4-88075950-C-T

Position:

• chr4-88075950-C-T

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BA1

The NM_000297.4(PKD2):​c.*256C>T variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.145 in 460,598 control chromosomes in the GnomAD database, including 6,111 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.14 (1749 hom., cov: 32)
  • Exomes 𝑓: 0.15 (4362 hom.)
• Consequence: PKD2 NM_000297.4 3_prime_UTR
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:3
• Conservation: PhyloP100: 0.0690

Genes affected

PKD2 (HGNC:9009): (polycystin 2, transient receptor potential cation channel) This gene encodes a member of the polycystin protein family. The encoded protein is a multi-pass membrane protein that functions as a calcium permeable cation channel, and is involved in calcium transport and calcium signaling in renal epithelial cells. This protein interacts with polycystin 1, and they may be partners in a common signaling cascade involved in tubular morphogenesis. Mutations in this gene are associated with autosomal dominant polycystic kidney disease type 2. [provided by RefSeq, Mar 2011]

ACMG classification

Verdict is Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.89).
• BP6: Variant 4-88075950-C-T is Benign according to our data. Variant chr4-88075950-C-T is described in ClinVar as [Benign]. Clinvar id is 350037.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.449 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PKD2	NM_000297.4	c.*256C>T		3_prime_UTR_variant	15/15	ENST00000237596.7	NP_000288.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PKD2	ENST00000237596.7	c.*256C>T		3_prime_UTR_variant	15/15	1	NM_000297.4	ENSP00000237596.2

Frequencies

GnomAD3 genomes AF: 0.135 AC: 20504 AN: 151886 Hom.: 1746 Cov.: 32

Gnomad AFR AF: 0.127

Gnomad AMI AF: 0.0903

Gnomad AMR AF: 0.164

Gnomad ASJ AF: 0.136

Gnomad EAS AF: 0.464

Gnomad SAS AF: 0.143

Gnomad FIN AF: 0.130

Gnomad MID AF: 0.0854

Gnomad NFE AF: 0.110

Gnomad OTH AF: 0.123

GnomAD4 exome AF: 0.150 AC: 46170 AN: 308594 Hom.: 4362 Cov.: 0 AF XY: 0.150 AC XY: 24731 AN XY: 164514

Gnomad4 AFR exome AF: 0.133

Gnomad4 AMR exome AF: 0.221

Gnomad4 ASJ exome AF: 0.132

Gnomad4 EAS exome AF: 0.438

Gnomad4 SAS exome AF: 0.152

Gnomad4 FIN exome AF: 0.139

Gnomad4 NFE exome AF: 0.116

Gnomad4 OTH exome AF: 0.154

GnomAD4 genome AF: 0.135 AC: 20547 AN: 152004 Hom.: 1749 Cov.: 32 AF XY: 0.139 AC XY: 10354 AN XY: 74282

Gnomad4 AFR AF: 0.127

Gnomad4 AMR AF: 0.165

Gnomad4 ASJ AF: 0.136

Gnomad4 EAS AF: 0.464

Gnomad4 SAS AF: 0.142

Gnomad4 FIN AF: 0.130

Gnomad4 NFE AF: 0.110

Gnomad4 OTH AF: 0.124

Alfa AF: 0.114 Hom.: 1382

Bravo AF: 0.141

Asia WGS AF: 0.327 AC: 1136 AN: 3478

ClinVar

Significance: Benign

Submissions summary: Benign:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:2

Benign, criteria provided, single submitter	clinical testing	GeneDx	Nov 12, 2018	- -
Benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -

Polycystic kidney disease 2 Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 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 benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.89
CADD	Benign	3.5
DANN	Benign	0.52

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		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: rs2728121; hg19: chr4-88997102;