6-52026027-G-A

Position:

• chr6-52026027-G-A

Variant summary

Our verdict is Benign. Variant got -10 ACMG points: 0P and 10B. BP4_Strong BP6 BP7 BS2

The NM_138694.4(PKHD1):​c.3783C>T​(p.Gly1261=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00103 in 1,614,034 control chromosomes in the GnomAD database, including 3 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. G1261G) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.00097 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0010 (3 hom.)
• Consequence: PKHD1 NM_138694.4 synonymous
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2 B:8
• Conservation: PhyloP100: -2.86

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]

ACMG classification

Verdict is Benign. Variant got -10 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.86).
• BP6: Variant 6-52026027-G-A is Benign according to our data. Variant chr6-52026027-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 262400.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=4, Uncertain_significance=2}. Variant chr6-52026027-G-A is described in Lovd as [Likely_benign].
• BP7: Synonymous conserved (PhyloP=-2.86 with no splicing effect.
• BS2: High Homozygotes in GnomAdExome4 at 3 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PKHD1	NM_138694.4	c.3783C>T	p.Gly1261=	synonymous_variant	32/67	ENST00000371117.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PKHD1	ENST00000371117.8	c.3783C>T	p.Gly1261=	synonymous_variant	32/67	1	NM_138694.4	P2
PKHD1	ENST00000340994.4	c.3783C>T	p.Gly1261=	synonymous_variant	32/61	5		A2

Frequencies

GnomAD3 genomes AF: 0.000973 AC: 148 AN: 152114 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.000266

Gnomad AMI AF: 0.0571

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: 0.00123

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.000583 AC: 146 AN: 250602 Hom.: 0 AF XY: 0.000627 AC XY: 85 AN XY: 135618

Gnomad AFR exome AF: 0.000248

Gnomad AMR exome AF: 0.0000579

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000545

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.000139

Gnomad NFE exome AF: 0.00118

Gnomad OTH exome AF: 0.000491

GnomAD4 exome AF: 0.00104 AC: 1514 AN: 1461802 Hom.: 3 Cov.: 37 AF XY: 0.00106 AC XY: 770 AN XY: 727202

Gnomad4 AFR exome AF: 0.0000597

Gnomad4 AMR exome AF: 0.0000894

Gnomad4 ASJ exome AF: 0.0000383

Gnomad4 EAS exome AF: 0.0000252

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.000225

Gnomad4 NFE exome AF: 0.00131

Gnomad4 OTH exome AF: 0.000546

GnomAD4 genome AF: 0.000972 AC: 148 AN: 152232 Hom.: 0 Cov.: 32 AF XY: 0.00107 AC XY: 80 AN XY: 74442

Gnomad4 AFR AF: 0.000265

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: 0.00124

Gnomad4 OTH AF: 0.00

Alfa AF: 0.00108 Hom.: 0

Bravo AF: 0.00115

EpiCase AF: 0.000981

EpiControl AF: 0.000948

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2 Benign:8

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Uncertain:1 Benign:4

Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Apr 26, 2021	- -
Likely benign, no assertion criteria provided	clinical testing	Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center	-	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Jun 12, 2018	- -
Likely benign, no assertion criteria provided	clinical testing	Genome Diagnostics Laboratory, University Medical Center Utrecht	-	- -
Likely benign, no assertion criteria provided	clinical testing	Laboratory of Diagnostic Genome Analysis, Leiden University Medical Center (LUMC)	-	- -

Autosomal recessive polycystic kidney disease Uncertain:1 Benign:2

Likely benign, no assertion criteria provided	clinical testing	Natera, Inc.	Nov 16, 2017	- -
Likely benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 31, 2024	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 12, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

not specified Benign:2

Likely benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Feb 18, 2022	- -
Likely benign, criteria provided, single submitter	clinical testing	PreventionGenetics, part of Exact Sciences	-	- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.86
CADD	Benign	0.12
DANN	Benign	0.47

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: rs138388301; hg19: chr6-51890825; COSMIC: COSV100582297;