rs2432403

Positions:

• chr16-2106599-G-A

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_001009944.3(PKD1):​c.7288C>T​(p.Arg2430Ter) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000138 in 1,445,828 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: PKD1 NM_001009944.3 stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:7
• Conservation: PhyloP100: 2.98

Genes affected

PKD1 (HGNC:9008): (polycystin 1, transient receptor potential channel interacting) This gene encodes a member of the polycystin protein family. The encoded glycoprotein contains a large N-terminal extracellular region, multiple transmembrane domains and a cytoplasmic C-tail. It is an integral membrane protein that functions as a regulator of calcium permeable cation channels and intracellular calcium homoeostasis. It is also involved in cell-cell/matrix interactions and may modulate G-protein-coupled signal-transduction pathways. It plays a role in renal tubular development, and mutations in this gene cause autosomal dominant polycystic kidney disease type 1 (ADPKD1). ADPKD1 is characterized by the growth of fluid-filled cysts that replace normal renal tissue and result in end-stage renal failure. Splice variants encoding different isoforms have been noted for this gene. Also, six pseudogenes, closely linked in a known duplicated region on chromosome 16p, have been described. [provided by RefSeq, Oct 2008]

ACMG classification

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 16-2106599-G-A is Pathogenic according to our data. Variant chr16-2106599-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 562262.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr16-2106599-G-A is described in Lovd as [Pathogenic]. Variant chr16-2106599-G-A is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PKD1	NM_001009944.3	c.7288C>T	p.Arg2430Ter	stop_gained	18/46	ENST00000262304.9	NP_001009944.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PKD1	ENST00000262304.9	c.7288C>T	p.Arg2430Ter	stop_gained	18/46	1	NM_001009944.3	ENSP00000262304	P5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000138 AC: 2 AN: 1445828 Hom.: 0 Cov.: 33 AF XY: 0.00000278 AC XY: 2 AN XY: 719842

Gnomad4 AFR exome AF: 0.00

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: 0.00000180

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:7

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Polycystic kidney disease, adult type Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Juno Genomics, Hangzhou Juno Genomics, Inc	Jul 19, 2024	PM2_Supporting+PVS1+PS4_Moderate+PP4 -
Pathogenic, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Apr 11, 2022	- -

not provided Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Apr 03, 2023	Nonsense variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss-of-function is a known mechanism of disease; Not observed in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 25525159, 27782177, 31740684, 36082560, 33102977, 33437033, 30586318, 33226606, 30816285, 11012875) -
Pathogenic, no assertion criteria provided	research	Gharavi Laboratory, Columbia University	Sep 16, 2018	- -

Polycystic kidney disease Pathogenic:1

Pathogenic, no assertion criteria provided

clinical testing

Department of Pathology and Laboratory Medicine, Sinai Health System

-

The PKD1 p.Arg2430X variant was identified in 14 of 2964 proband chromosomes (frequency: 0.005) from American, British, French, Thai, Korean and Chinese individuals or families with ADPKD (Yu 2011, Rossetti 2012, Rossetti 2007, Rossetti 2001, Phakdeekitcharoen 2000, Audrezet 2012, Garcia-Gonzalez 2007). The variant was also identified in dbSNP (ID: rs2432403) with “NA” allele, and the ADPKD Mutation Database (definitely pathogenic). The variant was not identified in ClinVar, COGR, LOVD 3.0, PKD1-LOVD, the 1000 Genomes Project, the NHLBI GO Exome Sequencing Project or the Exome Aggregation Consortium (August 8th 2016) control databases. The p.Arg2430X variant leads to a premature stop codon at position 2430, which is predicted to lead to a truncated or absent protein and loss of function. Loss of function variants of the PKD1 gene are an established mechanism of disease in autosomal dominant polycystic kidney disease and is the type of variant expected to cause the disorder. In summary, based on the above information this variant meets our laboratory’s criteria to be classified as pathogenic. -

Autosomal dominant polycystic kidney disease Pathogenic:1

Pathogenic, criteria provided, single submitter

research

Molecular Genetics of Inherited Kidney Disorders Laboratory, Garvan Institute of Medical Research

Jan 01, 2019

- -

PKD1-related disorder Pathogenic:1

Pathogenic, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

May 28, 2024

The PKD1 c.7288C>T variant is predicted to result in premature protein termination (p.Arg2430*). This variant has been reported to be pathogenic for autosomal dominant polycystic kidney disease (ADPKD) (see for example Table 3 and Supp. Table S4. in Audrézet et al. 2012. PubMed ID: 22508176). This variant has not been reported in a large population database, indicating this variant is rare. Nonsense variants in PKD1 are expected to be pathogenic. This variant is interpreted as pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.58
CADD	Pathogenic	42
DANN	Uncertain	0.99
Eigen	Uncertain	0.52
Eigen_PC	Uncertain	0.31
FATHMM_MKL	Uncertain	0.82	D
MutationTaster	Benign	1.0	A;A
Vest4		0.82
GERP RS		3.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.050		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

Other links and lift over

dbSNP: rs2432403; hg19: chr16-2156600;