rs1555459108

chr16-2118129-TGGCCAGA-T

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.856_862del(p.Gly287Ter) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★★). Synonymous variant affecting the same amino acid position (i.e. S286S) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: PKD1 NM_001009944.3 frameshift
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:8
• Conservation: PhyloP100: 2.23

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 16-2118129-TGGCCAGA-T is Pathogenic according to our data. Variant chr16-2118129-TGGCCAGA-T is described in ClinVar as [Pathogenic]. Clinvar id is 448020.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr16-2118129-TGGCCAGA-T is described in Lovd as [Pathogenic]. Variant chr16-2118129-TGGCCAGA-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PKD1	NM_001009944.3	c.856_862del	p.Gly287Ter	frameshift_variant	5/46	ENST00000262304.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PKD1	ENST00000262304.9	c.856_862del	p.Gly287Ter	frameshift_variant	5/46	1	NM_001009944.3	P5
PKD1	ENST00000423118.5	c.856_862del	p.Gly287Ter	frameshift_variant	5/46	1		A2
PKD1	ENST00000570150.1			upstream_gene_variant		5

Frequencies

GnomAD3 genomes Cov.: 32

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:8

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Polycystic kidney disease, adult type Pathogenic:3

Pathogenic, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Feb 23, 2022	- -
Pathogenic, criteria provided, single submitter	clinical testing	Centre for Mendelian Genomics, University Medical Centre Ljubljana	May 31, 2019	This variant was classified as: Pathogenic. The following ACMG criteria were applied in classifying this variant: PVS1,PM2,PP5. -
Pathogenic, criteria provided, single submitter	research	Molecular Biology Laboratory, Fundació Puigvert	Feb 01, 2020	- -

not provided Pathogenic:3

Pathogenic, criteria provided, single submitter	clinical testing	Athena Diagnostics	Sep 30, 2016	- -
Pathogenic, criteria provided, single submitter	clinical testing	Molecular Genetics of Inherited Kidney Disorders Laboratory, Garvan Institute of Medical Research	Jan 01, 2019	- -
Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Dec 22, 2021	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: 33168999, 30816285, 33437033, 21694639, 30333007, 31160911, 31740684, 22508176, 27499327, 33532864) -

Polycystic kidney disease Pathogenic:1

Pathogenic, no assertion criteria provided

clinical testing

Department of Pathology and Laboratory Medicine, Sinai Health System

-

The PKD1 p.Gly287* variant was identified in 7 of 2014 proband chromosomes (frequency: 0.003) from individuals or families with ADPKD and congenital hepatic fibrosis (CHF) (Audrezet 2012, O'Brien 2012, Hwang 2016). The variant was also identified in the following databases: LOVD 3.0 (1x as "affects function") and ADPKD Mutation Database (6x as definitely pathogenic). The variant was not identified in dbSNP, ClinVar, or PKD1-LOVD. The variant was not identified in the 1000 Genomes Project, the NHLBI GO Exome Sequencing Project or the Exome Aggregation Consortium (August 8th 2016). The c.856_862del variant is predicted to cause a frameshift, which alters the protein amino acid sequence beginning at codon 287 and leads to a premature stop codon 1 codon downstream. This alteration is then predicted to result in a truncated or absent protein and loss of function. Loss of function variants of the PKD1 gene are an established mechanism of disease in ADPKD 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. -

PKD1-related disorder Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Feb 16, 2024

The PKD1 c.856_862del7 variant is predicted to result in premature protein termination (p.Gly287*). This variant has been reported to be pathogenic for autosomal dominant polycystic kidney disease (ADPKD) (see for example, O'Brien et al. 2012. PubMed ID: 21694639; Bitarafan et al. 2019. PubMed ID: 31160911). This variant has not been reported in a large population database (http://gnomad.broadinstitute.org), 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

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs1555459108; hg19: chr16-2168130;