rs387907345

Positions:

• chr14-68921033-C-T

Variant summary

Our verdict is Pathogenic. Variant got 13 ACMG points: 13P and 0B. PM2 PP2 PP3_Moderate PP5_Very_Strong

The NM_001130004.2(ACTN1):​c.313G>A​(p.Val105Ile) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,804 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: ACTN1 NM_001130004.2 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:5
• Conservation: PhyloP100: 7.86

Genes affected

ACTN1 (HGNC:163): (actinin alpha 1) 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 nonmuscle, cytoskeletal, alpha actinin isoform and maps to the same site as the structurally similar erythroid beta spectrin gene. Three transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

ACTN1 (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 13 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), ACTN1. . Gene score misZ 3.3621 (greater than the threshold 3.09). Trascript score misZ 5.1933 (greater than threshold 3.09). GenCC has associacion of gene with autosomal dominant macrothrombocytopenia, platelet-type bleeding disorder 15.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.884
• PP5: Variant 14-68921033-C-T is Pathogenic according to our data. Variant chr14-68921033-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 42028.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ACTN1	NM_001130004.2	c.313G>A	p.Val105Ile	missense_variant	3/22	ENST00000394419.9	NP_001123476.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ACTN1	ENST00000394419.9	c.313G>A	p.Val105Ile	missense_variant	3/22	1	NM_001130004.2	ENSP00000377941.4

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461804 Hom.: 0 Cov.: 30 AF XY: 0.00000275 AC XY: 2 AN XY: 727198

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000180

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Platelet-type bleeding disorder 15 Pathogenic:3

Pathogenic, criteria provided, single submitter	clinical testing	ISTH-SSC Genomics in Thrombosis and Hemostasis, KU Leuven, Center for Molecular and Vascular Biology	-	- -
Pathogenic, no assertion criteria provided	literature only	OMIM	Mar 07, 2013	- -
Pathogenic, criteria provided, single submitter	research	HudsonAlpha Institute for Biotechnology, HudsonAlpha Institute for Biotechnology	Nov 12, 2015	- -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

May 13, 2023

This missense change has been observed in individual(s) with thrombocytopenia (PMID: 23434115, 25949529, 30351444, 31064749, 31237726; Invitae). It has also been observed to segregate with disease in related individuals. For these reasons, this variant has been classified as Pathogenic. Experimental studies have shown that this missense change affects ACTN1 function (PMID: 23434115, 26453073). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on ACTN1 protein function. ClinVar contains an entry for this variant (Variation ID: 42028). This variant is not present in population databases (gnomAD no frequency). This sequence change replaces valine, which is neutral and non-polar, with isoleucine, which is neutral and non-polar, at codon 105 of the ACTN1 protein (p.Val105Ile). -

Macrothrombocytopenia Pathogenic:1

Likely pathogenic, criteria provided, single submitter

research

NIHR Bioresource Rare Diseases, University of Cambridge

Feb 01, 2019

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.69
BayesDel_addAF	Pathogenic	0.22	D
BayesDel_noAF	Uncertain	0.090
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.52	D;.;.;T;.;.;T;T;T;T
Eigen	Uncertain	0.62
Eigen_PC	Uncertain	0.64
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Pathogenic	0.99	D;D;D;D;D;D;D;D;D;D
M_CAP	Pathogenic	0.57	D
MetaRNN	Pathogenic	0.88	D;D;D;D;D;D;D;D;D;D
MetaSVM	Pathogenic	0.95	D
MutationAssessor	Benign	1.2	L;L;L;.;L;.;.;.;.;.
PrimateAI	Pathogenic	0.83	D
PROVEAN	Benign	-0.89	N;N;N;N;N;N;N;N;N;N
REVEL	Uncertain	0.45
Sift	Uncertain	0.0090	D;D;D;D;D;D;T;D;T;D
Sift4G	Benign	0.088	T;T;T;T;T;.;.;.;T;.
Polyphen		0.97	D;.;P;.;.;.;.;.;.;.
Vest4		0.58
MutPred		0.77		Gain of catalytic residue at K103 (P = 0.0208);Gain of catalytic residue at K103 (P = 0.0208);Gain of catalytic residue at K103 (P = 0.0208);.;Gain of catalytic residue at K103 (P = 0.0208);.;.;.;.;.;
MVP		0.84
MPC		1.7
ClinPred		0.96	D
GERP RS		4.9
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.45
gMVP		0.82

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

LitVar

Other links and lift over

dbSNP: rs387907345; hg19: chr14-69387750;