12-109802993-C-T

Variant names:

Variant summary

Our verdict is Likely pathogenic. The variant received 8 ACMG points: 8P and 0B. PM1PM2PM5PP5_Moderate

The NM_021625.5(TRPV4):c.710G>A(p.Arg237Gln) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,568 control chromosomes in the GnomAD database, with no homozygous occurrence. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Likely pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R237G) has been classified as Pathogenic.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

TRPV4
NM_021625.5 missense, splice_region

Scores

Splicing: ADA: 0.8170

Clinical Significance

Likely pathogenic criteria provided, single submitter P:2

Conservation

PhyloP100: 1.26

Publications

6 publications found

Variant links:

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 Gene-Disease associations (from GenCC):

metatropic dysplasia
Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, G2P
neuromuscular disease
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
spondylometaphyseal dysplasia, Kozlowski type
Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: G2P, Orphanet
TRPV4-related bone disorder
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen, Illumina
autosomal dominant brachyolmia
Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet, Genomics England PanelApp
Charcot-Marie-Tooth disease axonal type 2C
Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae)
scapuloperoneal spinal muscular atrophy, autosomal dominant
Inheritance: AD Classification: MODERATE, SUPPORTIVE Submitted by: Orphanet, Ambry Genetics
familial avascular necrosis of femoral head
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
familial digital arthropathy-brachydactyly
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
neuronopathy, distal hereditary motor, autosomal dominant 8
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
parastremmatic dwarfism
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

TRPV4 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_pathogenic. The variant received 8 ACMG points.

PM1

In a hotspot region, there are 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 13 uncertain in NM_021625.5

PM2

Very rare variant in population databases, with high coverage;

PM5

Other missense variant is known to change same aminoacid residue: Variant chr12-109802994-G-C is described in ClinVar as Pathogenic. ClinVar VariationId is 1073853.Status of the report is criteria_provided_single_submitter, 1 stars.

PP5

Variant 12-109802993-C-T is Pathogenic according to our data. Variant chr12-109802993-C-T is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 1679171.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TRPV4	NM_021625.5 link	c.710G>A	p.Arg237Gln	missense_variant, splice_region_variant	Exon 4 of 16	ENST00000261740.7	NP_067638.3	Q9HBA0-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TRPV4	ENST00000261740.7 link	c.710G>A	p.Arg237Gln	missense_variant, splice_region_variant	Exon 4 of 16	1	NM_021625.5	ENSP00000261740.2		Q9HBA0-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461568

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

727100

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33478

American (AMR)

AF:

0.00

AC:

AN:

44716

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26132

East Asian (EAS)

AF:

0.00

AC:

AN:

39686

South Asian (SAS)

AF:

0.00

AC:

AN:

86250

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53178

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5764

European-Non Finnish (NFE)

AF:

8.99e-7

AC:

AN:

1111972

Other (OTH)

AF:

0.00

AC:

AN:

60392

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

Cov.:

Alfa

AF:

0.00

Hom.:

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Charcot-Marie-Tooth disease axonal type 2C

Pathogenic:1

Apr 12, 2022

Institute of Human Genetics, University of Leipzig Medical Center

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

_x000D_ Criteria applied: PM5_STR, PM2_SUP, PP3 -

Tip-toe gait

Pathogenic:1

Jan 14, 2022

Practice for Gait Abnormalities, David Pomarino, Competency Network Toe Walking c/o Practice Pomarino

Significance:Likely pathogenic

Review Status:flagged submission

Collection Method:clinical testing

Hereditary motor sensory neuropathy (HMSN), also known as Charcot-Marie-Tooth Disease (CMT), is the most commonly inherited peripheral polyneuropathy. It constitutes a group of inherited, progressive, motor and sensory peripheral nerve disorders with properties of demyelination, axonal degeneration, or both. It is classified by clinical characteristics, modes of inheritance, electrophysiologic features, metabolic defects, and specific gene markers. Our patients all walk on tiptoe, so they show similar symptoms. When we genetically test them with our toe walking panel, we find that around 90 per cent of them have a genetic variant that explains their toe walking. These can be assigned, for example, to the area of myopathies (such as variants of the COL6A3 gene), the area of hereditary neuropathies (such as variants of the KMT2C gene) or the area of metabolic diseases (such as variants of the PYGM gene). In a smaller group of patients with almost identical symptoms, no abnormality is found in the genes of our panel, but spastic paraplegia can be detected. In another small group of our toe walkers, no abnormalities can be detected in the genes analysed in our toe walking panel, nor do they suffer from spastic paraplegia, as is also the case with healthy children. In contrast to these, however, they show a tiptoe gait. These patients suffer from infantile cerebral palsy, in which toe walking can also be observed. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.60

BayesDel_addAF

Uncertain

0.15

BayesDel_noAF

Uncertain

-0.030

CADD

Pathogenic

(source)

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.43

T;T;.;.;.;.

Eigen

Benign

0.10

Eigen_PC

Benign

0.14

FATHMM_MKL

Uncertain

0.83

LIST_S2

Benign

0.84

.;T;D;D;D;T

M_CAP

Benign

0.050

MetaRNN

Uncertain

0.51

D;D;T;D;T;D

MetaSVM

Benign

-0.57

MutationAssessor

Benign

0.39

N;N;N;N;N;.

PhyloP100

1.3

PrimateAI

Uncertain

0.66

PROVEAN

Benign

-1.6

N;N;N;N;N;N

REVEL

Uncertain

0.41

Sift

Benign

0.12

T;T;T;T;T;T

Sift4G

Benign

0.097

T;T;T;T;D;T

Polyphen

1.0

D;D;D;D;P;D

Vest4

0.55

MutPred

0.53

Gain of catalytic residue at I234 (P = 0);Gain of catalytic residue at I234 (P = 0);Gain of catalytic residue at I234 (P = 0);Gain of catalytic residue at I234 (P = 0);Gain of catalytic residue at I234 (P = 0);.;

MVP

0.86

MPC

0.94

ClinPred

0.91

GERP RS

4.5

Varity_R

0.52

gMVP

0.78

Mutation Taster

=31/69

disease causing

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.82

dbscSNV1_RF

Benign

0.72

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over