chr16-15735442-G-T

Position:

• chr16-15735442-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP2 PP3

The NM_002474.3(MYH11):​c.3430C>A​(p.Leu1144Ile) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. L1144L) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: MYH11 NM_002474.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.94

Genes affected

MYH11 (HGNC:7569): (myosin heavy chain 11) The protein encoded by this gene is a smooth muscle myosin belonging to the myosin heavy chain family. The gene product is a subunit of a hexameric protein that consists of two heavy chain subunits and two pairs of non-identical light chain subunits. It functions as a major contractile protein, converting chemical energy into mechanical energy through the hydrolysis of ATP. A chromosomal rearrangement involving this gene is associated with acute myeloid leukemia of the M4Eo subtype. Mutations in this gene are associated with visceral myopathy, megacystis-microcolon-intestinal hypoperistalsis syndrome 2, and familial thoracic aortic aneurysm 4. [provided by RefSeq, May 2022]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), MYH11. . Gene score misZ 1.4389 (greater than the threshold 3.09). Trascript score misZ 3.4142 (greater than threshold 3.09). GenCC has associacion of gene with aortic aneurysm, familial thoracic 4, visceral myopathy 2, familial thoracic aortic aneurysm and aortic dissection, megacystis-microcolon-intestinal hypoperistalsis syndrome 2, megacystis-microcolon-intestinal hypoperistalsis syndrome.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.823

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYH11	NM_002474.3	c.3430C>A	p.Leu1144Ile	missense_variant	26/41	ENST00000300036.6
MYH11	NM_001040113.2	c.3451C>A	p.Leu1151Ile	missense_variant	27/43	ENST00000452625.7
MYH11	NM_001040114.2	c.3451C>A	p.Leu1151Ile	missense_variant	27/42
MYH11	NM_022844.3	c.3430C>A	p.Leu1144Ile	missense_variant	26/42

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MYH11	ENST00000300036.6	c.3430C>A	p.Leu1144Ile	missense_variant	26/41	1	NM_002474.3	P3
MYH11	ENST00000452625.7	c.3451C>A	p.Leu1151Ile	missense_variant	27/43	1	NM_001040113.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Aortic aneurysm, familial thoracic 4 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

May 20, 2017

In summary, this variant has uncertain impact on MYH11 function. The available evidence is currently insufficient to determine its role in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals with a MYH11-related disease. This variant is not present in population databases (ExAC no frequency). This sequence change replaces leucine with isoleucine at codon 1151 of the MYH11 protein (p.Leu1151Ile). The leucine residue is highly conserved and there is a small physicochemical difference between leucine and isoleucine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.29
BayesDel_addAF	Uncertain	0.14	D
BayesDel_noAF	Uncertain	-0.030
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.52	.;.;.;D
Eigen	Pathogenic	0.72
Eigen_PC	Pathogenic	0.67
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.95	D;D;D;D
M_CAP	Pathogenic	0.30	D
MetaRNN	Pathogenic	0.82	D;D;D;D
MetaSVM	Uncertain	0.59	D
MutationAssessor	Pathogenic	2.9	.;.;M;M
MutationTaster	Benign	1.0	D;D;D;D;D
PrimateAI	Uncertain	0.79	T
PROVEAN	Benign	-1.8	N;N;.;N
REVEL	Pathogenic	0.69
Sift	Uncertain	0.0030	D;D;.;D
Sift4G	Uncertain	0.014	D;D;D;D
Polyphen		1.0	.;.;.;D
Vest4		0.64
MutPred		0.67		.;.;Gain of methylation at K1141 (P = 0.0602);Gain of methylation at K1141 (P = 0.0602);
MVP		0.66
MPC		0.44
ClinPred		0.97	D
GERP RS		5.2
Varity_R		0.31
gMVP		0.22

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

Publications

LitVar

Other links and lift over

dbSNP: rs1555556567; hg19: chr16-15829299;