16-2106877-G-C

Position:

• chr16-2106877-G-C

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_001009944.3(PKD1):​c.7137C>G​(p.Tyr2379Ter) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 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)
• Consequence: PKD1 NM_001009944.3 stop_gained
• Clinical Significance: Pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: -0.500

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 12 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 16-2106877-G-C is Pathogenic according to our data. Variant chr16-2106877-G-C is described in ClinVar as [Pathogenic]. Clinvar id is 433977.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr16-2106877-G-C is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PKD1	NM_001009944.3	c.7137C>G	p.Tyr2379Ter	stop_gained	17/46	ENST00000262304.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PKD1	ENST00000262304.9	c.7137C>G	p.Tyr2379Ter	stop_gained	17/46	1	NM_001009944.3	P5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

Polycystic kidney disease, adult type Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Jan 28, 2022

- -

Polycystic kidney disease Pathogenic:1

Pathogenic, no assertion criteria provided

clinical testing

Department of Pathology and Laboratory Medicine, Sinai Health System

-

The PKD1 p.Tyr2379X variant was identified in 3 of 1400 proband chromosomes (frequency: 0.002) from individuals or families with family history of ADPKD (Audrézet 2012) and classified as a definitively pathogenic mutation. The variant was also identified in ADPKD Mutation Database (classified as definitely pathogenic). The variant was not identified in dbSNP, Clinvitae, ClinVar, GeneInsight COGR, MutDB, PKD1-LOVD, PKD1-LOVD 3.0, NHLBI GO Exome Sequencing Project and the Exome Aggregation Consortium database (August 8, 2016). The p.Tyr2379X variant leads to a premature stop codon at position 2379, 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.46
CADD	Pathogenic	34
DANN	Uncertain	0.99
Eigen	Benign	0.018
Eigen_PC	Benign	-0.29
FATHMM_MKL	Benign	0.23	N
MutationTaster	Benign	1.0	A;A
Vest4		0.94
GERP RS		-4.7

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

Other links and lift over

dbSNP: rs752114168; hg19: chr16-2156878;