3-136338270-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 3P and 2B. PM2 PP2 BP4_Moderate

The NM_005862.3(STAG1):c.3761G>C(p.Gly1254Ala) 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. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: STAG1 NM_005862.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.35

Genes affected

STAG1 (HGNC:11354): (STAG1 cohesin complex component) This gene is a member of the SCC3 family and is expressed in the nucleus. It encodes a component of cohesin, a multisubunit protein complex that provides sister chromatid cohesion along the length of a chromosome from DNA replication through prophase and prometaphase, after which it is dissociated in preparation for segregation during anaphase. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, STAG1
• BP4: Computational evidence support a benign effect (MetaRNN=0.17536268).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
STAG1	NM_005862.3	c.3761G>C	p.Gly1254Ala	missense_variant	34/34	ENST00000383202.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
STAG1	ENST00000383202.7	c.3761G>C	p.Gly1254Ala	missense_variant	34/34	1	NM_005862.3	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 27

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Dec 13, 2023

This sequence change replaces glycine, which is neutral and non-polar, with alanine, which is neutral and non-polar, at codon 1254 of the STAG1 protein (p.Gly1254Ala). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with STAG1-related conditions. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt STAG1 protein function with a negative predictive value of 95%. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.13
BayesDel_addAF	Benign	-0.091	T
BayesDel_noAF	Benign	-0.37
Cadd	Benign	23
Dann	Uncertain	0.98
DEOGEN2	Benign	0.048	T;.;T
Eigen	Uncertain	0.21
Eigen_PC	Uncertain	0.36
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.96	D;D;D
M_CAP	Benign	0.0093	T
MetaRNN	Benign	0.18	T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.34	N;.;.
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Uncertain	0.71	T
PROVEAN	Benign	-1.4	N;N;N
REVEL	Benign	0.089
Sift	Uncertain	0.0060	D;D;D
Sift4G	Benign	0.066	T;T;T
Polyphen		0.17	B;.;.
Vest4		0.40
MutPred		0.20		Gain of catalytic residue at G1254 (P = 0.0998);.;.;
MVP		0.14
MPC		0.92
ClinPred		0.59	D
GERP RS		5.8
Varity_R		0.20
gMVP		0.44

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.17		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: rs1935782463; hg19: chr3-136057112;