6-51747777-A-C

Position:

• chr6-51747777-A-C

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BS1 BS2

The NM_138694.4(PKHD1):​c.9829+10T>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000941 in 1,611,812 control chromosomes in the GnomAD database, including 10 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0047 (5 hom., cov: 32)
  • Exomes 𝑓: 0.00054 (5 hom.)
• Consequence: PKHD1 NM_138694.4 intron
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:8
• Conservation: PhyloP100: 1.08

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 -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.86).
• BP6: Variant 6-51747777-A-C is Benign according to our data. Variant chr6-51747777-A-C is described in ClinVar as [Likely_benign]. Clinvar id is 167476.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr6-51747777-A-C is described in Lovd as [Benign].
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00475 (723/152286) while in subpopulation AFR AF= 0.0164 (683/41568). AF 95% confidence interval is 0.0154. There are 5 homozygotes in gnomad4. There are 349 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 5 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PKHD1	NM_138694.4	c.9829+10T>G		intron_variant		ENST00000371117.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PKHD1	ENST00000371117.8	c.9829+10T>G		intron_variant		1	NM_138694.4	P2
PKHD1	ENST00000340994.4	c.9829+10T>G		intron_variant		5		A2

Frequencies

GnomAD3 genomes AF: 0.00472 AC: 718 AN: 152168 Hom.: 4 Cov.: 32

Gnomad AFR AF: 0.0164

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00223

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: 0.00191

GnomAD3 exomes AF: 0.00135 AC: 338 AN: 250992 Hom.: 4 AF XY: 0.000995 AC XY: 135 AN XY: 135658

Gnomad AFR exome AF: 0.0167

Gnomad AMR exome AF: 0.00125

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000653

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000115

Gnomad OTH exome AF: 0.00147

GnomAD4 exome AF: 0.000543 AC: 793 AN: 1459526 Hom.: 5 Cov.: 32 AF XY: 0.000452 AC XY: 328 AN XY: 726256

Gnomad4 AFR exome AF: 0.0171

Gnomad4 AMR exome AF: 0.00148

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000348

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000441

Gnomad4 OTH exome AF: 0.00143

GnomAD4 genome AF: 0.00475 AC: 723 AN: 152286 Hom.: 5 Cov.: 32 AF XY: 0.00469 AC XY: 349 AN XY: 74454

Gnomad4 AFR AF: 0.0164

Gnomad4 AMR AF: 0.00222

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: 0.00189

Alfa AF: 0.00393 Hom.: 1

Bravo AF: 0.00538

Asia WGS AF: 0.00318 AC: 11 AN: 3478

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:8

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Autosomal recessive polycystic kidney disease Benign:3

Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 31, 2024	- -
Benign, no assertion criteria provided	clinical testing	Natera, Inc.	May 11, 2017	- -
Likely benign, 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 and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

not provided Benign:3

Benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Apr 26, 2016	Variant summary: The PKHD1 c.9829+10T>G variant affects a non-conserved intronic nucleotide. Mutation Taster predicts benign outcome for this variant, and 5/5/ in silico tools via Alamut predict no significant change to splicing. Functional studies have not been carried out to confirm these in silico predictions. This variant was found in 199/121356 control chromosomes at a frequency of 0.0016398,predominantly in individuals of African descent (1.65%), including 2 homozygous occurrences. This frequency exceeds the maximal expected allele frequency for a pathogenic variant in PKHD1 gene (0.7%). The variant has been reported as a polymorphism identified in controls, and has been reported in only one ARPKD patient without evidence of causality (i.e. co-segregation). Additionally, one clinical lab has classified the variant as benign. Taken together, the variant was classified as benign. -
Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Feb 04, 2019	- -
Likely benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -

not specified Benign:2

Benign, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Jan 14, 2014	- -
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	4.5
DANN	Benign	0.40

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs143526199; hg19: chr6-51612575;