3-122912201-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_001031702.4(SEMA5B):c.2867A>G(p.Glu956Gly) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: SEMA5B NM_001031702.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 8.00

Genes affected

SEMA5B (HGNC:10737): (semaphorin 5B) This gene encodes a member of the semaphorin protein family which regulates axon growth during development of the nervous system. The encoded protein has a characteristic Sema domain near the N-terminus, through which semaphorins bind to plexin, and five thrombospondin type 1 repeats in the C-terminal region of the protein. The protein product may be cleaved and exist as a secreted molecule (PMID: 19463192). Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jan 2012]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.781

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SEMA5B	NM_001031702.4	c.2867A>G	p.Glu956Gly	missense_variant	19/23	ENST00000357599.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SEMA5B	ENST00000357599.8	c.2867A>G	p.Glu956Gly	missense_variant	19/23	1	NM_001031702.4

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

Bravo AF: 0.0000189

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

Dec 03, 2021

The c.2867A>G (p.E956G) alteration is located in exon 19 (coding exon 18) of the SEMA5B gene. This alteration results from a A to G substitution at nucleotide position 2867, causing the glutamic acid (E) at amino acid position 956 to be replaced by a glycine (G). 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	Pathogenic	0.92
BayesDel_addAF	Pathogenic	0.18	D
BayesDel_noAF	Uncertain	0.020
CADD	Pathogenic	34
DANN	Pathogenic	1.0
Eigen	Uncertain	0.60
Eigen_PC	Uncertain	0.59
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.89	D;D;D;D;.;D;D
M_CAP	Uncertain	0.12	D
MetaRNN	Pathogenic	0.78	D;D;D;D;D;D;D
MetaSVM	Benign	-0.68	T
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Uncertain	0.71	T
Polyphen		0.97	.;.;D;.;D;.;.
Vest4		0.82, 0.76, 0.59, 0.79
MutPred		0.59		.;.;Gain of glycosylation at T954 (P = 0.0491);.;Gain of glycosylation at T954 (P = 0.0491);.;Gain of glycosylation at T954 (P = 0.0491);
MVP		0.88
MPC		0.76
ClinPred		1.0	D
GERP RS		4.5
Varity_R		0.48
gMVP		0.59

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.34		Details are displayed if max score is > 0.2
DS_DL_spliceai		0.34		Position offset: -29

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

Publications

LitVar

Other links and lift over

dbSNP: rs1023882353; hg19: chr3-122631048;