4-88007930-AC-ACC

Variant names:

• chr4-88007930-A-AC
• rs1187336837
• NM_000297.4:c.203dupC

Variant summary

Our verdict is Pathogenic. The variant received 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_000297.4(PKD2):​c.203dupC​(p.Ala69GlyfsTer23) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000207 in 1,446,166 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★★). Synonymous variant affecting the same amino acid position (i.e. P68P) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: 𝑓 0.000013 (0 hom., cov: 32)
  • Exomes 𝑓: 7.7e-7 (0 hom.)
• Consequence: PKD2 NM_000297.4 frameshift
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:13
• Conservation: PhyloP100: -0.393
• Publications: 2 publications found

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]

PKD2 Gene-Disease associations (from GenCC):

• autosomal dominant polycystic kidney disease

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet
• polycystic kidney disease 2

  Inheritance: AD, AR Classification: STRONG, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Genomics England PanelApp, Ambry Genetics

ENSG00000286618 (HGNC:):

ACMG classification

Our verdict: Pathogenic. The variant received 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 4-88007930-A-AC is Pathogenic according to our data. Variant chr4-88007930-A-AC is described in ClinVar as Pathogenic. ClinVar VariationId is 477627.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000297.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PKD2	NM_000297.4	MANE Select	c.203dupC	p.Ala69GlyfsTer23	frameshift	Exon 1 of 15	NP_000288.1	Q13563-1
	PKD2	NM_001440544.1		c.203dupC	p.Ala69GlyfsTer23	frameshift	Exon 1 of 14	NP_001427473.1
	PKD2	NR_156488.2		n.302dupC		non_coding_transcript_exon	Exon 1 of 14

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PKD2	ENST00000237596.7	TSL:1 MANE Select	c.203dupC	p.Ala69GlyfsTer23	frameshift	Exon 1 of 15	ENSP00000237596.2	Q13563-1
	PKD2	ENST00000927447.1		c.203dupC	p.Ala69GlyfsTer23	frameshift	Exon 1 of 15	ENSP00000597506.1
	PKD2	ENST00000927448.1		c.203dupC	p.Ala69GlyfsTer23	frameshift	Exon 1 of 14	ENSP00000597507.1

Frequencies

GnomAD3 genomes AF: 0.0000133 AC: 2 AN: 150278 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000132

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: 0.00

GnomAD4 exome AF: 7.72e-7 AC: 1 AN: 1295888 Hom.: 0 Cov.: 33 AF XY: 0.00000157 AC XY: 1 AN XY: 636938

African (AFR) AF: 0.00 AC: 0 AN: 26628

American (AMR) AF: 0.0000347 AC: 1 AN: 28828

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 22650

East Asian (EAS) AF: 0.00 AC: 0 AN: 28392

South Asian (SAS) AF: 0.00 AC: 0 AN: 70922

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 31894

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4356

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1029076

Other (OTH) AF: 0.00 AC: 0 AN: 53142

GnomAD4 genome AF: 0.0000133 AC: 2 AN: 150278 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 73376

African (AFR) AF: 0.00 AC: 0 AN: 40892

American (AMR) AF: 0.000132 AC: 2 AN: 15158

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3448

East Asian (EAS) AF: 0.00 AC: 0 AN: 5032

South Asian (SAS) AF: 0.00 AC: 0 AN: 4794

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10204

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 312

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 67462

Other (OTH) AF: 0.00 AC: 0 AN: 2068

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000756

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
5	-	-	Polycystic kidney disease 2 (5)
4	-	-	not provided (4)
2	-	-	Autosomal dominant polycystic kidney disease (2)
1	-	-	Inborn genetic diseases (1)
1	-	-	PKD2-related disorder (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		-0.39
Mutation Taster		=0/200	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs1187336837; hg19: chr4-88929082;