chr16-2091458-G-A

Position:

• chr16-2091458-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM1 PM2

The NM_001009944.3(PKD1):​c.11677C>T​(p.Leu3893Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000036 in 1,110,218 control chromosomes in the GnomAD database, with no homozygous occurrence. 13/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (no stars).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000036 (0 hom.)
• Consequence: PKD1 NM_001009944.3 missense
• Clinical Significance: Uncertain significance no assertion criteria provided U:1
• Conservation: PhyloP100: 2.86

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]

PKD1-AS1 (HGNC:56035): (PKD1 antisense RNA 1)

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM1: In a topological_domain Extracellular (size 214) in uniprot entity PKD1_HUMAN there are 39 pathogenic changes around while only 11 benign (78%) in NM_001009944.3
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PKD1	NM_001009944.3	c.11677C>T	p.Leu3893Phe	missense_variant	42/46	ENST00000262304.9	NP_001009944.3
PKD1-AS1	NR_135175.1	n.23G>A		non_coding_transcript_exon_variant	1/3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PKD1	ENST00000262304.9	c.11677C>T	p.Leu3893Phe	missense_variant	42/46	1	NM_001009944.3	ENSP00000262304	P5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000360 AC: 4 AN: 1110218 Hom.: 0 Cov.: 32 AF XY: 0.00000558 AC XY: 3 AN XY: 537336

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.000286

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.0000396

Gnomad4 NFE exome AF: 0.00000107

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: no assertion criteria provided

Submissions by phenotype

PKD1-related disorder Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Jan 10, 2024

The PKD1 c.11677C>T variant is predicted to result in the amino acid substitution p.Leu3893Phe. To our knowledge, this variant has not been reported in the literature or in a large population database (http://gnomad.broadinstitute.org), indicating this variant is rare. At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Benign	-0.12	T
BayesDel_noAF	Benign	-0.41
CADD	Benign	19
DANN	Benign	0.89
DEOGEN2	Benign	0.14	T;.
Eigen	Benign	-0.55
Eigen_PC	Benign	-0.58
FATHMM_MKL	Uncertain	0.81	D
LIST_S2	Benign	0.61	T;T
M_CAP	Pathogenic	0.87	D
MetaRNN	Uncertain	0.45	T;T
MetaSVM	Benign	-0.89	T
MutationAssessor	Benign	1.8	L;.
MutationTaster	Benign	0.87	D;D
PrimateAI	Pathogenic	0.81	D
PROVEAN	Benign	0.19	N;N
REVEL	Benign	0.10
Sift	Benign	0.14	T;T
Sift4G	Uncertain	0.025	D;D
Polyphen		0.12	B;B
Vest4		0.17
MutPred		0.59		Loss of sheet (P = 0.0817);.;
MVP		0.64
ClinPred		0.56	D
GERP RS		0.80
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		2.2
Varity_R		0.13
gMVP		0.40

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: rs973293202; hg19: chr16-2141459;