22-39374425-A-G

Variant names:

• chr22-39374425-A-G
• rs753637119
• NM_004711.5:c.209A>G

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_004711.5(SYNGR1):​c.209A>G​(p.Tyr70Cys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000867 in 1,613,894 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic 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. Y70S) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.000033 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0000062 (0 hom.)
• Consequence: SYNGR1 NM_004711.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.30

Genes affected

SYNGR1 (HGNC:11498): (synaptogyrin 1) This gene encodes an integral membrane protein associated with presynaptic vesicles in neuronal cells. The exact function of this protein is unclear, but studies of a similar murine protein suggest that it functions in synaptic plasticity without being required for synaptic transmission. The gene product belongs to the synaptogyrin gene family. Three alternatively spliced variants encoding three different isoforms have been identified. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.963

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SYNGR1	NM_004711.5	c.209A>G	p.Tyr70Cys	missense_variant	Exon 2 of 4	ENST00000328933.10	NP_004702.2
SYNGR1	NM_145738.3	c.212A>G	p.Tyr71Cys	missense_variant	Exon 2 of 4		NP_663791.1
SYNGR1	NM_145731.4	c.209A>G	p.Tyr70Cys	missense_variant	Exon 2 of 4		NP_663783.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SYNGR1	ENST00000328933.10	c.209A>G	p.Tyr70Cys	missense_variant	Exon 2 of 4	1	NM_004711.5	ENSP00000332287.5

Frequencies

GnomAD3 genomes AF: 0.0000329 AC: 5 AN: 152190 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000724

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000655

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.0000199 AC: 5 AN: 251176 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 135856

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000145

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000616 AC: 9 AN: 1461704 Hom.: 0 Cov.: 32 AF XY: 0.00000275 AC XY: 2 AN XY: 727166

Gnomad4 AFR exome AF: 0.0000597

Gnomad4 AMR exome AF: 0.000112

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: 0.00000180

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.0000329 AC: 5 AN: 152190 Hom.: 0 Cov.: 32 AF XY: 0.0000269 AC XY: 2 AN XY: 74344

Gnomad4 AFR AF: 0.0000724

Gnomad4 AMR AF: 0.0000655

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000147

Gnomad4 OTH AF: 0.00

Bravo AF: 0.0000453

ExAC AF: 0.0000165 AC: 2

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

Nov 13, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.209A>G (p.Y70C) alteration is located in exon 2 (coding exon 2) of the SYNGR1 gene. This alteration results from a A to G substitution at nucleotide position 209, causing the tyrosine (Y) at amino acid position 70 to be replaced by a cysteine (C). 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	0.60
BayesDel_addAF	Benign	-0.043	T
BayesDel_noAF	Uncertain	-0.040
CADD	Pathogenic	30
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.64	.;.;.;D;.
Eigen	Pathogenic	0.68
Eigen_PC	Uncertain	0.59
FATHMM_MKL	Uncertain	0.90	D
LIST_S2	Uncertain	0.95	D;D;D;D;D
M_CAP	Uncertain	0.11	D
MetaRNN	Pathogenic	0.96	D;D;D;D;D
MetaSVM	Benign	-0.59	T
MutationAssessor	Uncertain	2.8	M;.;.;M;.
PROVEAN	Pathogenic	-8.0	D;D;D;D;D
REVEL	Uncertain	0.55
Sift	Pathogenic	0.0	D;D;D;D;D
Sift4G	Pathogenic	0.0010	D;D;D;D;D
Polyphen		1.0	D;.;.;D;D
Vest4		0.94
MutPred		0.89		Gain of glycosylation at S69 (P = 0.1161);Gain of glycosylation at S69 (P = 0.1161);Gain of glycosylation at S69 (P = 0.1161);Gain of glycosylation at S69 (P = 0.1161);.;
MVP		0.36
MPC		1.1
ClinPred		0.99	D
GERP RS		3.9
Varity_R		0.90
gMVP		0.96

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: rs753637119; hg19: chr22-39770430;