17-47209433-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_002476.2(MYL4):c.11A>G(p.Lys4Arg) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. 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)
• Consequence: MYL4 NM_002476.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.40

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.40301406).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYL4	NM_002476.2	c.11A>G	p.Lys4Arg	missense_variant	1/7	ENST00000393450.5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MYL4	ENST00000393450.5	c.11A>G	p.Lys4Arg	missense_variant	1/7	1	NM_002476.2	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Atrial fibrillation, familial, 18 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Feb 03, 2022

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. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. 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"). This sequence change replaces lysine, which is basic and polar, with arginine, which is basic and polar, at codon 4 of the MYL4 protein (p.Lys4Arg). This variant has not been reported in the literature in individuals affected with MYL4-related conditions. This variant is not present in population databases (gnomAD no frequency). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.10
BayesDel_addAF	Uncertain	0.072	D
BayesDel_noAF	Benign	-0.14
Cadd	Uncertain	23
Dann	Uncertain	0.99
DEOGEN2	Uncertain	0.43	T;T;T;.;T;T
Eigen	Uncertain	0.45
Eigen_PC	Uncertain	0.41
FATHMM_MKL	Uncertain	0.90	D
M_CAP	Uncertain	0.13	D
MetaRNN	Benign	0.40	T;T;T;T;T;T
MetaSVM	Uncertain	0.48	D
MutationAssessor	Uncertain	2.3	M;M;.;.;M;.
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Uncertain	0.74	T
Sift4G	Benign	0.11	T;T;T;T;T;T
Polyphen		0.96	D;D;.;.;D;.
Vest4		0.35
MutPred		0.29		Loss of methylation at K4 (P = 0.0079);Loss of methylation at K4 (P = 0.0079);Loss of methylation at K4 (P = 0.0079);Loss of methylation at K4 (P = 0.0079);Loss of methylation at K4 (P = 0.0079);Loss of methylation at K4 (P = 0.0079);
MVP		0.87
MPC		0.12
ClinPred		0.75	D
GERP RS		5.4
Varity_R		0.11
gMVP		0.26

Splicing

Name	Calibrated prediction	Score	Prediction
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

No publications associated with this variant yet.

Other links and lift over

hg19: chr17-45286799;