Genetic Variant TPM1:p.Gln32Arg (chr15-63048670-A-G) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The ENST00000404484.9(TPM1):c.95A>G(p.Gln32Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000288 in 1,387,314 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. Q32L) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000029 ( 0 hom. )

Consequence

TPM1
ENST00000404484.9 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 8.40

Publications

1 publications found

Variant links:

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 links:

TPM1-AS (HGNC:53635): (TPM1 antisense RNA)

TPM1-AS links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TPM1	NM_001018005.2 link	c.240+4518A>G		intron_variant	Intron 2 of 9	ENST00000403994.9	NP_001018005.1	P09493-1D9YZV4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TPM1	ENST00000403994.9 link	c.240+4518A>G		intron_variant	Intron 2 of 9	1	NM_001018005.2	ENSP00000385107.4		P09493-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000722

AC:

AN:

138542

AF XY:

0.00

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000104

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000288

AC:

AN:

1387314

Hom.:

Cov.:

AF XY:

0.00000146

AC XY:

AN XY:

684564

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

29536

American (AMR)

AF:

0.0000567

AC:

AN:

35290

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

24664

East Asian (EAS)

AF:

0.0000290

AC:

AN:

34444

South Asian (SAS)

AF:

0.00

AC:

AN:

78560

European-Finnish (FIN)

AF:

0.00

AC:

AN:

46558

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5646

European-Non Finnish (NFE)

AF:

9.30e-7

AC:

AN:

1075088

Other (OTH)

AF:

0.00

AC:

AN:

57528

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.003763), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.375

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.:

Bravo

AF:

0.0000189

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Uncertain

0.030

BayesDel_noAF

Benign

-0.19

CADD

Benign

(source)

DANN

Uncertain

0.99

DEOGEN2

Uncertain

0.77

.;D;.;.;.;D

Eigen

Benign

0.17

Eigen_PC

Benign

0.22

FATHMM_MKL

Uncertain

0.95

LIST_S2

Uncertain

0.86

D;D;T;D;D;T

M_CAP

Pathogenic

0.62

MetaRNN

Uncertain

0.59

D;D;D;D;D;D

MetaSVM

Uncertain

0.038

PhyloP100

8.4

PROVEAN

Benign

-2.1

N;N;.;N;N;N

REVEL

Uncertain

0.54

Sift

Uncertain

0.021

D;D;.;D;D;D

Sift4G

Benign

0.12

T;T;.;T;T;T

Polyphen

0.016, 0.0060

.;.;.;B;B;.

Vest4

0.43

MutPred

0.46

Gain of MoRF binding (P = 0.0342);Gain of MoRF binding (P = 0.0342);Gain of MoRF binding (P = 0.0342);Gain of MoRF binding (P = 0.0342);Gain of MoRF binding (P = 0.0342);Gain of MoRF binding (P = 0.0342);

MVP

0.88

ClinPred

0.76

GERP RS

3.8

PromoterAI

0.043

Neutral

(source)

Mutation Taster

=67/33

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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

Computational scores

Splicing

Publications

Other links and lift over