rs747400815

Positions:

• chr1-236739531-C-G
• chr1-236739531-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_001103.4(ACTN2):​c.1106C>G​(p.Ser369Trp) variant causes a missense, splice region 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. 2/3 splice prediction tools predicting alterations to normal splicing. 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. S369L) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 31)
• Consequence: ACTN2 NM_001103.4 missense, splice_region
• Scores: Splicing: ADA: 0.9771
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.87

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF. No scorers claiming Uncertain. Scorers claiming Benign: max_spliceai.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ACTN2	NM_001103.4	c.1106C>G	p.Ser369Trp	missense_variant, splice_region_variant	10/21	ENST00000366578.6
ACTN2	NM_001278343.2	c.1106C>G	p.Ser369Trp	missense_variant, splice_region_variant	10/21
ACTN2	NR_184402.1	n.1478C>G		splice_region_variant, non_coding_transcript_exon_variant	12/23

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ACTN2	ENST00000366578.6	c.1106C>G	p.Ser369Trp	missense_variant, splice_region_variant	10/21	1	NM_001103.4	A1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 67

GnomAD4 genome Cov.: 31

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.68
BayesDel_addAF	Pathogenic	0.30	D
BayesDel_noAF	Pathogenic	0.20
CADD	Pathogenic	33
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.58	.;.;D
Eigen	Pathogenic	0.69
Eigen_PC	Pathogenic	0.71
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Pathogenic	0.99	D;D;D
M_CAP	Benign	0.066	D
MetaRNN	Pathogenic	0.80	D;D;D
MetaSVM	Uncertain	-0.22	T
MutationAssessor	Uncertain	2.8	.;M;M
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Pathogenic	0.85	D
PROVEAN	Pathogenic	-5.2	.;D;D
REVEL	Uncertain	0.56
Sift	Pathogenic	0.0	.;D;D
Sift4G	Pathogenic	0.0010	D;D;D
Polyphen		1.0	.;.;D
Vest4		0.80
MutPred		0.58		.;Loss of disorder (P = 0.0135);Loss of disorder (P = 0.0135);
MVP		0.79
MPC		0.95
ClinPred		1.0	D
GERP RS		5.5
Varity_R		0.79
gMVP		0.60

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	0.98
dbscSNV1_RF	Pathogenic	0.83
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

LitVar

Other links and lift over

dbSNP: rs747400815; hg19: chr1-236902831;