rs1555875920

chr22-23791855-G-Achr22-23791855-G-Cchr22-23791855-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 5P and 1B. PM1 PM2 PP2 BP4

The NM_003073.5(SMARCB1):c.193G>A(p.Ala65Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A65S) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: SMARCB1 NM_003073.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 9.70

Genes affected

SMARCB1 (HGNC:11103): (SWI/SNF related, matrix associated, actin dependent regulator of chromatin, subfamily b, member 1) The protein encoded by this gene is part of a complex that relieves repressive chromatin structures, allowing the transcriptional machinery to access its targets more effectively. The encoded nuclear protein may also bind to and enhance the DNA joining activity of HIV-1 integrase. This gene has been found to be a tumor suppressor, and mutations in it have been associated with malignant rhabdoid tumors. Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Dec 2015]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM1: In a region_of_interest DNA-binding (size 112) in uniprot entity SNF5_HUMAN there are 13 pathogenic changes around while only 2 benign (87%) in NM_003073.5
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, SMARCB1
• BP4: Computational evidence support a benign effect (MetaRNN=0.36408967).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SMARCB1	NM_003073.5	c.193G>A	p.Ala65Thr	missense_variant	2/9	ENST00000644036.2
SMARCB1	NM_001362877.2	c.193G>A	p.Ala65Thr	missense_variant	2/9
SMARCB1	NM_001317946.2	c.193G>A	p.Ala65Thr	missense_variant	2/9
SMARCB1	NM_001007468.3	c.193G>A	p.Ala65Thr	missense_variant	2/9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SMARCB1	ENST00000644036.2	c.193G>A	p.Ala65Thr	missense_variant	2/9		NM_003073.5	A1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.098
BayesDel_addAF	Pathogenic	0.21	D
BayesDel_noAF	Uncertain	0.070
Cadd	Uncertain	25
Dann	Uncertain	0.99
Eigen	Uncertain	0.34
Eigen_PC	Uncertain	0.51
FATHMM_MKL	Pathogenic	0.99	D
M_CAP	Uncertain	0.10	D
MetaRNN	Benign	0.36	T;T;T;T;T;T
MetaSVM	Uncertain	0.55	D
MutationAssessor	Benign	0.90	L;L;.;.;.;.
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Uncertain	0.68	T
PROVEAN	Benign	-0.44	N;.;N;N;N;N
REVEL	Uncertain	0.42
Sift	Benign	0.46	T;.;T;T;T;T
Sift4G	Benign	0.45	T;.;T;T;T;T
Polyphen		0.010, 0.017, 0.61	.;B;B;.;.;P
Vest4		0.28
MutPred		0.16		Gain of glycosylation at A65 (P = 0.0279);Gain of glycosylation at A65 (P = 0.0279);Gain of glycosylation at A65 (P = 0.0279);Gain of glycosylation at A65 (P = 0.0279);Gain of glycosylation at A65 (P = 0.0279);Gain of glycosylation at A65 (P = 0.0279);
MVP		0.75
MPC		1.3
ClinPred		0.83	D
GERP RS		5.6
Varity_R		0.32
gMVP		0.51

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.050		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr22-24134042;