rs397516568

Variant names:

• chr1-236747671-C-G
• rs397516568
• NM_001103.4:c.1411C>G

Variant summary

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

The NM_001103.4(ACTN2):​c.1411C>G​(p.Leu471Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 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. L471P) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: ACTN2 NM_001103.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.78
• Publications: 0 publications found

Genes affected

ACTN2 (HGNC:164): (actinin alpha 2) Alpha actinins belong to the spectrin gene superfamily which represents a diverse group of cytoskeletal proteins, including the alpha and beta spectrins and dystrophins. Alpha actinin is an actin-binding protein with multiple roles in different cell types. In nonmuscle cells, the cytoskeletal isoform is found along microfilament bundles and adherens-type junctions, where it is involved in binding actin to the membrane. In contrast, skeletal, cardiac, and smooth muscle isoforms are localized to the Z-disc and analogous dense bodies, where they help anchor the myofibrillar actin filaments. This gene encodes a muscle-specific, alpha actinin isoform that is expressed in both skeletal and cardiac muscles. Several transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, May 2013]

ACTN2 Gene-Disease associations (from GenCC):

• intrinsic cardiomyopathy

  Inheritance: AD Classification: DEFINITIVE, MODERATE Submitted by: Laboratory for Molecular Medicine, ClinGen
• myopathy, congenital, with structured cores and z-line abnormalities

  Inheritance: AD Classification: STRONG, MODERATE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
• dilated cardiomyopathy 1AA

  Inheritance: AD Classification: MODERATE, LIMITED Submitted by: PanelApp Australia, Labcorp Genetics (formerly Invitae), Ambry Genetics
• familial isolated dilated cardiomyopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• heart conduction disease

  Inheritance: AD Classification: LIMITED Submitted by: Genomics England PanelApp
• myopathy, distal, 6, adult-onset, autosomal dominant

  Inheritance: AD, Unknown Classification: LIMITED Submitted by: Broad Center for Mendelian Genomics, Labcorp Genetics (formerly Invitae)

ACMG classification

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
ACTN2	NM_001103.4	c.1411C>G	p.Leu471Val	missense_variant	Exon 13 of 21	ENST00000366578.6	NP_001094.1
ACTN2	NM_001278343.2	c.1411C>G	p.Leu471Val	missense_variant	Exon 13 of 21		NP_001265272.1
ACTN2	NR_184402.1	n.1783C>G		non_coding_transcript_exon_variant	Exon 15 of 23

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ACTN2	ENST00000366578.6	c.1411C>G	p.Leu471Val	missense_variant	Exon 13 of 21	1	NM_001103.4	ENSP00000355537.4

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 specified Uncertain:1

May 09, 2012

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant classified as Uncertain Significance - Favor Pathogenic. The Leu471Val v ariant in ACTN2 has not been reported in the literature nor previously identifie d by our laboratory. This variant was absent from 2 very large and broad popula tions (European and African American) screened by the NHLBI Exome Sequencing Pro ject (http://evs.gs.washington.edu/EVS). This low frequency is consistent with a disease causing role but insufficient to establish this with confidence. Comput ational analyses (biochemical amino acid properties, conservation, AlignGVGD, Po lyPhen2, and SIFT) suggest that this variant may impact the protein, though this information is not predictive enough to determine pathogenicity. Although this data supports that the Leu471Val variant may be pathogenic, additional studies a re needed to fully assess its clinical significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.72
BayesDel_addAF	Uncertain	0.056	T
BayesDel_noAF	Benign	-0.16
CADD	Benign	21
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.51	.;.;D
Eigen	Uncertain	0.34
Eigen_PC	Uncertain	0.34
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Uncertain	0.93	D;D;D
M_CAP	Benign	0.040	D
MetaRNN	Uncertain	0.54	D;D;D
MetaSVM	Uncertain	-0.24	T
MutationAssessor	Uncertain	2.7	.;M;M
PhyloP100		2.8
PrimateAI	Pathogenic	0.81	D
PROVEAN	Uncertain	-2.7	.;D;D
REVEL	Uncertain	0.31
Sift	Uncertain	0.0040	.;D;D
Sift4G	Pathogenic	0.0	D;D;D
Polyphen		0.54	.;.;P
Vest4		0.69
MutPred		0.45		.;Loss of stability (P = 0.0691);Loss of stability (P = 0.0691);
MVP		0.57
MPC		0.41
ClinPred		0.97	D
GERP RS		3.9
Varity_R		0.84
gMVP		0.30
Mutation Taster		=81/19	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs397516568; hg19: chr1-236910971;