20-31819596-G-A

Position:

• chr20-31819596-G-A

Variant summary

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

The NM_033118.4(MYLK2):​c.16G>A​(p.Gly6Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000214 in 1,399,276 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G6E) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: MYLK2 NM_033118.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.26

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=0.18669769).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYLK2	NM_033118.4	c.16G>A	p.Gly6Arg	missense_variant	2/13	ENST00000375985.5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MYLK2	ENST00000375985.5	c.16G>A	p.Gly6Arg	missense_variant	2/13	1	NM_033118.4	P1
MYLK2	ENST00000375994.6	c.16G>A	p.Gly6Arg	missense_variant	1/12	1		P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000214 AC: 3 AN: 1399276 Hom.: 0 Cov.: 31 AF XY: 0.00000145 AC XY: 1 AN XY: 690134

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: 0.00000278

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

May 28, 2014

The Gly6Arg variant in MYLK2 has not been previously reported in individuals wit h cardiomyopathy and was absent from large population studies. Computational pre diction tools and conservation analyses do not provide strong support for or aga inst an impact to the protein. In summary, the clinical significance of the Gly6 Arg variant is uncertain. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.21
BayesDel_addAF	Uncertain	0.078	D
BayesDel_noAF	Benign	-0.13
CADD	Benign	23
DANN	Pathogenic	1.0
DEOGEN2	Benign	0.27	T;T
Eigen	Benign	-0.32
Eigen_PC	Benign	-0.21
FATHMM_MKL	Benign	0.65	D
LIST_S2	Benign	0.74	.;T
M_CAP	Uncertain	0.097	D
MetaRNN	Benign	0.19	T;T
MetaSVM	Benign	-0.35	T
MutationAssessor	Benign	1.9	L;L
MutationTaster	Benign	0.51	D;D
PrimateAI	Uncertain	0.54	T
PROVEAN	Benign	-0.61	N;N
REVEL	Benign	0.16
Sift	Pathogenic	0.0	D;D
Sift4G	Benign	0.19	T;T
Polyphen		0.020	B;B
Vest4		0.24
MutPred		0.29		Gain of sheet (P = 0.039);Gain of sheet (P = 0.039);
MVP		0.80
MPC		0.49
ClinPred		0.85	D
GERP RS		2.5
Varity_R		0.22
gMVP		0.068

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.10		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: rs727503302; hg19: chr20-30407399;