Genetic Variant MYO15B:c.2651+2T>A (chr17-75592082-T-A) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_001395058.1(MYO15B):c.2651+2T>A variant causes a splice donor, intron change. The variant allele was found at a frequency of 0.00000427 in 702,702 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 1/1 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000036 ( 0 hom. )

Consequence

MYO15B
NM_001395058.1 splice_donor, intron

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 3.74

Variant links:

Genes affected

MYO15B (HGNC:14083): (myosin XVB) Predicted to enable ATP binding activity; actin binding activity; and cytoskeletal motor activity. Predicted to be located in brush border; cytoplasm; and cytoskeleton. Predicted to be part of myosin complex. [provided by Alliance of Genome Resources, Apr 2022]

MYO15B links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MYO15B	NM_001395058.1 link	c.2651+2T>A		splice_donor_variant, intron_variant	Intron 6 of 63	ENST00000645453.3	NP_001381987.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MYO15B	ENST00000645453.3 link	c.2651+2T>A		splice_donor_variant, intron_variant	Intron 6 of 63		NM_001395058.1	ENSP00000495242.3		A0A2R8YFM0

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152174

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.00000363

AC:

AN:

550528

Hom.:

Cov.:

AF XY:

0.00000336

AC XY:

AN XY:

298042

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

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:

0.00000631

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152174

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74338

show subpopulations

Gnomad4 AFR

AF:

0.0000241

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:

0.00

Gnomad4 OTH

AF:

0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Congenital myopathy

Uncertain:1

Dec 20, 2023

Broad Center for Mendelian Genomics, Broad Institute of MIT and Harvard

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: curation

The heterozygous c.2651+2T>A variant in MYO15B was identified by our study in 1 individual with dysphagia, ptosis, increased muscle fatigability, and muscle weakness. This variant was detected in cis with another variant of uncertain significance (p.Asp2703Glu) in MYO15B. While this gene is still lacking sufficient evidence to establish a gene-disease relationship, we believe this is a possible novel gene candidate for this phenotype. Given the limited information about this gene-disease relationship, the significance of the c.2651+2T>A variant is uncertain. If you have any additional information about functional evidence or other individuals with this phenotype that also have variants in MYO15B we encourage you to reach out to us. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Pathogenic

0.31

CADD

Uncertain

DANN

Uncertain

0.99

FATHMM_MKL

Pathogenic

0.98

GERP RS

4.3

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.99

Details are displayed if max score is > 0.2

DS_DG_spliceai

0.30

Position offset: -25

DS_DL_spliceai

0.99

Position offset: -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