rs779637525

Positions:

• chr20-31826918-G-A
• chr20-31826918-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_033118.4(MYLK2):​c.1204G>A​(p.Val402Ile) variant causes a missense change. The variant allele was found at a frequency of 0.000000684 in 1,461,888 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. 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. V402F) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: MYLK2 NM_033118.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 4.11

Genes affected

MYLK2 (HGNC:16243): (myosin light chain kinase 2) This gene encodes a myosin light chain kinase, a calcium/calmodulin dependent enzyme, that is exclusively expressed in adult skeletal muscle. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.11106333).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MYLK2	NM_033118.4	c.1204G>A	p.Val402Ile	missense_variant	8/13	ENST00000375985.5	NP_149109.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MYLK2	ENST00000375985.5	c.1204G>A	p.Val402Ile	missense_variant	8/13	1	NM_033118.4	ENSP00000365152	P1
MYLK2	ENST00000375994.6	c.1204G>A	p.Val402Ile	missense_variant	7/12	1		ENSP00000365162	P1
MYLK2	ENST00000468730.1	n.142G>A		non_coding_transcript_exon_variant	1/6	1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD3 exomes AF: 0.00000398 AC: 1 AN: 251390 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 135882

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000880

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461888 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 727246

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: 0.00

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 31

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.15
BayesDel_addAF	Benign	-0.21	T
BayesDel_noAF	Benign	-0.55
CADD	Benign	22
DANN	Benign	0.97
DEOGEN2	Benign	0.20	T;T
Eigen	Benign	-0.56
Eigen_PC	Benign	-0.31
FATHMM_MKL	Uncertain	0.80	D
LIST_S2	Benign	0.85	.;T
M_CAP	Benign	0.015	T
MetaRNN	Benign	0.11	T;T
MetaSVM	Benign	-0.99	T
MutationAssessor	Benign	-1.0	N;N
MutationTaster	Benign	0.97	D;D
PrimateAI	Uncertain	0.61	T
PROVEAN	Benign	0.44	N;N
REVEL	Benign	0.12
Sift	Benign	1.0	T;T
Sift4G	Benign	1.0	T;T
Polyphen		0.070	B;B
Vest4		0.20
MutPred		0.61		Gain of catalytic residue at L407 (P = 0.0642);Gain of catalytic residue at L407 (P = 0.0642);
MVP		0.56
MPC		0.30
ClinPred		0.31	T
GERP RS		3.9
Varity_R		0.068
gMVP		0.18

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.11		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: rs779637525; hg19: chr20-30414721;