chr15-74410724-C-T

Position:

• chr15-74410724-C-T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_003612.5(SEMA7A):​c.1901G>A​(p.Gly634Asp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: SEMA7A NM_003612.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.08

Genes affected

SEMA7A (HGNC:10741): (semaphorin 7A (JohnMiltonHagen blood group)) This gene encodes a member of the semaphorin family of proteins. The encoded preproprotein is proteolytically processed to generate the mature glycosylphosphatidylinositol (GPI)-anchored membrane glycoprotein. The encoded protein is found on activated lymphocytes and erythrocytes and may be involved in immunomodulatory and neuronal processes. The encoded protein carries the John Milton Hagen (JMH) blood group antigens. Mutations in this gene may be associated with reduced bone mineral density (BMD). Alternative splicing results in multiple transcript variants, at least one of which encodes an isoform that is proteolytically processed. [provided by RefSeq, Feb 2016]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.061912775).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SEMA7A	NM_003612.5	c.1901G>A	p.Gly634Asp	missense_variant	14/14	ENST00000261918.9
SEMA7A	NM_001146029.3	c.1859G>A	p.Gly620Asp	missense_variant	13/13
SEMA7A	NM_001146030.3	c.1406G>A	p.Gly469Asp	missense_variant	14/14
SEMA7A	XM_047433177.1	c.1778G>A	p.Gly593Asp	missense_variant	14/14

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SEMA7A	ENST00000261918.9	c.1901G>A	p.Gly634Asp	missense_variant	14/14	1	NM_003612.5	P1
SEMA7A	ENST00000543145.6	c.1859G>A	p.Gly620Asp	missense_variant	13/13	2
SEMA7A	ENST00000542748.6	c.1406G>A	p.Gly469Asp	missense_variant	14/14	5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

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 19, 2023

The c.1901G>A (p.G634D) alteration is located in exon 14 (coding exon 14) of the SEMA7A gene. This alteration results from a G to A substitution at nucleotide position 1901, causing the glycine (G) at amino acid position 634 to be replaced by an aspartic acid (D). 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	0.081
BayesDel_addAF	Benign	-0.26	T
BayesDel_noAF	Benign	-0.61
CADD	Benign	8.8
DANN	Benign	0.12
DEOGEN2	Benign	0.11	T;T;.
Eigen	Benign	-1.2
Eigen_PC	Benign	-1.2
FATHMM_MKL	Benign	0.14	N
LIST_S2	Benign	0.60	T;T;T
M_CAP	Benign	0.0051	T
MetaRNN	Benign	0.062	T;T;T
MetaSVM	Benign	-0.97	T
MutationAssessor	Benign	0.55	N;.;.
MutationTaster	Benign	1.0	N;N;N
PrimateAI	Benign	0.26	T
PROVEAN	Benign	-0.58	N;N;N
REVEL	Benign	0.024
Sift	Benign	0.45	T;T;T
Sift4G	Benign	0.32	T;T;T
Polyphen		0.0020	B;.;.
Vest4		0.097
MutPred		0.49		Loss of sheet (P = 0.1158);.;.;
MVP		0.53
MPC		0.62
ClinPred		0.012	T
GERP RS		1.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.035
gMVP		0.65

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: rs2060891788; hg19: chr15-74703065;