12-110911150-G-A

Position:

chr12-110911150-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 4P and 4B. PM1PP3_ModerateBS2

The NM_000432.4(MYL2):c.428C>T(p.Pro143Leu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000242 in 1,613,640 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 31)

Exomes 𝑓: 0.000025 ( 0 hom. )

Consequence

MYL2
NM_000432.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:6

Conservation

PhyloP100: 9.55

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 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 0 ACMG points.

PM1

In a chain Myosin regulatory light chain 2, ventricular/cardiac muscle isoform (size 164) in uniprot entity MLRV_HUMAN there are 33 pathogenic changes around while only 3 benign (92%) in NM_000432.4

PP3

MetaRNN computational evidence supports a deleterious effect, 0.91

BS2

High AC in GnomAdExome4 at 37 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein
MYL2	NM_000432.4 linkuse as main transcript	c.428C>T	p.Pro143Leu	missense_variant	7/7	ENST00000228841.15	NP_000423.2
MYL2	NM_001406745.1 linkuse as main transcript	c.386C>T	p.Pro129Leu	missense_variant	6/6		NP_001393674.1
MYL2	NM_001406916.1 linkuse as main transcript	c.371C>T	p.Pro124Leu	missense_variant	7/7		NP_001393845.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris
MYL2	ENST00000228841.15 linkuse as main transcript	c.428C>T	p.Pro143Leu	missense_variant	7/7	1	NM_000432.4	ENSP00000228841	P1
MYL2	ENST00000548438.1 linkuse as main transcript	c.386C>T	p.Pro129Leu	missense_variant	6/6	3		ENSP00000447154
MYL2	ENST00000663220.1 linkuse as main transcript	c.371C>T	p.Pro124Leu	missense_variant	7/7			ENSP00000499568

Frequencies

GnomAD3 genomes

AF:

0.0000132

AC:

AN:

151950

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000201

AC:

AN:

248938

Hom.:

AF XY:

0.0000223

AC XY:

AN XY:

134734

show subpopulations

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:

0.0000449

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000253

AC:

AN:

1461690

Hom.:

Cov.:

AF XY:

0.0000275

AC XY:

AN XY:

727126

show subpopulations

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:

0.0000333

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000132

AC:

AN:

151950

Hom.:

Cov.:

AF XY:

0.0000270

AC XY:

AN XY:

74210

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000294

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000946

Hom.:

Bravo

AF:

0.0000264

TwinsUK

AF:

0.000539

AC:

ALSPAC

AF:

0.00

AC:

ExAC

AF:

0.0000247

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Blueprint Genetics	Sep 09, 2015	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	May 01, 2014	The Pro143Leu variant in MYL2 has been identified by our laboratory in 1 African American teenager with HCM, who also carried a pathogenic variant in the MYBPC3 gene and had an earlier presentation than his mother, who only carried the MYBP C3 variant. This variant was absent from large population studies. Proline (Pro) at position 143 is highly conserved in evolution and the change to leucine (Leu ) was predicted to be pathogenic using a computational tool clinically validated by our laboratory. This tool's pathogenic prediction is estimated to be correct 94% of the time (Jordan 2011). Additional information is needed to fully assess the clinical significance of the Pro143Leu variant. -

Hypertrophic cardiomyopathy 10

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Dec 29, 2023

This sequence change replaces proline, which is neutral and non-polar, with leucine, which is neutral and non-polar, at codon 143 of the MYL2 protein (p.Pro143Leu). This variant is present in population databases (rs727504341, gnomAD 0.006%). This missense change has been observed in individual(s) with hypertrophic cardiomyopathy (PMID: 27532257). ClinVar contains an entry for this variant (Variation ID: 177824). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. 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. -

Hypertrophic cardiomyopathy 10;C5561937:Myopathy, myofibrillar, 12, infantile-onset, with cardiomyopathy

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Nov 22, 2021

- -

Hypertrophic cardiomyopathy

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

All of Us Research Program, National Institutes of Health

Dec 13, 2023

This missense variant replaces proline with leucine at codon 143 of the MYL2 protein. Computational prediction suggests that this variant may have deleterious impact on protein structure and function (internally defined REVEL score threshold >= 0.7, PMID: 27666373). Splice site prediction tools suggest that this variant may not impact RNA splicing. To our knowledge, functional studies have not been performed for this variant. This variant has been reported in an individual affected with hypertrophic cardiomyopathy (PMID: 27532257). This variant has also been reported in an individual from a cohort of participants that were not pre-selected for a personal or family history of cardiovascular disorders (PMID: 22958901). This variant has been identified in 7/280276 chromosomes in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. -

Cardiovascular phenotype

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Aug 30, 2023

The p.P143L variant (also known as c.428C>T), located in coding exon 7 of the MYL2 gene, results from a C to T substitution at nucleotide position 428. The proline at codon 143 is replaced by leucine, an amino acid with similar properties. This alteration has been reported in the Framingham Heart Study cohort; however, clinical details were limited (Bick AG et al. Am J Hum Genet, 2012 Sep;91:513-9). Additionally, this alteration has also been detected in an individual who underwent genetic testing for hypertrophic cardiomyopathy, and in individual from a pediatric dilated cardiomyopathy cohort; however, clinical details were limited (Walsh R et al. Genet Med, 2017 02;19:192-203). This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.36

CardioboostCm

Uncertain

0.78

BayesDel_addAF

Pathogenic

0.23

BayesDel_noAF

Pathogenic

0.22

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.82

D;.

Eigen

Pathogenic

0.86

Eigen_PC

Pathogenic

0.79

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Uncertain

0.91

D;D

M_CAP

Pathogenic

0.57

MetaRNN

Pathogenic

0.91

D;D

MetaSVM

Uncertain

0.48

MutationAssessor

Uncertain

2.9

M;.

MutationTaster

Benign

1.0

D;D

PrimateAI

Uncertain

0.74

PROVEAN

Pathogenic

-7.5

D;D

REVEL

Pathogenic

0.87

Sift

Pathogenic

0.0

D;D

Sift4G

Uncertain

0.0050

D;D

Polyphen

1.0

D;.

Vest4

0.83

MutPred

0.56

Gain of catalytic residue at A141 (P = 9e-04);.;

MVP

0.93

MPC

1.2

ClinPred

0.99

GERP RS

5.0

Varity_R

0.79

gMVP

0.80

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over