rs146304351

Positions:

• chr12-109808332-T-C

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 1P and 7B. PP2 BP4_Moderate BP6 BS2

The NM_021625.5(TRPV4):​c.523A>G​(p.Thr175Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000204 in 1,614,028 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.000026 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000020 (0 hom.)
• Consequence: TRPV4 NM_021625.5 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:11 B:2
• Conservation: PhyloP100: 1.06

Genes affected

TRPV4 (HGNC:18083): (transient receptor potential cation channel subfamily V member 4) This gene encodes a member of the OSM9-like transient receptor potential channel (OTRPC) subfamily in the transient receptor potential (TRP) superfamily of ion channels. The encoded protein is a Ca2+-permeable, nonselective cation channel that is thought to be involved in the regulation of systemic osmotic pressure. Mutations in this gene are the cause of spondylometaphyseal and metatropic dysplasia and hereditary motor and sensory neuropathy type IIC. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Apr 2010]

TRPV4 (HGNC:):

ACMG classification

Verdict is Likely_benign. Variant got -6 ACMG points.

• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), TRPV4. . Gene score misZ 1.9225 (greater than the threshold 3.09). Trascript score misZ 3.5609 (greater than threshold 3.09). GenCC has associacion of gene with TRPV4-related bone disorder, metatropic dysplasia, Charcot-Marie-Tooth disease axonal type 2C, spondylometaphyseal dysplasia, Kozlowski type, familial avascular necrosis of femoral head, parastremmatic dwarfism, neuromuscular disease, autosomal dominant brachyolmia, familial digital arthropathy-brachydactyly, neuronopathy, distal hereditary motor, autosomal dominant 8, scapuloperoneal spinal muscular atrophy, autosomal dominant.
• BP4: Computational evidence support a benign effect (MetaRNN=0.0868752).
• BP6: Variant 12-109808332-T-C is Benign according to our data. Variant chr12-109808332-T-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 448711.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=2, Uncertain_significance=11}.
• BS2: High AC in GnomAdExome4 at 29 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TRPV4	NM_021625.5	c.523A>G	p.Thr175Ala	missense_variant	3/16	ENST00000261740.7	NP_067638.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TRPV4	ENST00000261740.7	c.523A>G	p.Thr175Ala	missense_variant	3/16	1	NM_021625.5	ENSP00000261740.2

Frequencies

GnomAD3 genomes AF: 0.0000263 AC: 4 AN: 152144 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000241

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

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: 0.0000441

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.0000279 AC: 7 AN: 251258 Hom.: 0 AF XY: 0.0000368 AC XY: 5 AN XY: 135852

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000289

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000528

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000198 AC: 29 AN: 1461884 Hom.: 0 Cov.: 32 AF XY: 0.0000275 AC XY: 20 AN XY: 727240

Gnomad4 AFR exome AF: 0.0000597

Gnomad4 AMR exome AF: 0.0000224

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000234

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.0000263 AC: 4 AN: 152144 Hom.: 0 Cov.: 32 AF XY: 0.0000135 AC XY: 1 AN XY: 74330

Gnomad4 AFR AF: 0.0000241

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000441

Gnomad4 OTH AF: 0.00

Alfa AF: 0.0000344 Hom.: 0

Bravo AF: 0.0000340

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000116 AC: 1

ExAC AF: 0.0000330 AC: 4

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:11 Benign:2

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Uncertain:3 Benign:1

Uncertain significance, criteria provided, single submitter	clinical testing	Athena Diagnostics	May 22, 2024	Available data are insufficient to determine the clinical significance of the variant at this time. The frequency of this variant in the general population is higher than would generally be expected for pathogenic variants in this gene. (http://gnomad.broadinstitute.org) This variant has been identified in at least one individual with clinical features associated with this gene. Assessment of experimental evidence regarding the effect of this variant on protein function is inconclusive. Experimental studies show that this variant may disrupt phosphorylation of TRPV4, however it is unclear if this effect would be enough to have a clinical impact (PMID: 19661060). -
Uncertain significance, criteria provided, single submitter	clinical testing	Mayo Clinic Laboratories, Mayo Clinic	Jul 07, 2023	BP4 -
Uncertain significance, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Jun 01, 2019	- -
Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Dec 04, 2019	See Variant Classification Assertion Criteria. -

Charcot-Marie-Tooth disease axonal type 2C Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Oct 26, 2023	This sequence change replaces threonine, which is neutral and polar, with alanine, which is neutral and non-polar, at codon 175 of the TRPV4 protein (p.Thr175Ala). This variant is present in population databases (rs146304351, gnomAD 0.005%). This missense change has been observed in individual(s) with clinical features of Charcot-Marie-Tooth disease (PMID: 32376792). ClinVar contains an entry for this variant (Variation ID: 448711). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt TRPV4 protein function with a negative predictive value of 95%. Experimental studies have shown that this missense change affects TRPV4 function (PMID: 19661060). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -
Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Apr 27, 2017	This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases did not allow this variant to be ruled in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -

Charcot-Marie-Tooth disease Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Molecular Genetics Laboratory, London Health Sciences Centre

-

- -

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Feb 26, 2020

The p.T175A variant (also known as c.523A>G), located in coding exon 2 of the TRPV4 gene, results from an A to G substitution at nucleotide position 523. The threonine at codon 175 is replaced by alanine, an amino acid with similar properties. Functional studies demonstrated that the p.T175A alteration reduced sensitization of cells to protein kinase C (PKC) activation but did not affect sensitization to cyclic AMP-dependent protein kinase (PKA) activation in an in vitro study (Fan HC et al. J. Biol. Chem., 2009 Oct;284:27884-91). This amino acid position is not well conserved in available vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Neuronopathy, distal hereditary motor, autosomal dominant 8 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Apr 27, 2017

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases did not allow this variant to be ruled in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -

Scapuloperoneal spinal muscular atrophy Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Apr 27, 2017

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases did not allow this variant to be ruled in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -

Brachyrachia (short spine dysplasia) Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Apr 27, 2017

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases did not allow this variant to be ruled in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -

Metatropic dysplasia Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Apr 27, 2017

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases did not allow this variant to be ruled in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -

Spondylometaphyseal dysplasia, Kozlowski type Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Apr 27, 2017

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases allowed determination this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.065
BayesDel_addAF	Benign	-0.23	T
BayesDel_noAF	Benign	-0.42
CADD	Benign	18
DANN	Benign	0.63
DEOGEN2	Benign	0.23	T;T;.;.;.;.
Eigen	Benign	-0.71
Eigen_PC	Benign	-0.57
FATHMM_MKL	Benign	0.29	N
LIST_S2	Benign	0.27	.;T;T;T;T;T
M_CAP	Benign	0.058	D
MetaRNN	Benign	0.087	T;T;T;T;T;T
MetaSVM	Benign	-0.71	T
MutationAssessor	Benign	1.0	L;L;L;L;L;.
PrimateAI	Uncertain	0.72	T
PROVEAN	Benign	-0.38	N;N;N;N;N;N
REVEL	Benign	0.20
Sift	Benign	0.48	T;T;T;T;T;T
Sift4G	Benign	0.41	T;T;T;T;T;T
Polyphen		0.0010	B;B;B;B;B;B
Vest4		0.15
MVP		0.77
MPC		0.38
ClinPred		0.019	T
GERP RS		3.7
Varity_R		0.14
gMVP		0.18

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: rs146304351; hg19: chr12-110246137;