with nephrotic syndrome (Machuca et al 2010. PubMed ID: 20507940; Bérody et al 2019. PubMed ID: 29474669; Wong et al 2013. PubMed ID: 23949594). This variant is reported in 0.0018% of alleles in individuals of European (Non-Finnish) descent in gnomAD. Frameshift variants in NPHS1 are expected to be pathogenic. This variant is interpreted as pathogenic. -

not provided

Pathogenic:1

Dec 31, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change creates a premature translational stop signal (p.Arg207Glyfs*28) in the NPHS1 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in NPHS1 are known to be pathogenic (PMID: 11317351, 11854170, 12039988). This variant is present in population databases (rs778217926, gnomAD 0.002%). This premature translational stop signal has been observed in individual(s) with NPHS1-related conditions (PMID: 20507940, 29474669). ClinVar contains an entry for this variant (Variation ID: 370188). For these reasons, this variant has been classified as Pathogenic. -

Nephrotic syndrome

Pathogenic:1

Jun 28, 2018

Sydney Genome Diagnostics, Children's Hospital Westmead

Significance: Likely pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

This individual is heterozygous for the c.619del variant in the NPHS1 gene. This frameshifting variant is predicted to create a premature stop codon p.(Arg207Glyfs*28) and may result in a null allele due to nonsense-mediated mRNA decay. This variant has been reported in the gnomAD browser (http://gnomad.broadinstitute.org) with a very low allele frequency of 0.008% (2 out of 246,004 alleles). To our knowledge, this variant has not been previously reported in the literature or any disease specific databases. However, other truncating variants downstream of this amino acid have been described in the ClinVar (https://www.ncbi.nlm.nih.gov/clinvar/?term=NPHS1%5Bgene%5D). This variant is considered to be likely pathogenic according to the ACMG guidelines. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

19-35849642-CGGG-CGG

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over