22-25878007-C-T

Position:

chr22-25878007-C-T

Variant summary

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

The ENST00000335473.12(MYO18B):c.4273C>T(p.Arg1425Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000417 in 1,584,572 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 (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R1425Q) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000099 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000036 ( 0 hom. )

Consequence

MYO18B
ENST00000335473.12 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 0.445

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=0.20426586).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MYO18B	NM_032608.7 linkuse as main transcript	c.4273C>T	p.Arg1425Trp	missense_variant	25/44	ENST00000335473.12	NP_115997.5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MYO18B	ENST00000335473.12 linkuse as main transcript	c.4273C>T	p.Arg1425Trp	missense_variant	25/44	1	NM_032608.7	ENSP00000334563	A2	Q8IUG5-1
MYO18B-AS1	ENST00000453457.7 linkuse as main transcript	n.1128-706G>A		intron_variant, non_coding_transcript_variant		5

Frequencies

GnomAD3 genomes

AF:

0.0000986

AC:

AN:

152132

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000169

Gnomad AMI

AF:

0.00329

Gnomad AMR

AF:

0.00

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:

0.0000735

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000293

AC:

AN:

204942

Hom.:

AF XY:

0.0000183

AC XY:

AN XY:

109502

show subpopulations

Gnomad AFR exome

AF:

0.0000830

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.000109

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0000521

Gnomad NFE exome

AF:

0.0000335

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000356

AC:

AN:

1432440

Hom.:

Cov.:

AF XY:

0.0000395

AC XY:

AN XY:

709476

show subpopulations

Gnomad4 AFR exome

AF:

0.0000912

Gnomad4 AMR exome

AF:

0.0000246

Gnomad4 ASJ exome

AF:

0.0000392

Gnomad4 EAS exome

AF:

0.000183

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.0000194

Gnomad4 NFE exome

AF:

0.0000310

Gnomad4 OTH exome

AF:

0.0000673

GnomAD4 genome

AF:

0.0000986

AC:

AN:

152132

Hom.:

Cov.:

AF XY:

0.0000807

AC XY:

AN XY:

74332

show subpopulations

Gnomad4 AFR

AF:

0.000169

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000735

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000554

Hom.:

Bravo

AF:

0.000147

TwinsUK

AF:

0.00

AC:

ALSPAC

AF:

0.000259

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000122

AC:

ExAC

AF:

0.0000665

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Apr 19, 2023

The c.4273C>T (p.R1425W) alteration is located in exon 25 (coding exon 24) of the MYO18B gene. This alteration results from a C to T substitution at nucleotide position 4273, causing the arginine (R) at amino acid position 1425 to be replaced by a tryptophan (W). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jul 19, 2022

This sequence change replaces arginine, which is basic and polar, with tryptophan, which is neutral and slightly polar, at codon 1425 of the MYO18B protein (p.Arg1425Trp). 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: 1376648). 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: "Not Available"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Not Available"). 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

0.15

BayesDel_addAF

Pathogenic

0.18

BayesDel_noAF

Uncertain

0.030

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.45

T;T;.

Eigen

Benign

0.025

Eigen_PC

Benign

-0.24

FATHMM_MKL

Benign

0.085

LIST_S2

Uncertain

0.97

.;D;D

M_CAP

Benign

0.064

MetaRNN

Benign

0.20

T;T;T

MetaSVM

Pathogenic

0.96

MutationAssessor

Pathogenic

3.8

H;H;.

MutationTaster

Benign

0.77

D;D;D

PrimateAI

Benign

0.47

PROVEAN

Pathogenic

-7.2

D;D;D

REVEL

Uncertain

0.55

Sift

Uncertain

0.0010

D;D;D

Sift4G

Pathogenic

0.0010

D;D;D

Polyphen

1.0

D;D;.

Vest4

0.35

MVP

0.94

MPC

0.40

ClinPred

0.98

GERP RS

1.8

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.63

gMVP

0.56

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