8-50450579-A-G

Position:

• chr8-50450579-A-G

Variant summary

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

The NM_018967.5(SNTG1):​c.301A>G​(p.Ile101Val) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: SNTG1 NM_018967.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 6.14

Genes affected

SNTG1 (HGNC:13740): (syntrophin gamma 1) The protein encoded by this gene is a member of the syntrophin family. Syntrophins are cytoplasmic peripheral membrane proteins that typically contain 2 pleckstrin homology (PH) domains, a PDZ domain that bisects the first PH domain, and a C-terminal domain that mediates dystrophin binding. This family member plays a role in mediating gamma-enolase trafficking to the plasma membrane and in enhancing its neurotrophic activity. Mutations in this gene are associated with idiopathic scoliosis. Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Mar 2016]

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=0.27381682).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SNTG1	NM_018967.5	c.301A>G	p.Ile101Val	missense_variant	7/19	ENST00000642720.2	NP_061840.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SNTG1	ENST00000642720.2	c.301A>G	p.Ile101Val	missense_variant	7/19		NM_018967.5	ENSP00000493900	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

Alfa AF: 0.0000312 Hom.: 0

Bravo AF: 0.00000378

EpiCase AF: 0.0000545

EpiControl AF: 0.00

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 27, 2023

The c.301A>G (p.I101V) alteration is located in exon 7 (coding exon 5) of the SNTG1 gene. This alteration results from a A to G substitution at nucleotide position 301, causing the isoleucine (I) at amino acid position 101 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	0.095
BayesDel_addAF	Benign	-0.039	T
BayesDel_noAF	Benign	-0.29
CADD	Benign	19
DANN	Benign	0.58
DEOGEN2	Benign	0.0063	T;T;.;.;.;T;.;.;.;.;.
Eigen	Benign	-0.13
Eigen_PC	Benign	0.049
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Benign	0.83	.;.;T;D;D;D;D;D;D;D;D
M_CAP	Benign	0.0021	T
MetaRNN	Benign	0.27	T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	-0.88	N;N;.;.;.;N;.;N;.;.;.
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Uncertain	0.76	T
PROVEAN	Benign	0.090	N;.;.;.;.;N;.;N;.;.;.
REVEL	Benign	0.24
Sift	Benign	1.0	T;.;.;.;.;T;.;T;.;.;.
Sift4G	Benign	1.0	T;.;.;.;.;T;.;T;.;.;.
Polyphen		0.70	P;P;.;.;.;P;.;B;.;.;.
Vest4		0.58
MutPred		0.53		Loss of sheet (P = 0.1158);Loss of sheet (P = 0.1158);.;Loss of sheet (P = 0.1158);.;Loss of sheet (P = 0.1158);Loss of sheet (P = 0.1158);Loss of sheet (P = 0.1158);Loss of sheet (P = 0.1158);Loss of sheet (P = 0.1158);Loss of sheet (P = 0.1158);
MVP		0.51
MPC		0.072
ClinPred		0.41	T
GERP RS		5.3
Varity_R		0.092
gMVP		0.12

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs1413479636; hg19: chr8-51363139;