18-10752635-C-T

Variant names:

• chr18-10752635-C-T
• rs1555638052
• NM_001378183.1:c.4167+1G>A

Variant summary

Our verdict is Pathogenic. The variant received 10 ACMG points: 10P and 0B. PVS1 PM2

The NM_001378183.1(PIEZO2):​c.4167+1G>A variant causes a splice donor, intron change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000722 in 1,384,702 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 7.2e-7 (0 hom.)
• Consequence: PIEZO2 NM_001378183.1 splice_donor, intron
• Scores: Splicing: ADA: 1.000
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.54
• Publications: 0 publications found

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]

PIEZO2 Gene-Disease associations (from GenCC):

• Gordon syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae), Ambry Genetics, G2P
• arthrogryposis, distal, with impaired proprioception and touch

  Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), Illumina, G2P, Ambry Genetics
• arthrogryposis- oculomotor limitation-electroretinal anomalies syndrome

  Inheritance: AD Classification: MODERATE, SUPPORTIVE Submitted by: Orphanet, Ambry Genetics
• connective tissue disorder

  Inheritance: AR Classification: MODERATE Submitted by: Genomics England PanelApp
• Marden-Walker syndrome

  Inheritance: AR, AD Classification: MODERATE, SUPPORTIVE Submitted by: Orphanet, Genomics England PanelApp, Ambry Genetics

ACMG classification

Our verdict: Pathogenic. The variant received 10 ACMG points.

• PVS1: Splicing +-2 bp (donor or acceptor) variant, LoF is a know mechanism of disease, Cryptic splice site detected, with MaxEntScore 5, offset of 40, new splice context is: cgtGTaaga. Cryptic site results in frameshift change. If cryptic site found is not functional and variant results in exon loss, it results in frameshift change.
• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001378183.1. 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
	PIEZO2	NM_001378183.1	MANE Select	c.4167+1G>A		splice_donor intron	N/A	NP_001365112.1	A0A2H4UKA7
	PIEZO2	NM_001410871.1		c.4167+1G>A		splice_donor intron	N/A	NP_001397800.1	Q9H5I5-4
	PIEZO2	NM_022068.4		c.4092+1G>A		splice_donor intron	N/A	NP_071351.2	Q9H5I5-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PIEZO2	ENST00000674853.1	MANE Select	c.4167+1G>A		splice_donor intron	N/A	ENSP00000501957.1	A0A2H4UKA7
	PIEZO2	ENST00000503781.7	TSL:1	c.4092+1G>A		splice_donor intron	N/A	ENSP00000421377.3	Q9H5I5-1
	PIEZO2	ENST00000580640.5	TSL:5	c.4167+1G>A		splice_donor intron	N/A	ENSP00000463094.1	Q9H5I5-4

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 7.22e-7 AC: 1 AN: 1384702 Hom.: 0 Cov.: 30 AF XY: 0.00000146 AC XY: 1 AN XY: 683246

African (AFR) AF: 0.00 AC: 0 AN: 31588

American (AMR) AF: 0.00 AC: 0 AN: 35692

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25180

East Asian (EAS) AF: 0.00 AC: 0 AN: 35730

South Asian (SAS) AF: 0.00 AC: 0 AN: 79224

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 34936

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5694

European-Non Finnish (NFE) AF: 9.27e-7 AC: 1 AN: 1078760

Other (OTH) AF: 0.00 AC: 0 AN: 57898

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.39
CADD	Pathogenic	35
DANN	Uncertain	1.0
Eigen	Pathogenic	1.1
Eigen_PC	Pathogenic	0.98
FATHMM_MKL	Pathogenic	0.97	D
PhyloP100		7.5
GERP RS		5.0
Mutation Taster		=1/99	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.93
SpliceAI score (max)		0.99		Details are displayed if max score is > 0.2
DS_DG_spliceai		0.59		Position offset: -39
DS_DL_spliceai		0.99		Position offset: 1

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs1555638052; hg19: chr18-10752633;