rs151095649

Positions:

• chr16-2097245-G-A
• chr16-2097245-G-C

Variant summary

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

The NM_001009944.3(PKD1):​c.10406-4C>T variant causes a splice region, splice polypyrimidine tract, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000356 in 1,591,888 control chromosomes in the GnomAD database, including 4 homozygotes. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0022 (3 hom., cov: 33)
  • Exomes 𝑓: 0.00016 (1 hom.)
• Consequence: PKD1 NM_001009944.3 splice_region, splice_polypyrimidine_tract, intron
• Scores: Splicing: ADA: 0.00007792
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:6
• Conservation: PhyloP100: -0.124

Genes affected

PKD1 (HGNC:9008): (polycystin 1, transient receptor potential channel interacting) This gene encodes a member of the polycystin protein family. The encoded glycoprotein contains a large N-terminal extracellular region, multiple transmembrane domains and a cytoplasmic C-tail. It is an integral membrane protein that functions as a regulator of calcium permeable cation channels and intracellular calcium homoeostasis. It is also involved in cell-cell/matrix interactions and may modulate G-protein-coupled signal-transduction pathways. It plays a role in renal tubular development, and mutations in this gene cause autosomal dominant polycystic kidney disease type 1 (ADPKD1). ADPKD1 is characterized by the growth of fluid-filled cysts that replace normal renal tissue and result in end-stage renal failure. Splice variants encoding different isoforms have been noted for this gene. Also, six pseudogenes, closely linked in a known duplicated region on chromosome 16p, have been described. [provided by RefSeq, Oct 2008]

ACMG classification

Verdict is Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.86).
• BP6: Variant 16-2097245-G-A is Benign according to our data. Variant chr16-2097245-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 256890.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr16-2097245-G-A is described in Lovd as [Likely_benign]. Variant chr16-2097245-G-A is described in Lovd as [Benign].
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.0022 (335/152306) while in subpopulation AFR AF= 0.00785 (326/41550). AF 95% confidence interval is 0.00714. There are 3 homozygotes in gnomad4. There are 159 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.
• BS2: High AC in GnomAd4 at 335 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PKD1	NM_001009944.3	c.10406-4C>T		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant		ENST00000262304.9	NP_001009944.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PKD1	ENST00000262304.9	c.10406-4C>T		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant		1	NM_001009944.3	ENSP00000262304	P5
PKD1	ENST00000423118.5	c.10403-4C>T		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant		1		ENSP00000399501	A2
PKD1	ENST00000487932.5	c.*1599-4C>T		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant, NMD_transcript_variant		5		ENSP00000457132

Frequencies

GnomAD3 genomes AF: 0.00220 AC: 335 AN: 152188 Hom.: 3 Cov.: 33

Gnomad AFR AF: 0.00787

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000262

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: 0.00

Gnomad OTH AF: 0.00239

GnomAD3 exomes AF: 0.000467 AC: 99 AN: 211824 Hom.: 0 AF XY: 0.000384 AC XY: 44 AN XY: 114450

Gnomad AFR exome AF: 0.00722

Gnomad AMR exome AF: 0.000197

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: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.000160 AC: 231 AN: 1439582 Hom.: 1 Cov.: 32 AF XY: 0.000143 AC XY: 102 AN XY: 714216

Gnomad4 AFR exome AF: 0.00623

Gnomad4 AMR exome AF: 0.000267

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: 0.00

Gnomad4 OTH exome AF: 0.000218

GnomAD4 genome AF: 0.00220 AC: 335 AN: 152306 Hom.: 3 Cov.: 33 AF XY: 0.00214 AC XY: 159 AN XY: 74472

Gnomad4 AFR AF: 0.00785

Gnomad4 AMR AF: 0.000261

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00237

Alfa AF: 0.00131 Hom.: 0

Bravo AF: 0.00246

Asia WGS AF: 0.000289 AC: 1 AN: 3478

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:6

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Polycystic kidney disease, adult type Benign:2

Benign, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Dec 24, 2018	- -
Likely benign, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Aug 13, 2021	- -

not provided Benign:2

Benign, criteria provided, single submitter	clinical testing	Athena Diagnostics	Mar 18, 2019	- -
Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Dec 01, 2022	PKD1: BP4, BS2 -

not specified Benign:1

Benign, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

-

- -

Polycystic kidney disease Benign:1

Benign, no assertion criteria provided

clinical testing

Department of Pathology and Laboratory Medicine, Sinai Health System

-

The PKD1 c.10406-4C>T variant was identified in 1 of 74 proband chromosomes (frequency: 0.01) from French individuals or families with ADPKD (Bataille 2011). The variant was also identified in dbSNP (ID: rs151095649) “With Benign allele”, ClinVar (classified benign by Prevention Genetics), and ADPKD Mutation Database (classified as likely neutral) databases. The variant was not identified in LOVD 3.0 and PKD1-LOVD databases. The variant was identified in control databases in 153 of 238026 chromosomes at a frequency of 0.0006 increasing the likelihood this could be a low frequency benign variant (Genome Aggregation Database Feb 27, 2017). The variant was observed in the following populations: African in 147 of 20668 chromosomes (freq: 0.007), Other in 1 of 5750 chromosomes (freq: 0.0002), Latino in 5 of 30522 chromosomes (freq: 0.0002), while not observed in the European Non-Finnish, Ashkenazi Jewish, East Asian, European Finnish, and South Asian populations. The c.10406-4C>T variant is located in the 3' splice region but does not affect the invariant -1 and -2 positions. However, positions -3 and -5 to -12 are part of the splicing consensus sequence and variants involving these positions sometimes affect splicing. In silico or computational prediction software programs (SpliceSiteFinder, MaxEntScan, NNSPLICE, GeneSplicer) do not predict a difference in splicing. In summary, based on the above information this variant meets our laboratory criteria to be classified as benign. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.86
CADD	Benign	1.1
DANN	Benign	0.37

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.000078
dbscSNV1_RF	Benign	0.0040
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: rs151095649; hg19: chr16-2147246;