rs727502880

Variant names:

• chr17-81510767-T-C
• rs727502880
• NM_001614.5:c.1051A>G

Your query was ambiguous. Multiple possible variants found:

• chr17-81510767-T-C
• chr17-81510767-T-G

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_001614.5(ACTG1):​c.1051A>G​(p.Thr351Ala) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T351P) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: ACTG1 NM_001614.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.62
• Publications: 0 publications found

Genes affected

ACTG1 (HGNC:144): (actin gamma 1) Actins are highly conserved proteins that are involved in various types of cell motility and in maintenance of the cytoskeleton. Three main groups of actin isoforms have been identified in vertebrate animals: alpha, beta, and gamma. The alpha actins are found in muscle tissues and are a major constituent of the contractile apparatus. The beta and gamma actins co-exist in most cell types as components of the cytoskeleton and as mediators of internal cell motility. Actin gamma 1, encoded by this gene, is a cytoplasmic actin found in all cell types. Mutations in this gene are associated with DFNA20/26, a subtype of autosomal dominant non-syndromic sensorineural progressive hearing loss and also with Baraitser-Winter syndrome. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jul 2017]

ACTG1 Gene-Disease associations (from GenCC):

• Baraitser-winter syndrome 2

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: ClinGen, Labcorp Genetics (formerly Invitae), G2P, PanelApp Australia
• nonsyndromic genetic hearing loss

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• autosomal dominant nonsyndromic hearing loss 20

  Inheritance: AD Classification: STRONG Submitted by: PanelApp Australia, Labcorp Genetics (formerly Invitae)
• autosomal dominant nonsyndromic hearing loss

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Baraitser-Winter cerebrofrontofacial syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.946

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001614.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ACTG1	NM_001614.5	MANE Select	c.1051A>G	p.Thr351Ala	missense	Exon 6 of 6	NP_001605.1
	ACTG1	NM_001199954.3		c.1051A>G	p.Thr351Ala	missense	Exon 6 of 6	NP_001186883.1
	ACTG1	NR_037688.3		n.1123A>G		non_coding_transcript_exon	Exon 6 of 7

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ACTG1	ENST00000573283.7	TSL:5 MANE Select	c.1051A>G	p.Thr351Ala	missense	Exon 6 of 6	ENSP00000458435.1
	ACTG1	ENST00000575842.5	TSL:1	c.1051A>G	p.Thr351Ala	missense	Exon 5 of 5	ENSP00000458162.1
	ACTG1	ENST00000615544.5	TSL:1	c.1051A>G	p.Thr351Ala	missense	Exon 6 of 6	ENSP00000477968.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Jun 30, 2020

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Not observed in large population cohorts (Lek et al., 2016); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Missense variants in this gene are often considered pathogenic (Stenson et al., 2014); Has not been previously published as pathogenic or benign to our knowledge

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.93
BayesDel_addAF	Pathogenic	0.33	D
BayesDel_noAF	Pathogenic	0.24
CADD	Pathogenic	28
DANN	Uncertain	0.98
DEOGEN2	Pathogenic	0.89	D
Eigen	Uncertain	0.47
Eigen_PC	Uncertain	0.40
FATHMM_MKL	Uncertain	0.84	D
LIST_S2	Uncertain	0.91	D
M_CAP	Pathogenic	0.92	D
MetaRNN	Pathogenic	0.95	D
MetaSVM	Pathogenic	0.93	D
MutationAssessor	Uncertain	2.6	M
PhyloP100		7.6
PrimateAI	Pathogenic	0.88	D
PROVEAN	Uncertain	-2.6	D
REVEL	Pathogenic	0.87
Sift4G	Uncertain	0.041	D
Polyphen		0.54	P
Vest4		0.83
MutPred		0.74		Gain of helix (P = 0.132)
MVP		0.95
ClinPred		0.97	D
GERP RS		2.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.95
gMVP		0.89
Mutation Taster		=3/97	disease causing

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

Other links and lift over

dbSNP: rs727502880; hg19: chr17-79477793; COSMIC: COSV59511738; COSMIC: COSV59511738;