6-52079956-C-T

Position:

chr6-52079956-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The ENST00000371117.8(PKHD1):c.334G>A(p.Gly112Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000672 in 1,612,380 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00036 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00070 ( 1 hom. )

Consequence

PKHD1
ENST00000371117.8 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:9B:1

Conservation

PhyloP100: 0.823

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 Uncertain_significance. Variant got 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.22399563).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PKHD1	NM_138694.4 linkuse as main transcript	c.334G>A	p.Gly112Arg	missense_variant	5/67	ENST00000371117.8	NP_619639.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PKHD1	ENST00000371117.8 linkuse as main transcript	c.334G>A	p.Gly112Arg	missense_variant	5/67	1	NM_138694.4	ENSP00000360158	P2	P08F94-1
PKHD1	ENST00000340994.4 linkuse as main transcript	c.334G>A	p.Gly112Arg	missense_variant	5/61	5		ENSP00000341097	A2	P08F94-2

Frequencies

GnomAD3 genomes

AF:

0.000362

AC:

AN:

152104

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000169

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000192

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000647

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.000342

AC:

AN:

251404

Hom.:

AF XY:

0.000309

AC XY:

AN XY:

135866

show subpopulations

Gnomad AFR exome

AF:

0.000123

Gnomad AMR exome

AF:

0.000173

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.000139

Gnomad NFE exome

AF:

0.000642

Gnomad OTH exome

AF:

0.000326

GnomAD4 exome

AF:

0.000704

AC:

1028

AN:

1460276

Hom.:

Cov.:

AF XY:

0.000696

AC XY:

506

AN XY:

726540

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.000157

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000504

Gnomad4 SAS exome

AF:

0.0000232

Gnomad4 FIN exome

AF:

0.000168

Gnomad4 NFE exome

AF:

0.000880

Gnomad4 OTH exome

AF:

0.000497

GnomAD4 genome

AF:

0.000362

AC:

AN:

152104

Hom.:

Cov.:

AF XY:

0.000337

AC XY:

AN XY:

74290

show subpopulations

Gnomad4 AFR

AF:

0.000169

Gnomad4 AMR

AF:

0.000131

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000192

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000647

Gnomad4 OTH

AF:

0.000478

Alfa

AF:

0.000600

Hom.:

Bravo

AF:

0.000408

TwinsUK

AF:

0.00135

AC:

ALSPAC

AF:

0.00

AC:

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.000581

AC:

ExAC

AF:

0.000338

AC:

EpiCase

AF:

0.000436

EpiControl

AF:

0.000889

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:9Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Autosomal recessive polycystic kidney disease

Uncertain:3Benign:1

Uncertain significance, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Oct 31, 2018	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Counsyl	Dec 07, 2017	- -
Uncertain significance, no assertion criteria provided	clinical testing	Natera, Inc.	May 22, 2018	- -
Likely benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 27, 2024	- -

not provided

Uncertain:3

Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Aug 05, 2022	Reported with additional PKHD1 variants (phase unknown) in a patient with polycystic kidney disease in published literature (Bergmann et al., 2005); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 25525159, 25646624, 33112055, 15698423) -
Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Dec 20, 2017	- -
Uncertain significance, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Nov 01, 2024	PKHD1: PM2:Supporting, BP4 -

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

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

Jan 11, 2021

Variant summary: PKHD1 c.334G>A (p.Gly112Arg) results in a non-conservative amino acid change in the encoded protein sequence. Four of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 0.00034 in 251404 control chromosomes (gnomAD). This frequency is not higher than expected for a pathogenic variant in PKHD1 causing Polycystic Kidney And Hepatic Disease (0.00034 vs 0.0071), allowing no conclusion about variant significance. c.334G>A has been reported in the literature in individuals affected with Polycystic Kidney And Hepatic Disease (e.g. Bergmann_2005, Eisenberger_2015, Dafinger_2020). These reports do not provide unequivocal conclusions about association of the variant with Polycystic Kidney And Hepatic Disease. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Four ClinVar submitters (evaluation after 2014) cite the variant as uncertain significance. Based on the evidence outlined above, the variant was classified as uncertain significance. -

Polycystic kidney disease

Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

Department of Pathology and Laboratory Medicine, Sinai Health System

The PKHD1 p.Gly112Arg variant was identified in 1 of 328 proband chromosomes (frequency: 0.003) from individuals or families with autosomal-recessive polycystic kidney disease (ARPKD; Bergmann 2005). The variant was also identified in dbSNP (ID: rs149841071) as N/A, LOVD 3.0, RWTH AAachen University ARPKD database (classified as pathogenic). The variant was not identified in ClinVar or GeneInsight-COGR databases. The variant was identified in control databases in 95 of 277140 chromosomes at a frequency of 0.0003 increasing the likelihood this could be a low frequency benign variant (Genome Aggregation Consortium Feb 27, 2017). The p.Gly112 residue is not conserved in mammals and computational analyses (PolyPhen-2, SIFT, AlignGVGD, BLOSUM, MutationTaster) provide inconsistent predictions regarding the impact to the protein; this information is not very predictive of pathogenicity. The variant occurs outside of the splicing consensus sequence and 1 of 5 in silico or computational prediction software programs (SpliceSiteFinder, MaxEntScan, NNSPLICE, GeneSplicer, HumanSpliceFinder) predict a greater than 10% difference in splicing; this is not very predictive of pathogenicity. In summary, based on the above information, the clinical significance of this variant cannot be determined with certainty at this time. This variant is classified as a variant of uncertain significance. -

Autosomal dominant polycystic liver disease

Uncertain:1

Uncertain significance, no assertion criteria provided

research

Laboratory of Gastroenterology and Hepatology, Radboud University Medical Center

Sep 01, 2021

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.099

BayesDel_addAF

Benign

-0.15

BayesDel_noAF

Uncertain

-0.030

CADD

Benign

DANN

Benign

0.97

DEOGEN2

Benign

0.34

T;.

Eigen

Benign

-0.51

Eigen_PC

Benign

-0.64

FATHMM_MKL

Benign

0.050

LIST_S2

Benign

0.46

T;T

M_CAP

Uncertain

0.11

MetaRNN

Benign

0.22

T;T

MetaSVM

Benign

-0.75

MutationAssessor

Uncertain

2.6

M;M

MutationTaster

Benign

1.0

N;N

PrimateAI

Benign

0.36

PROVEAN

Uncertain

-3.0

D;D

REVEL

Uncertain

0.54

Sift

Uncertain

0.021

D;D

Sift4G

Benign

0.13

T;T

Polyphen

0.95

P;P

Vest4

0.37

MutPred

0.86

Gain of catalytic residue at G112 (P = 0.0553);Gain of catalytic residue at G112 (P = 0.0553);

MVP

0.92

MPC

0.089

ClinPred

0.046

GERP RS

2.6

Varity_R

0.081

gMVP

0.65

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