NM_002476.2:c.30G>C

Variant names:

• chr17-47209452-G-C
• rs140092425
• NM_002476.2:c.30G>C

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_002476.2(MYL4):​c.30G>C​(p.Lys10Asn) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000205 in 1,461,878 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: MYL4 NM_002476.2 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 1.91
• Publications: 0 publications found

Genes affected

MYL4 (HGNC:7585): (myosin light chain 4) Myosin is a hexameric ATPase cellular motor protein. It is composed of two myosin heavy chains, two nonphosphorylatable myosin alkali light chains, and two phosphorylatable myosin regulatory light chains. This gene encodes a myosin alkali light chain that is found in embryonic muscle and adult atria. Two alternatively spliced transcript variants encoding the same protein have been found for this gene. [provided by RefSeq, Jul 2008]

MYL4 Gene-Disease associations (from GenCC):

• atrial fibrillation, familial, 18

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• familial atrial fibrillation

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.17129108).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MYL4	NM_002476.2	c.30G>C	p.Lys10Asn	missense_variant	Exon 1 of 7	ENST00000393450.5	NP_002467.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MYL4	ENST00000393450.5	c.30G>C	p.Lys10Asn	missense_variant	Exon 1 of 7	1	NM_002476.2	ENSP00000377096.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1461878 Hom.: 0 Cov.: 31 AF XY: 0.00000413 AC XY: 3 AN XY: 727238

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53406

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00000270 AC: 3 AN: 1112010

Other (OTH) AF: 0.00 AC: 0 AN: 60396

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Uncertain:1

Mar 22, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.30G>C (p.K10N) alteration is located in exon 2 (coding exon 1) of the MYL4 gene. This alteration results from a G to C substitution at nucleotide position 30, causing the lysine (K) at amino acid position 10 to be replaced by an asparagine (N). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Atrial fibrillation, familial, 18 Uncertain:1

Dec 27, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces lysine, which is basic and polar, with asparagine, which is neutral and polar, at codon 10 of the MYL4 protein (p.Lys10Asn). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with MYL4-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Not Available"; Align-GVGD: "Class C0"). 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
AlphaMissense	Pathogenic	0.61
BayesDel_addAF	Benign	-0.00045	T
BayesDel_noAF	Benign	-0.24
CADD	Benign	22
DANN	Uncertain	0.98
DEOGEN2	Uncertain	0.47	T;T;T;.;T;T
Eigen	Benign	-0.35
Eigen_PC	Benign	-0.29
FATHMM_MKL	Uncertain	0.80	D
LIST_S2	Benign	0.81	.;T;T;T;.;T
M_CAP	Benign	0.066	D
MetaRNN	Benign	0.17	T;T;T;T;T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Uncertain	2.8	M;M;.;.;M;.
PhyloP100		1.9
PrimateAI	Pathogenic	0.85	D
PROVEAN	Benign	-1.4	.;N;.;.;N;.
REVEL	Benign	0.025
Sift	Uncertain	0.0020	.;D;.;.;D;.
Sift4G	Uncertain	0.010	D;D;D;D;D;D
Polyphen		0.23	B;B;.;.;B;.
Vest4		0.45
MutPred		0.21		Loss of methylation at K10 (P = 0.0033);Loss of methylation at K10 (P = 0.0033);Loss of methylation at K10 (P = 0.0033);Loss of methylation at K10 (P = 0.0033);Loss of methylation at K10 (P = 0.0033);Loss of methylation at K10 (P = 0.0033);
MVP		0.87
MPC		0.18
ClinPred		0.53	D
GERP RS		3.4
PromoterAI		-0.0040	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.17
gMVP		0.36
Mutation Taster		=70/30	polymorphism

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: rs140092425; hg19: chr17-45286818;