18-10736621-G-A

Position:

• chr18-10736621-G-A

Variant summary

Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PVS1 PP5_Very_Strong

The NM_001378183.1(PIEZO2):​c.4798C>T​(p.Arg1600Ter) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000505 in 1,384,882 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000051 (0 hom.)
• Consequence: PIEZO2 NM_001378183.1 stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 1.45

Genes affected

PIEZO2 (HGNC:26270): (piezo type mechanosensitive ion channel component 2) The protein encoded by this gene contains more than thirty transmembrane domains and likely functions as part of mechanically-activated (MA) cation channels. These channels serve to connect mechanical forces to biological signals. The encoded protein quickly adapts MA currents in somatosensory neurons. Defects in this gene are a cause of type 5 distal arthrogryposis. Several alternatively spliced transcript variants of this gene have been described, but their full-length nature is not known. [provided by RefSeq, Feb 2014]

ACMG classification

Verdict is Pathogenic. Variant got 16 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PP5: Variant 18-10736621-G-A is Pathogenic according to our data. Variant chr18-10736621-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 265868.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PIEZO2	NM_001378183.1	c.4798C>T	p.Arg1600Ter	stop_gained	34/56	ENST00000674853.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PIEZO2	ENST00000674853.1	c.4798C>T	p.Arg1600Ter	stop_gained	34/56		NM_001378183.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000505 AC: 7 AN: 1384882 Hom.: 0 Cov.: 31 AF XY: 0.00000585 AC XY: 4 AN XY: 683370

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000252

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000463

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Invitae	Sep 25, 2019	For these reasons, this variant has been classified as Pathogenic. Loss-of-function variants in PIEZO2 are known to be pathogenic (PMID: 27653382, 27843126). This variant has been observed in individual(s) with arthrogryposis with impaired proprioception and touch (PMID: 27653382). In at least one individual the data is consistent with the variant being in trans (on the opposite chromosome) from a pathogenic variant. ClinVar contains an entry for this variant (Variation ID: 265868). This variant is not present in population databases (ExAC no frequency). This sequence change creates a premature translational stop signal (p.Arg1575*) in the PIEZO2 gene. It is expected to result in an absent or disrupted protein product. -
Pathogenic, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Oct 07, 2019	- -

Arthrogryposis, distal, with impaired proprioception and touch Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Sep 11, 2018

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.62
CADD	Pathogenic	37
DANN	Uncertain	1.0
Eigen	Uncertain	0.50
Eigen_PC	Uncertain	0.30
FATHMM_MKL	Uncertain	0.78	D
MutationTaster	Benign	1.0	A;A;A
Vest4		0.80
GERP RS		2.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		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: rs886039822; hg19: chr18-10736619; COSMIC: COSV57440456; COSMIC: COSV57440456;