10-127175905-G-A

Variant summary

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

The NM_001039762.3(INSYN2A):c.491C>T(p.Ala164Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000107 in 1,614,150 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.000079 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00011 (0 hom.)
• Consequence: INSYN2A NM_001039762.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.47

Genes affected

INSYN2A (HGNC:33859): (inhibitory synaptic factor 2A) Predicted to be involved in inhibitory postsynaptic potential. Predicted to be active in postsynaptic density. [provided by Alliance of Genome Resources, Apr 2022]

DOCK1 (HGNC:2987): (dedicator of cytokinesis 1) This gene encodes a member of the dedicator of cytokinesis protein family. Dedicator of cytokinesis proteins act as guanine nucleotide exchange factors for small Rho family G proteins. The encoded protein regulates the small GTPase Rac, thereby influencing several biological processes, including phagocytosis and cell migration. Overexpression of this gene has also been associated with certain cancers. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Mar 2014]

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=0.028990477).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
INSYN2A	NM_001039762.3	c.491C>T	p.Ala164Val	missense_variant	4/6	ENST00000522781.6
DOCK1	NM_001290223.2	c.2847+48141G>A		intron_variant		ENST00000623213.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
INSYN2A	ENST00000522781.6	c.491C>T	p.Ala164Val	missense_variant	4/6	2	NM_001039762.3	P1
DOCK1	ENST00000623213.2	c.2847+48141G>A		intron_variant		1	NM_001290223.2

Frequencies

GnomAD3 genomes AF: 0.0000789 AC: 12 AN: 152148 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000655

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000414

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000132

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.000219 AC: 55 AN: 251460 Hom.: 0 AF XY: 0.000235 AC XY: 32 AN XY: 135916

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000665

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000621

Gnomad FIN exome AF: 0.0000462

Gnomad NFE exome AF: 0.0000703

Gnomad OTH exome AF: 0.000652

GnomAD4 exome AF: 0.000109 AC: 160 AN: 1461884 Hom.: 0 Cov.: 31 AF XY: 0.000113 AC XY: 82 AN XY: 727242

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.000581

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000252

Gnomad4 SAS exome AF: 0.000846

Gnomad4 FIN exome AF: 0.0000187

Gnomad4 NFE exome AF: 0.0000423

Gnomad4 OTH exome AF: 0.000182

GnomAD4 genome AF: 0.0000788 AC: 12 AN: 152266 Hom.: 0 Cov.: 32 AF XY: 0.000107 AC XY: 8 AN XY: 74454

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.0000654

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000415

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000132

Gnomad4 OTH AF: 0.00

Alfa AF: 0.0000564 Hom.: 0

Bravo AF: 0.0000491

ExAC AF: 0.000239 AC: 29

Asia WGS AF: 0.000577 AC: 2 AN: 3478

EpiCase AF: 0.0000545

EpiControl AF: 0.0000593

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

Nov 08, 2022

The c.491C>T (p.A164V) alteration is located in exon 4 (coding exon 1) of the FAM196A gene. This alteration results from a C to T substitution at nucleotide position 491, causing the alanine (A) at amino acid position 164 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	0.091
BayesDel_addAF	Benign	-0.51	T
BayesDel_noAF	Benign	-0.61
Cadd	Benign	14
Dann	Uncertain	0.99
Eigen	Benign	-0.64
Eigen_PC	Benign	-0.72
FATHMM_MKL	Benign	0.56	D
LIST_S2	Benign	0.70	T;T;.
M_CAP	Benign	0.0053	T
MetaRNN	Benign	0.029	T;T;T
MetaSVM	Benign	-0.95	T
MutationTaster	Benign	1.0	D;N;N
PrimateAI	Benign	0.36	T
Sift4G	Benign	0.10	T;T;T
Polyphen		0.054	.;B;.
Vest4		0.25
MutPred		0.29		Gain of relative solvent accessibility (P = 0.0023);Gain of relative solvent accessibility (P = 0.0023);Gain of relative solvent accessibility (P = 0.0023);
MVP		0.068
MPC		0.14
ClinPred		0.044	T
GERP RS		2.0
Varity_R		0.033
gMVP		0.12

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: rs551807342; hg19: chr10-128974169; COSMIC: COSV54732908;