Genetic Variant MYO18B:p.Arg1353Pro (chr22-25874392-G-C) – ACMG Classification: Uncertain_significance (4 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2PP3_Moderate

The NM_032608.7(MYO18B):c.4058G>C(p.Arg1353Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,568 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R1353C) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

MYO18B
NM_032608.7 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 7.54

Publications

0 publications found

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 Gene-Disease associations (from GenCC):

Klippel-Feil anomaly-myopathy-facial dysmorphism syndrome
Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet, Ambry Genetics, ClinGen, G2P

MYO18B links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.933

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_032608.7. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MYO18B	NM_032608.7	MANE Select	c.4058G>C	p.Arg1353Pro	missense	Exon 23 of 44	NP_115997.5
	MYO18B	NM_001318245.2		c.4061G>C	p.Arg1354Pro	missense	Exon 23 of 44	NP_001305174.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
MYO18B	ENST00000335473.12	TSL:1 MANE Select	c.4058G>C	p.Arg1353Pro	missense	Exon 23 of 44	ENSP00000334563.8
MYO18B	ENST00000407587.6	TSL:1	c.4061G>C	p.Arg1354Pro	missense	Exon 23 of 44	ENSP00000386096.2
MYO18B	ENST00000536101.5	TSL:1	c.4058G>C	p.Arg1353Pro	missense	Exon 23 of 43	ENSP00000441229.1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461568

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

727052

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33478

American (AMR)

AF:

0.00

AC:

AN:

44706

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26130

East Asian (EAS)

AF:

0.00

AC:

AN:

39696

South Asian (SAS)

AF:

0.00

AC:

AN:

86246

European-Finnish (FIN)

AF:

0.0000187

AC:

AN:

53394

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1111778

Other (OTH)

AF:

0.00

AC:

AN:

60372

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.575

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.96

BayesDel_addAF

Pathogenic

0.34

BayesDel_noAF

Pathogenic

0.26

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.68

Eigen

Pathogenic

0.98

Eigen_PC

Pathogenic

0.91

FATHMM_MKL

Pathogenic

0.97

LIST_S2

Benign

0.83

M_CAP

Uncertain

0.12

MetaRNN

Pathogenic

0.93

MetaSVM

Uncertain

0.66

MutationAssessor

Pathogenic

3.0

PhyloP100

7.5

PrimateAI

Uncertain

0.57

PROVEAN

Pathogenic

-6.8

REVEL

Pathogenic

0.90

Sift

Uncertain

0.0010

Sift4G

Uncertain

0.012

Polyphen

1.0

Vest4

0.91

MutPred

0.73

Loss of MoRF binding (P = 0.001)

MVP

0.97

MPC

0.47

ClinPred

1.0

GERP RS

5.5

Varity_R

0.95

gMVP

0.85

Mutation Taster

=34/66

disease causing

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over