16-15714963-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP2

The NM_002474.3(MYH11):c.5732C>G(p.Thr1911Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 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. T1911M) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: MYH11 NM_002474.3 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 2.70

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]

NDE1 (HGNC:17619): (nudE neurodevelopment protein 1) This gene encodes a member of the nuclear distribution E (NudE) family of proteins. The encoded protein is localized at the centrosome and interacts with other centrosome components as part of a multiprotein complex that regulates dynein function. This protein plays an essential role in microtubule organization, mitosis and neuronal migration. Mutations in this gene cause lissencephaly 4, a disorder characterized by lissencephaly, severe brain atrophy, microcephaly, and severe cognitive disability. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Mar 2012]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, MYH11

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYH11	NM_002474.3	c.5732C>G	p.Thr1911Arg	missense_variant	40/41	ENST00000300036.6
MYH11	NM_001040113.2	c.5753C>G	p.Thr1918Arg	missense_variant	41/43	ENST00000452625.7
NDE1	NM_017668.3	c.948-9228G>C		intron_variant		ENST00000396354.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MYH11	ENST00000300036.6	c.5732C>G	p.Thr1911Arg	missense_variant	40/41	1	NM_002474.3	P3
MYH11	ENST00000452625.7	c.5753C>G	p.Thr1918Arg	missense_variant	41/43	1	NM_001040113.2
NDE1	ENST00000396354.6	c.948-9228G>C		intron_variant		1	NM_017668.3	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Jan 28, 2021

Variant summary: MYH11 c.5753C>G (p.Thr1918Arg) results in a non-conservative amino acid change located in the Myosin tail domain (IPR002928) of the encoded protein sequence. Four of five in-silico tools predict a damaging effect of the variant on protein function. The variant was absent in 251046 control chromosomes. The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. To our knowledge, no occurrence of c.5753C>G in individuals affected with Thoracic Aortic Aneurysms And Dissections and no experimental evidence demonstrating its impact on protein function have been reported. One clinical diagnostic laboratory has submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation and classified the variant as uncertain significance. Based on the evidence outlined above, the variant was classified as uncertain significance. -

Aortic aneurysm, familial thoracic 4 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Feb 12, 2019

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. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals with MYH11-related conditions. This variant is not present in population databases (ExAC no frequency). This sequence change replaces threonine with arginine at codon 1918 of the MYH11 protein (p.Thr1918Arg). The threonine residue is highly conserved and there is a moderate physicochemical difference between threonine and arginine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.42
BayesDel_addAF	Uncertain	0.061	T
BayesDel_noAF	Benign	-0.15
Cadd	Pathogenic	27
Dann	Uncertain	1.0
Eigen	Uncertain	0.50
Eigen_PC	Uncertain	0.48
FATHMM_MKL	Uncertain	0.80	D
LIST_S2	Uncertain	0.97	D;D;D;D
M_CAP	Uncertain	0.096	D
MetaRNN	Uncertain	0.51	D;D;D;D
MetaSVM	Uncertain	0.12	D
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D
PrimateAI	Uncertain	0.64	T
PROVEAN	Uncertain	-3.0	D;D;.;D
REVEL	Uncertain	0.50
Sift	Benign	0.040	D;D;.;D
Sift4G	Benign	0.44	T;T;T;T
Polyphen		0.89	.;.;.;P
Vest4		0.56
MutPred		0.41		.;.;Loss of phosphorylation at T1911 (P = 0.0243);Loss of phosphorylation at T1911 (P = 0.0243);
MVP		0.76
MPC		0.40
ClinPred		0.98	D
GERP RS		4.8
Varity_R		0.42
gMVP		0.46

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: rs748516947; hg19: chr16-15808820;