chr6-51648115-G-A

Variant names:

Variant summary

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

The NM_138694.4(PKHD1):c.11314C>T(p.Arg3772*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000633 in 1,580,332 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 Likely pathogenic (★★). Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000063 ( 0 hom. )

Consequence

PKHD1
NM_138694.4 stop_gained

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:10

Conservation

PhyloP100: 0.532

Variant links:

Genes affected

PKHD1 (HGNC:9016): (PKHD1 ciliary IPT domain containing fibrocystin/polyductin) The protein encoded by this gene is predicted to have a single transmembrane (TM)-spanning domain and multiple copies of an immunoglobulin-like plexin-transcription-factor domain. Alternative splicing results in two transcript variants encoding different isoforms. Other alternatively spliced transcripts have been described, but the full length sequences have not been determined. Several of these transcripts are predicted to encode truncated products which lack the TM and may be secreted. Mutations in this gene cause autosomal recessive polycystic kidney disease, also known as polycystic kidney and hepatic disease-1. [provided by RefSeq, Jul 2008]

PKHD1 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 6-51648115-G-A is Pathogenic according to our data. Variant chr6-51648115-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 370289.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr6-51648115-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PKHD1	NM_138694.4 link	c.11314C>T	p.Arg3772*	stop_gained	Exon 63 of 67	ENST00000371117.8	NP_619639.3	P08F94-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PKHD1	ENST00000371117.8 link	c.11314C>T	p.Arg3772*	stop_gained	Exon 63 of 67	1	NM_138694.4	ENSP00000360158.3		P08F94-1

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152132

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000193

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000399

AC:

AN:

250698

Hom.:

AF XY:

0.00000738

AC XY:

AN XY:

135464

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000544

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000630

AC:

AN:

1428200

Hom.:

Cov.:

AF XY:

0.00000421

AC XY:

AN XY:

712722

show subpopulations

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:

0.0000234

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000647

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152132

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74298

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000193

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000378

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:10

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Autosomal recessive polycystic kidney disease

Pathogenic:5

Nov 04, 2024

Molecular Genetics, Royal Melbourne Hospital

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change in PKHD1 is a nonsense variant predicted to create a premature stop codon, p.(Arg3772*), in biologically relevant exon 63/67 leading to nonsense-mediated decay in a gene in which loss-of-function is an established disease mechanism (PMID: 20301501). Loss-of-function variants are a well-established cause of disease in exon 63 (ClinVar). The highest population minor allele frequency in the population database gnomAD v4.1 is 0.002% (1/44,724 alleles) in the East Asian population. This variant has been detected as homozygous and compound heterozygous in at least four unrelated individuals with autosomal recessive polycystic kidney disease, with at least one pathogenic variant confirmed on the second allele (PMID: 27225849, 15108281, 33123899, 35783601). Based on the classification scheme RMH Modified ACMG/AMP Guidelines v1.7.0, this variant is classified as PATHOGENIC. Following criteria are met: PVS1, PM3_Strong, PM2_Supporting, PM5_Supporting. -

May 29, 2017

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

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: The PKHD1 c.11314C>T (p.Arg3772X) variant results in a premature termination codon, predicted to cause a truncated or absent PKHD1 protein due to nonsense mediated decay, which are commonly known mechanisms for disease. Truncations downstream of this position have been classified as likely pathogenic in ClinVar (e.g. p.Arg3842Ter and c.11776delG (p.Val3926Trpfs)). This variant is absent in 121176 control chromosomes from ExAC. This variant has been reported in five patients from four ARPKD families (Bergmann_2004, Melchionda_2016; Li_2016), in homozygous state and in compound heterozygous state with known, c.9689delA (p.Asp3230fs) and presumably pathogenic, c.889T>A (p.Cys297Ser) variants. Parents were genotyped in both families and variant transmission in affected offspring's was consistent with disease inheritance. One clinical diagnostic laboratory has classified this variant as likely pathogenic. Taken together, this variant is classified as pathogenic. -

Jan 04, 2016

Counsyl

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Aug 09, 2017

Natera, Inc.

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Feb 23, 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.Arg3772*) in the PKHD1 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in PKHD1 are known to be pathogenic (PMID: 19940839). This variant is present in population databases (rs199839578, gnomAD 0.01%). This premature translational stop signal has been observed in individual(s) with polycystic kidney disease (PMID: 15108281, 27225849, 27577217). ClinVar contains an entry for this variant (Variation ID: 370289). For these reasons, this variant has been classified as Pathogenic. -

Polycystic kidney disease 4

Pathogenic:4

Mar 08, 2024

Fulgent Genetics, Fulgent Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jan 01, 2024

Daryl Scott Lab, Baylor College of Medicine

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

PVS1, PS4, PM3 -

Jan 31, 2024

Baylor Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Juno Genomics, Hangzhou Juno Genomics, Inc

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

PM2_Supporting+PVS1+PM3_VeryStrong -

Inborn genetic diseases

Pathogenic:1

Mar 12, 2025

Ambry Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.11314C>T (p.R3772*) alteration, located in exon 63 (coding exon 62) of the PKHD1 gene, consists of a C to T substitution at nucleotide position 11314. This changes the amino acid from a arginine (R) to a stop codon at amino acid position 3772. This alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. Based on data from gnomAD, the T allele has an overall frequency of 0.001% (2/282092) total alleles studied. The highest observed frequency was 0.01% (2/19942) of East Asian alleles. This variant has been identified in the homozygous state and in conjunction with other PKHD1 variants in individuals with features consistent with PKHD1-related polycystic kidney disease; in at least one instance, the variants were identified in trans (Ding, 2024; Shi, 2023; Melchionda, 2016; Bergmann, 2004). Based on the available evidence, this alteration is classified as pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.51

BayesDel_noAF

Pathogenic

0.52

CADD

Pathogenic

DANN

Uncertain

0.99

Eigen

Uncertain

0.42

Eigen_PC

Benign

0.19

FATHMM_MKL

Benign

0.25

Vest4

0.89

GERP RS

2.3

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.

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