1-229432426-C-T

Variant names:

Variant summary

Our verdict is Pathogenic. The variant received 11 ACMG points: 11P and 0B. PM1PM2PM5PP2PP3_Strong

The NM_001100.4(ACTA1):c.460G>A(p.Val154Met) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000686 in 1,458,170 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 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. V154L) has been classified as Likely pathogenic.

Frequency

Genomes: not found (cov: 31)

Exomes 𝑓: 6.9e-7 ( 0 hom. )

Consequence

ACTA1
NM_001100.4 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 7.76

Publications

2 publications found

Variant links:

Genes affected

ACTA1 (HGNC:129): (actin alpha 1, skeletal muscle) The product encoded by this gene belongs to the actin family of proteins, which are highly conserved proteins that play a role in cell motility, structure and integrity. Alpha, beta and gamma actin isoforms have been identified, with alpha actins being a major constituent of the contractile apparatus, while beta and gamma actins are involved in the regulation of cell motility. This actin is an alpha actin that is found in skeletal muscle. Mutations in this gene cause a variety of myopathies, including nemaline myopathy, congenital myopathy with excess of thin myofilaments, congenital myopathy with cores, and congenital myopathy with fiber-type disproportion, diseases that lead to muscle fiber defects with manifestations such as hypotonia. [provided by RefSeq, Sep 2019]

ACTA1 Gene-Disease associations (from GenCC):

alpha-actinopathy
Inheritance: AR, AD Classification: DEFINITIVE Submitted by: ClinGen
congenital myopathy 2a, typical, autosomal dominant
Inheritance: AR, SD, AD Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae), Ambry Genetics
congenital myopathy with excess of thin filaments
Inheritance: SD Classification: DEFINITIVE Submitted by: Illumina
congenital myopathy 2c, severe infantile, autosomal dominant
Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
childhood-onset nemaline myopathy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
congenital fiber-type disproportion myopathy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
intermediate nemaline myopathy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
progressive scapulohumeroperoneal distal myopathy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
typical nemaline myopathy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
rigid spine syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
severe congenital nemaline myopathy
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
zebra body myopathy
Inheritance: Unknown Classification: SUPPORTIVE Submitted by: Orphanet

ACTA1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 11 ACMG points.

PM1

In a hotspot region, there are 9 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 6 uncertain in NM_001100.4

PM2

Very rare variant in population databases, with high coverage;

PM5

Other missense variant is known to change same aminoacid residue: Variant chr1-229432426-C-A is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 855039.Status of the report is criteria_provided_single_submitter, 1 stars.

PP2

Missense variant in the ACTA1 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 154 curated pathogenic missense variants (we use a threshold of 10). The gene has 0 curated benign missense variants. Gene score misZ: 4.5292 (above the threshold of 3.09). Trascript score misZ: 6.088 (above the threshold of 3.09). GenCC associations: The gene is linked to congenital myopathy with excess of thin filaments, congenital fiber-type disproportion myopathy, severe congenital nemaline myopathy, congenital myopathy 2a, typical, autosomal dominant, zebra body myopathy, alpha-actinopathy, rigid spine syndrome, progressive scapulohumeroperoneal distal myopathy, childhood-onset nemaline myopathy, typical nemaline myopathy, intermediate nemaline myopathy, congenital myopathy 2c, severe infantile, autosomal dominant.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.959

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ACTA1	NM_001100.4 link	c.460G>A	p.Val154Met	missense_variant	Exon 4 of 7	ENST00000366684.7	NP_001091.1	P68133

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
ACTA1	ENST00000366684.7 link	c.460G>A	p.Val154Met	missense_variant	Exon 4 of 7	1	NM_001100.4	ENSP00000355645.3	P68133
ACTA1	ENST00000366683.4 link	c.460G>A	p.Val154Met	missense_variant	Exon 4 of 7	5		ENSP00000355644.4	A6NL76
ACTA1	ENST00000684723.1 link	c.325G>A	p.Val109Met	missense_variant	Exon 3 of 6			ENSP00000508084.1	A0A804HKV3

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000406

AC:

AN:

246168

AF XY:

0.00000747

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000553

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

6.86e-7

AC:

AN:

1458170

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

725298

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33434

American (AMR)

AF:

0.00

AC:

AN:

44636

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26054

East Asian (EAS)

AF:

0.0000252

AC:

AN:

39618

South Asian (SAS)

AF:

0.00

AC:

AN:

86154

European-Finnish (FIN)

AF:

0.00

AC:

AN:

51642

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5630

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1110750

Other (OTH)

AF:

0.00

AC:

AN:

60252

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.575

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.99

BayesDel_addAF

Pathogenic

0.45

BayesDel_noAF

Pathogenic

0.58

CADD

Pathogenic

(source)

DANN

Uncertain

0.99

DEOGEN2

Pathogenic

0.98

D;D

Eigen

Pathogenic

0.90

Eigen_PC

Pathogenic

0.71

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Pathogenic

0.98

D;D

M_CAP

Pathogenic

0.91

MetaRNN

Pathogenic

0.96

D;D

MetaSVM

Pathogenic

0.96

MutationAssessor

Pathogenic

4.5

H;.

PhyloP100

7.8

PrimateAI

Pathogenic

0.89

PROVEAN

Uncertain

-2.4

N;.

REVEL

Pathogenic

0.94

Sift4G

Uncertain

0.021

D;D

Polyphen

1.0

D;.

Vest4

0.86

MutPred

0.79

Gain of disorder (P = 0.0832);Gain of disorder (P = 0.0832);

MVP

0.99

ClinPred

0.87

GERP RS

4.4

Varity_R

0.93

gMVP

0.98

Mutation Taster

=10/90

disease causing

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over