20-34977669-C-T

Position:

chr20-34977669-C-T

Variant summary

Our verdict is Benign. Variant got -7 ACMG points: 0P and 7B. BP4_ModerateBS1_SupportingBS2

The NM_020884.7(MYH7B):c.-84C>T variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000247 in 1,376,236 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.00010 ( 0 hom., cov: 28)

Exomes 𝑓: 0.000017 ( 0 hom. )

Consequence

MYH7B
NM_020884.7 5_prime_UTR

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -0.202

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 -7 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.09736079).

BS1

Variant frequency is greater than expected in population amr. gnomad4 allele frequency = 0.000104 (13/125490) while in subpopulation AMR AF= 0.000675 (7/10364). AF 95% confidence interval is 0.000316. There are 0 homozygotes in gnomad4. There are 10 alleles in male gnomad4 subpopulation. Median coverage is 28. 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 13 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MYH7B	NM_020884.7 linkuse as main transcript	c.-84C>T		5_prime_UTR_variant	4/45	ENST00000262873.13	NP_065935.4

Ensembl

Gene	Transcript	HGVSc	Effect	#exon/exons	TSL	MANE	Protein	Appris
MYH7B	ENST00000262873.13 linkuse as main transcript	c.-84C>T	5_prime_UTR_variant	4/45	1	NM_020884.7	ENSP00000262873	P1
MYH7B	ENST00000470929.5 linkuse as main transcript	n.3C>T	non_coding_transcript_exon_variant	1/6	2
MYH7B	ENST00000673749.1 linkuse as main transcript	n.451C>T	non_coding_transcript_exon_variant	4/9

Frequencies

GnomAD3 genomes

AF:

0.000104

AC:

AN:

125490

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000180

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000675

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000503

AC:

AN:

198716

Hom.:

AF XY:

0.0000659

AC XY:

AN XY:

106258

show subpopulations

Gnomad AFR exome

AF:

0.0000869

Gnomad AMR exome

AF:

0.000319

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:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000168

AC:

AN:

1250746

Hom.:

Cov.:

AF XY:

0.0000227

AC XY:

AN XY:

616830

show subpopulations

Gnomad4 AFR exome

AF:

0.000107

Gnomad4 AMR exome

AF:

0.000267

Gnomad4 ASJ exome

AF:

0.0000533

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000713

Gnomad4 OTH exome

AF:

0.0000211

GnomAD4 genome

AF:

0.000104

AC:

AN:

125490

Hom.:

Cov.:

AF XY:

0.000169

AC XY:

AN XY:

59112

show subpopulations

Gnomad4 AFR

AF:

0.000180

Gnomad4 AMR

AF:

0.000675

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000793

ExAC

AF:

0.00000840

AC:

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

Apr 01, 2022

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 output the following: SIFT: "Deleterious"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0". The cysteine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. This variant has not been reported in the literature in individuals affected with MYH7B-related conditions. The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This sequence change replaces arginine, which is basic and polar, with cysteine, which is neutral and slightly polar, at codon 15 of the MYH7B protein (p.Arg15Cys). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.17

BayesDel_addAF

Benign

-0.14

BayesDel_noAF

Benign

-0.44

CADD

Benign

DANN

Uncertain

0.99

DEOGEN2

Uncertain

0.68

D;.

Eigen

Benign

-0.22

Eigen_PC

Benign

-0.27

FATHMM_MKL

Benign

0.20

LIST_S2

Benign

0.58

T;T

M_CAP

Uncertain

0.22

MetaRNN

Benign

0.097

T;T

MetaSVM

Uncertain

-0.19

MutationTaster

Benign

0.92

PrimateAI

Benign

0.32

PROVEAN

Benign

-0.18

N;.

REVEL

Benign

0.16

Sift

Uncertain

0.017

D;.

Vest4

0.19

MutPred

0.35

Loss of MoRF binding (P = 0.0077);.;

MVP

0.57

MPC

0.64

ClinPred

0.15

GERP RS

0.60

Varity_R

0.10

gMVP

0.60

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