chr20-34978070-C-T

Position:

chr20-34978070-C-T

Variant summary

Our verdict is Benign. Variant got -9 ACMG points: 0P and 9B. BP4_StrongBS1_SupportingBS2

The NM_020884.7(MYH7B):c.65C>T(p.Thr22Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000052 in 1,613,960 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. 15/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.00020 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000036 ( 2 hom. )

Consequence

MYH7B
NM_020884.7 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 2.78

Variant links:

Genes affected

MYH7B (HGNC:15906): (myosin heavy chain 7B) The myosin II molecule is a multi-subunit complex consisting of two heavy chains and four light chains. This gene encodes a heavy chain of myosin II, which is a member of the motor-domain superfamily. The heavy chain includes a globular motor domain, which catalyzes ATP hydrolysis and interacts with actin, and a tail domain in which heptad repeat sequences promote dimerization by interacting to form a rod-like alpha-helical coiled coil. This heavy chain subunit is a slow-twitch myosin. Alternatively spliced transcript variants have been found, but the full-length nature of these variants is not determined. [provided by RefSeq, Mar 2010]

MYH7B links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -9 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.031615198).

BS1

Variant frequency is greater than expected in population amr. gnomad4 allele frequency = 0.000204 (31/152154) while in subpopulation AMR AF= 0.0019 (29/15290). AF 95% confidence interval is 0.00136. There are 0 homozygotes in gnomad4. There are 21 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

BS2

High AC in GnomAd4 at 31 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MYH7B	NM_020884.7 linkuse as main transcript	c.65C>T	p.Thr22Met	missense_variant	5/45	ENST00000262873.13	NP_065935.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris
MYH7B	ENST00000262873.13 linkuse as main transcript	c.65C>T	p.Thr22Met	missense_variant	5/45	1	NM_020884.7	ENSP00000262873	P1
MYH7B	ENST00000470929.5 linkuse as main transcript	n.151C>T		non_coding_transcript_exon_variant	2/6	2
MYH7B	ENST00000673749.1 linkuse as main transcript	n.599C>T		non_coding_transcript_exon_variant	5/9

Frequencies

GnomAD3 genomes

AF:

0.000204

AC:

AN:

152036

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00190

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:

0.0000722

AC:

AN:

249434

Hom.:

AF XY:

0.0000887

AC XY:

AN XY:

135330

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000406

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:

0.0000353

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000363

AC:

AN:

1461806

Hom.:

Cov.:

AF XY:

0.0000413

AC XY:

AN XY:

727204

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.000715

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:

0.0000153

Gnomad4 OTH exome

AF:

0.0000497

GnomAD4 genome

AF:

0.000204

AC:

AN:

152154

Hom.:

Cov.:

AF XY:

0.000282

AC XY:

AN XY:

74366

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00190

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:

0.0000550

Hom.:

Bravo

AF:

0.000144

ExAC

AF:

0.0000412

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jun 01, 2023

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. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt MYH7B protein function. ClinVar contains an entry for this variant (Variation ID: 1388750). This variant has not been reported in the literature in individuals affected with MYH7B-related conditions. This variant is present in population databases (rs41312286, gnomAD 0.04%). This sequence change replaces threonine, which is neutral and polar, with methionine, which is neutral and non-polar, at codon 64 of the MYH7B protein (p.Thr64Met). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.062

BayesDel_addAF

Benign

-0.36

BayesDel_noAF

Benign

-0.44

CADD

Benign

DANN

Benign

0.85

Eigen

Benign

-0.64

Eigen_PC

Benign

-0.46

FATHMM_MKL

Benign

0.067

LIST_S2

Benign

0.57

T;T

M_CAP

Benign

0.030

MetaRNN

Benign

0.032

T;T

MetaSVM

Benign

-0.80

MutationTaster

Benign

1.0

PrimateAI

Benign

0.33

PROVEAN

Benign

2.0

N;.

REVEL

Benign

0.11

Sift

Benign

0.16

T;.

Sift4G

Benign

0.20

T;T

Vest4

0.050

MVP

0.42

MPC

0.15

ClinPred

0.046

GERP RS

2.4

Varity_R

0.027

gMVP

0.42

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

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