12-110915743-G-C

Variant names:

• chr12-110915743-G-C
• rs199474808
• NM_000432.4:c.141C>G

Variant summary

Our verdict is Uncertain significance. The variant received 5 ACMG points: 5P and 0B. PM1 PM2 PP2

The NM_000432.4(MYL2):​c.141C>G​(p.Asn47Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 14/23 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 nucleotide change resulting in the same amino acid substitution has been previously reported as Uncertain significance in ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. N47Y) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: MYL2 NM_000432.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.580
• Publications: 0 publications found

Genes affected

MYL2 (HGNC:7583): (myosin light chain 2) This gene encodes a major sarcomeric protein in mammalian striated muscle. The encoded protein plays a role in embryonic heart muscle structure and function, while phosphorylation of the encoded protein is involved in cardiac myosin cycling kinetics, torsion and function in adults. Mutations in this gene are associated with hypertrophic cardiomyopathy 10 and infant-onset myopathy. [provided by RefSeq, May 2022]

MYL2 Gene-Disease associations (from GenCC):

• hypertrophic cardiomyopathy

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• hypertrophic cardiomyopathy 10

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: ClinGen, G2P, PanelApp Australia, Labcorp Genetics (formerly Invitae)
• myopathy, myofibrillar, 12, infantile-onset, with cardiomyopathy

  Inheritance: AR Classification: MODERATE Submitted by: Ambry Genetics
• congenital fiber-type disproportion myopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• dilated cardiomyopathy

  Inheritance: AD Classification: LIMITED Submitted by: ClinGen
• arrhythmogenic right ventricular cardiomyopathy

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

ACMG classification

Our verdict: Uncertain_significance. The variant received 5 ACMG points.

• PM1: In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 18 uncertain in NM_000432.4
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 11 curated pathogenic missense variants (we use a threshold of 10). The gene has 2 curated benign missense variants. Gene score misZ: 0.39564 (below the threshold of 3.09). Trascript score misZ: 1.1124 (below the threshold of 3.09). GenCC associations: The gene is linked to hypertrophic cardiomyopathy 10, dilated cardiomyopathy, arrhythmogenic right ventricular cardiomyopathy, hypertrophic cardiomyopathy, myopathy, myofibrillar, 12, infantile-onset, with cardiomyopathy, congenital fiber-type disproportion myopathy.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000432.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MYL2	NM_000432.4	MANE Select	c.141C>G	p.Asn47Lys	missense	Exon 3 of 7	NP_000423.2
	MYL2	NM_001406916.1		c.84C>G	p.Asn28Lys	missense	Exon 3 of 7	NP_001393845.1
	MYL2	NM_001406745.1		c.94-1419C>G		intron	N/A	NP_001393674.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MYL2	ENST00000228841.15	TSL:1 MANE Select	c.141C>G	p.Asn47Lys	missense	Exon 3 of 7	ENSP00000228841.8
	MYL2	ENST00000713800.1		c.141C>G	p.Asn47Lys	missense	Exon 4 of 8	ENSP00000519106.1
	MYL2	ENST00000713803.1		c.141C>G	p.Asn47Lys	missense	Exon 4 of 8	ENSP00000519109.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.52
CardioboostCm	Benign	0.090
BayesDel_addAF	Benign	-0.17	T
BayesDel_noAF	Benign	-0.48
CADD	Benign	2.6
DANN	Uncertain	0.99
DEOGEN2	Benign	0.25	T
Eigen	Benign	-0.70
Eigen_PC	Benign	-0.73
FATHMM_MKL	Benign	0.17	N
LIST_S2	Benign	0.81	T
M_CAP	Benign	0.029	D
MetaRNN	Uncertain	0.52	D
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.21	N
PhyloP100		-0.58
PrimateAI	Pathogenic	0.83	D
PROVEAN	Benign	-0.73	N
REVEL	Benign	0.086
Sift	Uncertain	0.017	D
Sift4G	Benign	0.25	T
Polyphen		0.31	B
Vest4		0.80
MutPred		0.55		Gain of ubiquitination at N47 (P = 0.0155)
MVP		0.62
MPC		0.64
ClinPred		0.88	D
GERP RS		-5.1
Varity_R		0.34
gMVP		0.73
Mutation Taster		=22/78	disease causing

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: rs199474808; hg19: chr12-111353547;