rs76030344

Variant names:

Your query was ambiguous. Multiple possible variants found:

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 2P and 3B. PM2BP4_ModerateBP7

The NM_001100.4(ACTA1):c.453C>T(p.Thr151Thr) variant causes a splice region, synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000206 in 1,457,812 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. T151T) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 31)

Exomes 𝑓: 0.0000021 ( 0 hom. )

Consequence

ACTA1
NM_001100.4 splice_region, synonymous

Scores

Splicing: ADA: 0.0002790

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -0.0410

Publications

3 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: Likely_benign. The variant received -1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.45).

BP7

Synonymous conserved (PhyloP=-0.041 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ACTA1	NM_001100.4 link	c.453C>T	p.Thr151Thr	splice_region_variant, synonymous_variant	Exon 3 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.453C>T	p.Thr151Thr	splice_region_variant, synonymous_variant	Exon 3 of 7	1	NM_001100.4	ENSP00000355645.3	P68133
ACTA1	ENST00000366683.4 link	c.453C>T	p.Thr151Thr	splice_region_variant, synonymous_variant	Exon 3 of 7	5		ENSP00000355644.4	A6NL76
ACTA1	ENST00000684723.1 link	c.318C>T	p.Thr106Thr	splice_region_variant, synonymous_variant	Exon 2 of 6			ENSP00000508084.1	A0A804HKV3

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000406

AC:

AN:

246562

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:

0.0000546

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000206

AC:

AN:

1457812

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

725090

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33408

American (AMR)

AF:

0.00

AC:

AN:

44672

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25880

East Asian (EAS)

AF:

0.0000252

AC:

AN:

39684

South Asian (SAS)

AF:

0.00

AC:

AN:

85830

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53032

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4428

European-Non Finnish (NFE)

AF:

0.00000180

AC:

AN:

1110722

Other (OTH)

AF:

0.00

AC:

AN:

60156

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.492

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:

0.0000227

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Actin accumulation myopathy

Uncertain:1

Sep 30, 2021

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change affects codon 151 of the ACTA1 mRNA. It is a 'silent' change, meaning that it does not change the encoded amino acid sequence of the ACTA1 protein. This variant is not present in population databases (ExAC no frequency). This variant has not been reported in the literature in individuals with ACTA1-related disease. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant is not likely to affect RNA splicing, but this prediction has not been confirmed by published transcriptional studies. 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.45

CADD

Benign

(source)

DANN

Benign

0.86

PhyloP100

-0.041

Mutation Taster

=53/47

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.00028

dbscSNV1_RF

Benign

0.062

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