chr6-52043020-G-A

Position:

chr6-52043020-G-A

Variant summary

Our verdict is Likely pathogenic. Variant got 9 ACMG points: 9P and 0B. PM1PM2PP3_StrongPP5

The NM_138694.4(PKHD1):c.2936C>T(p.Thr979Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000551 in 1,613,920 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000060 ( 1 hom. )

Consequence

PKHD1
NM_138694.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:4U:1

Conservation

PhyloP100: 2.80

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 Likely_pathogenic. Variant got 9 ACMG points.

PM1

In a domain IPT/TIG 4 (size 84) in uniprot entity PKHD1_HUMAN there are 5 pathogenic changes around while only 1 benign (83%) in NM_138694.4

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.98

PP5

Variant 6-52043020-G-A is Pathogenic according to our data. Variant chr6-52043020-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 553118.We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=1, Uncertain_significance=1, Pathogenic=3}. Variant chr6-52043020-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PKHD1	NM_138694.4 linkuse as main transcript	c.2936C>T	p.Thr979Ile	missense_variant	27/67	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.2936C>T	p.Thr979Ile	missense_variant	27/67	1	NM_138694.4	ENSP00000360158	P2	P08F94-1
PKHD1	ENST00000340994.4 linkuse as main transcript	c.2936C>T	p.Thr979Ile	missense_variant	27/61	5		ENSP00000341097	A2	P08F94-2

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152176

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:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000159

AC:

AN:

251126

Hom.:

AF XY:

0.0000221

AC XY:

AN XY:

135704

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:

0.0000353

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000595

AC:

AN:

1461744

Hom.:

Cov.:

AF XY:

0.0000454

AC XY:

AN XY:

727176

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

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:

0.0000764

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152176

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74348

show subpopulations

Gnomad4 AFR

AF:

0.00

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:

0.0000294

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000325

Hom.:

Bravo

AF:

0.0000189

ExAC

AF:

0.0000247

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.0000593

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:4Uncertain:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Autosomal recessive polycystic kidney disease

Pathogenic:3Uncertain:1

Likely pathogenic, criteria provided, single submitter	clinical testing	Victorian Clinical Genetics Services, Murdoch Childrens Research Institute	Jun 21, 2018	A heterozygous missense variant, NM_138694.3(PKHD1):c.2936C>T, has been identified in exon 27 of 67 of the PKHD1 gene. The variant is predicted to result in a moderate amino acid change from threonine to isoleucine at position 979 of the protein (NP_619639.3(PKHD1):p.(Thr979Ile)). The threonine residue at this position has low conservation (100 vertebrates, UCSC), and is located within the IPT/TIG domain. In silico predictions for this variant are consistently pathogenic (Polyphen, SIFT, CADD, Mutation Taster). The variant is present in the gnomAD database at a frequency of 0.001% (4/245860 heterozygotes and 0 homozygote). The variant has previously been described as pathogenic in patients with polycystic kidney disease, where a second variant in trans has also been identified (Losekoot M. et al. (2005), Adeva M. et al. (2006)). Based on the information available at the time of curation, this variant has been classified as LIKELY PATHOGENIC. The presence of these two variants suggests a possible compound heterozygous mode of inheritance which is consistent with polycystic kidney disease. -
Uncertain significance, criteria provided, single submitter	clinical testing	Counsyl	Jul 27, 2017	- -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 28, 2024	This sequence change replaces threonine, which is neutral and polar, with isoleucine, which is neutral and non-polar, at codon 979 of the PKHD1 protein (p.Thr979Ile). This variant is present in population databases (rs747895516, gnomAD 0.004%). This missense change has been observed in individuals with autosomal recessive polycystic kidney disease (PMID: 16133180, 16523049, 32939031). ClinVar contains an entry for this variant (Variation ID: 553118). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt PKHD1 protein function with a positive predictive value of 95%. For these reasons, this variant has been classified as Pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	-	- -

Polycystic kidney disease 4

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Baylor Genetics

Mar 29, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.51

BayesDel_addAF

Pathogenic

0.28

BayesDel_noAF

Pathogenic

0.27

CADD

Uncertain

DANN

Pathogenic

1.0

DEOGEN2

Pathogenic

0.83

D;.

Eigen

Uncertain

0.67

Eigen_PC

Uncertain

0.62

FATHMM_MKL

Uncertain

0.93

LIST_S2

Benign

0.82

T;T

M_CAP

Uncertain

0.18

MetaRNN

Pathogenic

0.98

D;D

MetaSVM

Uncertain

0.34

MutationAssessor

Uncertain

2.6

M;M

MutationTaster

Benign

0.77

D;D

PrimateAI

Uncertain

0.59

PROVEAN

Pathogenic

-4.9

D;D

REVEL

Pathogenic

0.65

Sift

Uncertain

0.0020

D;D

Sift4G

Uncertain

0.0020

D;D

Polyphen

1.0

D;D

Vest4

0.73

MutPred

0.84

Gain of sheet (P = 0.0477);Gain of sheet (P = 0.0477);

MVP

0.99

MPC

0.38

ClinPred

0.92

GERP RS

6.0

Varity_R

0.87

gMVP

0.81

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.040

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