Genetic Variant MYL2:c.274+25_274+26delGT (chr12-110914159-GAC-G) – ACMG Classification: Benign (-8 pts)

Variant summary

Our verdict is Benign. The variant received -8 ACMG points: 0P and 8B. BP6_Very_Strong

The NM_000432.4(MYL2):c.274+25_274+26delGT variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0142 in 1,182,930 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Benign (★★).

Frequency

Genomes: 𝑓 0.000047 ( 0 hom., cov: 31)

Exomes 𝑓: 0.016 ( 0 hom. )

Consequence

MYL2
NM_000432.4 intron

Scores

Not classified

Clinical Significance

Benign criteria provided, multiple submitters, no conflicts B:2

Conservation

PhyloP100: 0.360

Publications

2 publications found

Variant links:

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

MYL2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -8 ACMG points.

BP6

Variant 12-110914159-GAC-G is Benign according to our data. Variant chr12-110914159-GAC-G is described in ClinVar as Benign. ClinVar VariationId is 1278892.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	Effect	Exon rank	MANE	Protein	UniProt
MYL2	NM_000432.4 link	c.274+25_274+26delGT	intron_variant	Intron 4 of 6	ENST00000228841.15	NP_000423.2	P10916Q6IB42
MYL2	NM_001406745.1 link	c.232+25_232+26delGT	intron_variant	Intron 3 of 5		NP_001393674.1
MYL2	NM_001406916.1 link	c.217+25_217+26delGT	intron_variant	Intron 4 of 6		NP_001393845.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MYL2	ENST00000228841.15 link	c.274+25_274+26delGT		intron_variant	Intron 4 of 6	1	NM_000432.4	ENSP00000228841.8		P10916

Frequencies

GnomAD3 genomes

AF:

0.0000467

AC:

AN:

149914

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000735

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000211

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000446

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0228

AC:

2653

AN:

116462

AF XY:

0.0236

show subpopulations

Gnomad AFR exome

AF:

0.0273

Gnomad AMR exome

AF:

0.0178

Gnomad ASJ exome

AF:

0.0124

Gnomad EAS exome

AF:

0.0129

Gnomad FIN exome

AF:

0.0273

Gnomad NFE exome

AF:

0.0296

Gnomad OTH exome

AF:

0.0121

GnomAD4 exome

AF:

0.0163

AC:

16795

AN:

1032914

Hom.:

AF XY:

0.0158

AC XY:

8124

AN XY:

514248

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.0150

AC:

346

AN:

23068

American (AMR)

AF:

0.0108

AC:

314

AN:

29154

Ashkenazi Jewish (ASJ)

AF:

0.0136

AC:

228

AN:

16816

East Asian (EAS)

AF:

0.00852

AC:

252

AN:

29586

South Asian (SAS)

AF:

0.00699

AC:

430

AN:

61518

European-Finnish (FIN)

AF:

0.0121

AC:

462

AN:

38066

Middle Eastern (MID)

AF:

0.00750

AC:

AN:

4400

European-Non Finnish (NFE)

AF:

0.0179

AC:

14114

AN:

788216

Other (OTH)

AF:

0.0146

AC:

616

AN:

42090

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.248

Heterozygous variant carriers

2392

4785

7177

9570

11962

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

650

1300

1950

2600

3250

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000467

AC:

AN:

150016

Hom.:

Cov.:

AF XY:

0.0000547

AC XY:

AN XY:

73158

show subpopulations

African (AFR)

AF:

0.0000732

AC:

AN:

40958

American (AMR)

AF:

0.00

AC:

AN:

15028

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3442

East Asian (EAS)

AF:

0.00

AC:

AN:

5142

South Asian (SAS)

AF:

0.000212

AC:

AN:

4726

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10162

Middle Eastern (MID)

AF:

0.00

AC:

AN:

284

European-Non Finnish (NFE)

AF:

0.0000446

AC:

AN:

67298

Other (OTH)

AF:

0.00

AC:

AN:

2064

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.418

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.0727

Hom.:

ClinVar

Significance: Benign

Submissions summary: Benign:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Cardiomyopathy

Benign:1

Aug 20, 2021

CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not provided

Benign:1

Mar 03, 2015

GeneDx

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

PhyloP100

0.36

Mutation Taster

=100/0

polymorphism

(source)

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

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12-110914159-GACACACACAC-GACACACAC

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over