22-25877960-A-T

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_032608.7(MYO18B):c.4226A>T(p.Glu1409Val) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000255 in 1,569,886 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 33)

Exomes 𝑓: 7.1e-7 ( 0 hom. )

Consequence

MYO18B
NM_032608.7 missense, splice_region

Scores

Splicing: ADA: 0.0001429

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 2.16

Variant links:

Genes affected

MYO18B (HGNC:18150): (myosin XVIIIB) The protein encoded by this gene may regulate muscle-specific genes when in the nucleus and may influence intracellular trafficking when in the cytoplasm. The encoded protein functions as a homodimer and may interact with F actin. Mutations in this gene are associated with lung cancer. [provided by RefSeq, Jul 2008]

MYO18B links:

MYO18B-AS1 (HGNC:40831): (MYO18B antisense RNA 1)

MYO18B-AS1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.26312128).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MYO18B	NM_032608.7 link	c.4226A>T	p.Glu1409Val	missense_variant, splice_region_variant	Exon 25 of 44	ENST00000335473.12	NP_115997.5	Q8IUG5-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
MYO18B	ENST00000335473.12 link	c.4226A>T	p.Glu1409Val	missense_variant, splice_region_variant	Exon 25 of 44	1	NM_032608.7	ENSP00000334563.8	Q8IUG5-1
MYO18B	ENST00000407587.6 link	c.4229A>T	p.Glu1410Val	missense_variant, splice_region_variant	Exon 25 of 44	1		ENSP00000386096.2	Q8IUG5-3
MYO18B	ENST00000536101.5 link	c.4226A>T	p.Glu1409Val	missense_variant, splice_region_variant	Exon 25 of 43	1		ENSP00000441229.1	Q8IUG5-1
MYO18B	ENST00000539302.5 link	n.*1684A>T		splice_region_variant, non_coding_transcript_exon_variant	Exon 23 of 42	1		ENSP00000437587.1	F5H6I8
MYO18B	ENST00000539302.5 link	n.*1684A>T		3_prime_UTR_variant	Exon 23 of 42	1		ENSP00000437587.1	F5H6I8

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152170

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000196

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:

0.00000540

AC:

AN:

185204

Hom.:

AF XY:

0.0000102

AC XY:

AN XY:

98164

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000367

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:

7.05e-7

AC:

AN:

1417716

Hom.:

Cov.:

AF XY:

0.00000143

AC XY:

AN XY:

700850

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000263

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:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000197

AC:

AN:

152170

Hom.:

Cov.:

AF XY:

0.0000404

AC XY:

AN XY:

74334

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.000196

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:

0.0000113

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Oct 13, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces glutamic acid with valine at codon 1409 of the MYO18B protein (p.Glu1409Val). The glutamic acid residue is moderately conserved and there is a moderate physicochemical difference between glutamic acid and valine. 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 variant has not been reported in the literature in individuals affected with MYO18B-related conditions. ClinVar contains an entry for this variant (Variation ID: 1478874). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.13

BayesDel_addAF

Uncertain

0.053

BayesDel_noAF

Benign

-0.16

CADD

Benign

DANN

Uncertain

0.99

DEOGEN2

Benign

0.38

T;T;.

Eigen

Benign

0.15

Eigen_PC

Benign

0.11

FATHMM_MKL

Uncertain

0.79

LIST_S2

Benign

0.73

.;T;T

M_CAP

Uncertain

0.11

MetaRNN

Benign

0.26

T;T;T

MetaSVM

Uncertain

0.39

MutationAssessor

Uncertain

2.7

M;M;.

PrimateAI

Benign

0.35

PROVEAN

Pathogenic

-5.5

D;D;D

REVEL

Uncertain

0.49

Sift

Benign

0.037

D;D;D

Sift4G

Uncertain

0.0070

D;D;D

Polyphen

0.83

P;P;.

Vest4

0.35

MutPred

0.32

.;.;Loss of ubiquitination at K1408 (P = 0.0304);

MVP

0.87

MPC

0.33

ClinPred

0.97

GERP RS

3.0

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.32

gMVP

0.29

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.00014

dbscSNV1_RF

Benign

0.10

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