17-10628672-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 3P and 2B. PM2 PP2 BP4_Moderate

The NM_002470.4(MYH3):c.5804T>C(p.Val1935Ala) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: MYH3 NM_002470.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:2
• Conservation: PhyloP100: 4.27

Genes affected

MYH3 (HGNC:7573): (myosin heavy chain 3) Myosin is a major contractile protein which converts chemical energy into mechanical energy through the hydrolysis of ATP. Myosin is a hexameric protein composed of a pair of myosin heavy chains (MYH) and two pairs of nonidentical light chains. This gene is a member of the MYH family and encodes a protein with an IQ domain and a myosin head-like domain. Mutations in this gene have been associated with two congenital contracture (arthrogryposis) syndromes, Freeman-Sheldon syndrome and Sheldon-Hall syndrome. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, MYH3
• BP4: Computational evidence support a benign effect (MetaRNN=0.15233818).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYH3	NM_002470.4	c.5804T>C	p.Val1935Ala	missense_variant	41/41	ENST00000583535.6
MYH3	XM_011523870.4	c.5804T>C	p.Val1935Ala	missense_variant	41/41
MYH3	XM_011523871.3	c.5804T>C	p.Val1935Ala	missense_variant	41/41
MYH3	XM_047436127.1	c.5804T>C	p.Val1935Ala	missense_variant	43/43

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MYH3	ENST00000583535.6	c.5804T>C	p.Val1935Ala	missense_variant	41/41	5	NM_002470.4	P1
MYH3	ENST00000577963.1	n.346T>C		non_coding_transcript_exon_variant	2/2	2
MYH3	ENST00000579928.2	n.334T>C		non_coding_transcript_exon_variant	3/3	2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, single submitter

Submissions by phenotype

Freeman-Sheldon syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Distal arthrogryposis type 2B1 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.085
BayesDel_addAF	Uncertain	0.033	T
BayesDel_noAF	Benign	-0.19
Cadd	Benign	22
Dann	Uncertain	0.99
DEOGEN2	Benign	0.12	T
Eigen	Benign	-0.25
Eigen_PC	Benign	-0.023
FATHMM_MKL	Uncertain	0.81	D
LIST_S2	Benign	0.65	T
M_CAP	Benign	0.054	D
MetaRNN	Benign	0.15	T
MetaSVM	Benign	-0.56	T
MutationAssessor	Benign	0.20	N
MutationTaster	Benign	0.94	D;D
PrimateAI	Uncertain	0.58	T
Sift4G	Benign	0.55	T
Polyphen		0.0	B
Vest4		0.28
MutPred		0.11		Loss of stability (P = 0.0779);
MVP		0.78
MPC		0.30
ClinPred		0.58	D
GERP RS		5.5
Varity_R		0.064
gMVP		0.27

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: rs886052577; hg19: chr17-10531989;