rs104894503

Variant names:

• chr15-63060899-G-A
• rs104894503
• NM_001018005.2:c.523G>A

Your query was ambiguous. Multiple possible variants found:

• chr15-63060899-G-A
• chr15-63060899-G-T

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 16P and 4B. PS3 PM1 PP3_Moderate PP5_Very_Strong BS2

The NM_001018005.2(TPM1):​c.523G>A​(p.Asp175Asn) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000867 in 1,614,042 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 (★★). ClinVar reports functional evidence for this variant: "SCV000209312: Several published functional studies have shown the deleterious effects of p.(D175N) (Muthuchamy et al., 1999" and additional evidence is available in ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D175Y) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.000026 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0000068 (0 hom.)
• Consequence: TPM1 NM_001018005.2 missense
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:21 O:1
• Conservation: PhyloP100: 10.0
• Publications: 78 publications found

Genes affected

TPM1 (HGNC:12010): (tropomyosin 1) This gene is a member of the tropomyosin family of highly conserved, widely distributed actin-binding proteins involved in the contractile system of striated and smooth muscles and the cytoskeleton of non-muscle cells. Tropomyosin is composed of two alpha-helical chains arranged as a coiled-coil. It is polymerized end to end along the two grooves of actin filaments and provides stability to the filaments. The encoded protein is one type of alpha helical chain that forms the predominant tropomyosin of striated muscle, where it also functions in association with the troponin complex to regulate the calcium-dependent interaction of actin and myosin during muscle contraction. In smooth muscle and non-muscle cells, alternatively spliced transcript variants encoding a range of isoforms have been described. Mutations in this gene are associated with type 3 familial hypertrophic cardiomyopathy and dilated cardiomyopathy 1Y. [provided by RefSeq, Jun 2022]

TPM1 Gene-Disease associations (from GenCC):

• hypertrophic cardiomyopathy

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• hypertrophic cardiomyopathy 3

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)
• dilated cardiomyopathy 1Y

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• dilated cardiomyopathy

  Inheritance: AD Classification: MODERATE Submitted by: ClinGen
• familial isolated dilated cardiomyopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• left ventricular noncompaction

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• arrhythmogenic right ventricular cardiomyopathy

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

ACMG classification

Our verdict: Pathogenic. The variant received 12 ACMG points.

• PS3: PS3 evidence extracted from ClinVar submissions: SCV000209312: Several published functional studies have shown the deleterious effects of p.(D175N) (Muthuchamy et al., 1999; Mathur et al., 2011; Ly et al., 2012; Sewanan et al., 2016), including an in vitro study performed by Bottinelli et al., 1998, that showed that p.(D175N) results in increased calcium sensitivity.; SCV000059992: "functional studies support a pathogenic role for this variant (Bottinelli 1998, Muthu chamy 1999, Mathur 2011, Bai 2011, Borovikov 2011, Wang 2011, Li 2012, Ly 2012, Rysev 2012)."; SCV000547697: Experimental studies have shown that this missense change affects TPM1 function (PMID: 9245729, 10400910, 10900175, 22155441).; SCV004812546: An in vitro functional assay in heart muscle fibres and a transgenic mouse model expressing this variant in the heart showed an increase in calcium ion (Ca2+) sensitivity (PMID: 9440709, 10400910).; SCV000740009: Functional studies have shown the presence of this alteration affected local stability of the tropomyosin 1 protein and increased calcium sensitivity and residual ATPase activity, with impact on calcium-dependent signaling cascades (Bottinelli, 1998; Ly, 2012; Robinson, 2018).; SCV000053302: In a mouse model, the variant resulted in impairment of both contractility and relaxation in hearts, along with a hypertrophic myocytes as determined by histology which are all consistent with the human phenotype (example, Muthuchamy_1999). PMID: 14734051, 10400910; SCV001346437: Functional studies have shown that this variant increases calcium sensitivity, sliding velocity and the bending flexibility of the thin filaments (PMID: 9245729, 10900175, 22789852, 22794249, 29361520, 30923661). Transgenic mouse expressing this variant only in heart exhibited myocardial functional impairment and histologic structural changes as in the human form of the disease (PMID: 10400910).; SCV006059917: Functional studies conducted in patient tissue, non-human cells, and a mouse model demonstrated that the p.(Asp175Asn) variant impacts protein structure and function (PMID: 8205619; 10400910; 22462493; 29760186).
• PM1: In a hotspot region, there are 8 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 13 uncertain in NM_001018005.2
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.903
• PP5: Variant 15-63060899-G-A is Pathogenic according to our data. Variant chr15-63060899-G-A is described in ClinVar as Pathogenic. ClinVar VariationId is 12456.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS2: High AC in GnomAdExome4 at 10 AD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001018005.2. 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
	TPM1	NM_001018005.2	MANE Select	c.523G>A	p.Asp175Asn	missense	Exon 5 of 10	NP_001018005.1	D9YZV4
	TPM1	NM_001365778.1		c.649G>A	p.Asp217Asn	missense	Exon 6 of 10	NP_001352707.1	Q6ZN40
	TPM1	NM_001407322.1		c.649G>A	p.Asp217Asn	missense	Exon 6 of 11	NP_001394251.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TPM1	ENST00000403994.9	TSL:1 MANE Select	c.523G>A	p.Asp175Asn	missense	Exon 5 of 10	ENSP00000385107.4	P09493-1
	TPM1	ENST00000267996.11	TSL:1	c.523G>A	p.Asp175Asn	missense	Exon 5 of 9	ENSP00000267996.7	P09493-7
	TPM1	ENST00000288398.10	TSL:1	c.523G>A	p.Asp175Asn	missense	Exon 5 of 10	ENSP00000288398.6	P09493-10

Frequencies

GnomAD3 genomes AF: 0.0000263 AC: 4 AN: 152198 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.000288

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.000188

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000159 AC: 4 AN: 251400 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.000139

Gnomad NFE exome AF: 0.00000879

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000684 AC: 10 AN: 1461844 Hom.: 0 Cov.: 31 AF XY: 0.00000550 AC XY: 4 AN XY: 727220

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39698

South Asian (SAS) AF: 0.0000116 AC: 1 AN: 86236

European-Finnish (FIN) AF: 0.000112 AC: 6 AN: 53398

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00000270 AC: 3 AN: 1112008

Other (OTH) AF: 0.00 AC: 0 AN: 60396

GnomAD4 genome AF: 0.0000263 AC: 4 AN: 152198 Hom.: 0 Cov.: 32 AF XY: 0.0000403 AC XY: 3 AN XY: 74358

African (AFR) AF: 0.00 AC: 0 AN: 41434

American (AMR) AF: 0.00 AC: 0 AN: 15280

Ashkenazi Jewish (ASJ) AF: 0.000288 AC: 1 AN: 3472

East Asian (EAS) AF: 0.00 AC: 0 AN: 5202

South Asian (SAS) AF: 0.00 AC: 0 AN: 4826

European-Finnish (FIN) AF: 0.000188 AC: 2 AN: 10620

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.0000147 AC: 1 AN: 68044

Other (OTH) AF: 0.00 AC: 0 AN: 2092

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.0000113

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
7	-	-	not provided (7)
4	-	-	Hypertrophic cardiomyopathy (4)
3	-	-	Cardiomyopathy (3)
3	-	-	Hypertrophic cardiomyopathy 3 (4)
1	-	-	Cardiovascular phenotype (1)
1	-	-	Dilated cardiomyopathy 1Y (1)
1	-	-	Primary dilated cardiomyopathy (1)
1	-	-	Primary familial hypertrophic cardiomyopathy (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.51
CardioboostCm	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.27	D
BayesDel_noAF	Pathogenic	0.15
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.97	D
Eigen	Pathogenic	0.74
Eigen_PC	Pathogenic	0.78
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Benign	0.79	T
M_CAP	Pathogenic	0.73	D
MetaRNN	Pathogenic	0.90	D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	3.3	M
PhyloP100		10
PrimateAI	Pathogenic	0.83	D
PROVEAN	Uncertain	-3.6	D
REVEL	Pathogenic	0.79
Sift	Uncertain	0.0010	D
Sift4G	Uncertain	0.046	D
Polyphen		0.24	B
Vest4		0.87
MutPred		0.81		Gain of MoRF binding (P = 0.0534)
MVP		0.96
MPC		2.3
ClinPred		0.91	D
GERP RS		5.8
Varity_R		0.56
gMVP		0.95
Mutation Taster		=0/100	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
Splicevardb		2.0
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

Other links and lift over

dbSNP: rs104894503; hg19: chr15-63353098;