2-170200244-C-T

Variant names:

• chr2-170200244-C-T
• rs200712982
• NM_138995.5:c.281C>T

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 0P and 2B. BP4_Moderate

The NM_138995.5(MYO3B):​c.281C>T​(p.Ala94Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00018 in 1,613,256 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.00011 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00019 (0 hom.)
• Consequence: MYO3B NM_138995.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.60
• Publications: 5 publications found

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]

ENSG00000308085 (HGNC:):

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.13627338).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MYO3B	NM_138995.5	c.281C>T	p.Ala94Val	missense_variant	Exon 3 of 35	ENST00000408978.9	NP_620482.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MYO3B	ENST00000408978.9	c.281C>T	p.Ala94Val	missense_variant	Exon 3 of 35	1	NM_138995.5	ENSP00000386213.4

Frequencies

GnomAD3 genomes AF: 0.000105 AC: 16 AN: 152166 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000241

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000769

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000162

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.000121 AC: 30 AN: 248498 AF XY: 0.000119

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000502

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000177

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.000188 AC: 275 AN: 1460972 Hom.: 0 Cov.: 30 AF XY: 0.000161 AC XY: 117 AN XY: 726780

African (AFR) AF: 0.0000299 AC: 1 AN: 33392

American (AMR) AF: 0.00 AC: 0 AN: 44622

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26104

East Asian (EAS) AF: 0.000177 AC: 7 AN: 39642

South Asian (SAS) AF: 0.0000116 AC: 1 AN: 86172

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53380

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5758

European-Non Finnish (NFE) AF: 0.000232 AC: 258 AN: 1111560

Other (OTH) AF: 0.000133 AC: 8 AN: 60342

GnomAD4 genome AF: 0.000105 AC: 16 AN: 152284 Hom.: 0 Cov.: 32 AF XY: 0.000134 AC XY: 10 AN XY: 74468

African (AFR) AF: 0.0000241 AC: 1 AN: 41554

American (AMR) AF: 0.00 AC: 0 AN: 15294

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.000771 AC: 4 AN: 5188

South Asian (SAS) AF: 0.00 AC: 0 AN: 4826

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10616

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.000162 AC: 11 AN: 68016

Other (OTH) AF: 0.00 AC: 0 AN: 2112

Alfa AF: 0.000181 Hom.: 0

Bravo AF: 0.000170

TwinsUK AF: 0.00 AC: 0

ALSPAC AF: 0.000259 AC: 1

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000122 AC: 1

ExAC AF: 0.0000497 AC: 6

EpiCase AF: 0.000109

EpiControl AF: 0.0000595

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Aug 16, 2021

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.281C>T (p.A94V) alteration is located in exon 3 (coding exon 3) of the MYO3B gene. This alteration results from a C to T substitution at nucleotide position 281, causing the alanine (A) at amino acid position 94 to be replaced by a valine (V). 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	0.094
BayesDel_addAF	Benign	-0.21	T
BayesDel_noAF	Benign	-0.20
CADD	Benign	20
DANN	Uncertain	1.0
DEOGEN2	Benign	0.017	.;T;T
Eigen	Benign	-0.060
Eigen_PC	Benign	0.13
FATHMM_MKL	Uncertain	0.89	D
LIST_S2	Uncertain	0.88	D;D;D
M_CAP	Benign	0.028	D
MetaRNN	Benign	0.14	T;T;T
MetaSVM	Benign	-0.45	T
MutationAssessor	Benign	1.2	L;L;.
PhyloP100		1.6
PrimateAI	Benign	0.44	T
PROVEAN	Benign	-1.2	N;N;N
REVEL	Benign	0.26
Sift	Benign	0.11	T;T;T
Sift4G	Benign	0.15	.;.;T
Polyphen		0.021	B;B;.
Vest4		0.37
MVP		0.85
MPC		0.077
ClinPred		0.10	T
GERP RS		5.4
Varity_R		0.12
gMVP		0.32
Mutation Taster		=81/19	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.050		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs200712982; hg19: chr2-171056754; COSMIC: COSV58724050;