6-52072173-C-T

Position:

chr6-52072173-C-T

Variant summary

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

The NM_138694.4(PKHD1):c.544G>A(p.Ala182Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000722 in 1,605,888 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000026 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000077 ( 0 hom. )

Consequence

PKHD1
NM_138694.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:4

Conservation

PhyloP100: 0.890

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:

LOC124901327 (HGNC:):

LOC124901327 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=0.2535814).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PKHD1	NM_138694.4 link	c.544G>A	p.Ala182Thr	missense_variant	8/67	ENST00000371117.8	NP_619639.3	P08F94-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PKHD1	ENST00000371117.8 link	c.544G>A	p.Ala182Thr	missense_variant	8/67	1	NM_138694.4	ENSP00000360158.3		P08F94-1
PKHD1	ENST00000340994.4 link	c.544G>A	p.Ala182Thr	missense_variant	8/61	5		ENSP00000341097.4		P08F94-2

Frequencies

GnomAD3 genomes

AF:

0.0000263

AC:

AN:

152052

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000441

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000239

AC:

AN:

251002

Hom.:

AF XY:

0.0000221

AC XY:

AN XY:

135640

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000441

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.0000770

AC:

112

AN:

1453836

Hom.:

Cov.:

AF XY:

0.0000691

AC XY:

AN XY:

723910

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:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000996

Gnomad4 OTH exome

AF:

0.0000333

GnomAD4 genome

AF:

0.0000263

AC:

AN:

152052

Hom.:

Cov.:

AF XY:

0.0000404

AC XY:

AN XY:

74274

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000441

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000824

Hom.:

Bravo

AF:

0.0000378

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.0000330

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Autosomal recessive polycystic kidney disease

Uncertain:2

Uncertain significance, no assertion criteria provided	clinical testing	Natera, Inc.	Jul 27, 2018	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Sep 01, 2021	This sequence change replaces alanine with threonine at codon 182 of the PKHD1 protein (p.Ala182Thr). The alanine residue is weakly conserved and there is a small physicochemical difference between alanine and threonine. This variant is present in population databases (rs142346881, ExAC 0.006%). This variant has not been reported in the literature in individuals affected with PKHD1-related conditions. ClinVar contains an entry for this variant (Variation ID: 161826). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

May 08, 2023

The c.544G>A (p.A182T) alteration is located in exon 8 (coding exon 7) of the PKHD1 gene. This alteration results from a G to A substitution at nucleotide position 544, causing the alanine (A) at amino acid position 182 to be replaced by a threonine (T). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Malignant tumor of prostate

Uncertain:1

Uncertain significance, no assertion criteria provided

literature only

Science for Life laboratory, Karolinska Institutet

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.097

BayesDel_addAF

Benign

-0.053

BayesDel_noAF

Benign

-0.18

CADD

Benign

DANN

Uncertain

0.99

DEOGEN2

Benign

0.22

T;.

Eigen

Benign

-0.082

Eigen_PC

Benign

-0.011

FATHMM_MKL

Uncertain

0.87

LIST_S2

Benign

0.81

T;T

M_CAP

Benign

0.059

MetaRNN

Benign

0.25

T;T

MetaSVM

Benign

-0.68

MutationAssessor

Benign

2.0

M;M

PrimateAI

Benign

0.34

PROVEAN

Benign

-1.5

N;N

REVEL

Uncertain

0.38

Sift

Uncertain

0.028

D;D

Sift4G

Benign

0.17

T;T

Polyphen

0.68

P;P

Vest4

0.27

MVP

0.91

MPC

0.36

ClinPred

0.64

GERP RS

4.1

Varity_R

0.11

gMVP

0.56

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

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