2-170200248-T-A

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_138995.5(MYO3B):c.285T>A(p.Asp95Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000411 in 1,461,048 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict 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. D95H) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000041 (0 hom.)
• Consequence: MYO3B NM_138995.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.14

Genes affected

MYO3B (HGNC:15576): (myosin IIIB) This gene encodes one of the class III myosins. Myosins are ATPases, activated by actin, that move along actin filaments in the cell. This class of myosins are characterized by an amino-terminal kinase domain and shown to be present in photoreceptors. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Mar 2014]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.32624578).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYO3B	NM_138995.5	c.285T>A	p.Asp95Glu	missense_variant	3/35	ENST00000408978.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MYO3B	ENST00000408978.9	c.285T>A	p.Asp95Glu	missense_variant	3/35	1	NM_138995.5	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000411 AC: 6 AN: 1461048 Hom.: 0 Cov.: 30 AF XY: 0.00000138 AC XY: 1 AN XY: 726850

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: 0.00000540

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

Alfa AF: 0.0000468 Hom.: 0

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jun 06, 2023

The c.285T>A (p.D95E) alteration is located in exon 3 (coding exon 3) of the MYO3B gene. This alteration results from a T to A substitution at nucleotide position 285, causing the aspartic acid (D) at amino acid position 95 to be replaced by a glutamic acid (E). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.27
BayesDel_addAF	Uncertain	0.10	D
BayesDel_noAF	Benign	-0.090
Cadd	Benign	22
Dann	Uncertain	0.99
Eigen	Benign	-0.20
Eigen_PC	Benign	-0.11
FATHMM_MKL	Uncertain	0.91	D
LIST_S2	Benign	0.82	T;T;T
M_CAP	Benign	0.044	D
MetaRNN	Benign	0.33	T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.96	L;L;.
MutationTaster	Benign	0.88	D;D;D
PrimateAI	Uncertain	0.58	T
PROVEAN	Benign	-1.9	N;N;N
REVEL	Uncertain	0.51
Sift	Benign	0.13	T;T;T
Polyphen		0.98	D;D;.
Vest4		0.79
MutPred		0.46		Gain of methylation at K93 (P = 0.0828);Gain of methylation at K93 (P = 0.0828);.;
MVP		0.83
MPC		0.32
ClinPred		0.84	D
GERP RS		1.1
Varity_R		0.16
gMVP		0.41

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

Other links and lift over

dbSNP: rs2092646176; hg19: chr2-171056758;