22-23816896-G-C

Variant names:

• chr22-23816896-G-C
• rs372924301
• NM_003073.5:c.755G>C

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_003073.5(SMARCB1):​c.755G>C​(p.Ser252Thr) 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. 13/22 in silico tools predict 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. S252N) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: SMARCB1 NM_003073.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 6.70
• Publications: 0 publications found

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]

SMARCB1 Gene-Disease associations (from GenCC):

• Coffin-Siris syndrome

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, ClinGen
• intellectual disability, autosomal dominant 15

  Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE Submitted by: G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae)
• rhabdoid tumor predisposition syndrome 1

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, Genomics England PanelApp, Ambry Genetics, Labcorp Genetics (formerly Invitae), ClinGen
• SMARCB1-related schwannomatosis

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, Ambry Genetics
• familial multiple meningioma

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• familial rhabdoid tumor

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• schwannomatosis

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• complex neurodevelopmental disorder

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.26219583).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_003073.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SMARCB1	NM_003073.5	MANE Select	c.755G>C	p.Ser252Thr	missense	Exon 6 of 9	NP_003064.2
	SMARCB1	NM_001362877.2		c.809G>C	p.Ser270Thr	missense	Exon 6 of 9	NP_001349806.1
	SMARCB1	NM_001317946.2		c.782G>C	p.Ser261Thr	missense	Exon 6 of 9	NP_001304875.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SMARCB1	ENST00000644036.2	MANE Select	c.755G>C	p.Ser252Thr	missense	Exon 6 of 9	ENSP00000494049.2
	SMARCB1	ENST00000407422.8	TSL:1	c.728G>C	p.Ser243Thr	missense	Exon 6 of 9	ENSP00000383984.3
	SMARCB1	ENST00000263121.12	TSL:1	c.617G>C	p.Ser206Thr	missense	Exon 5 of 8	ENSP00000263121.8

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.069
BayesDel_addAF	Uncertain	0.024	T
BayesDel_noAF	Benign	-0.20
CADD	Uncertain	23
DANN	Benign	0.79
DEOGEN2	Benign	0.29	T
Eigen	Benign	-0.29
Eigen_PC	Benign	0.0073
FATHMM_MKL	Uncertain	0.93	D
M_CAP	Benign	0.019	T
MetaRNN	Benign	0.26	T
MetaSVM	Benign	-0.86	T
MutationAssessor	Benign	1.2	L
PhyloP100		6.7
PrimateAI	Uncertain	0.78	T
PROVEAN	Benign	-0.50	N
REVEL	Benign	0.29
Sift	Benign	0.68	T
Sift4G	Benign	0.71	T
Polyphen		0.0	B
Vest4		0.45
MutPred		0.34		Loss of disorder (P = 0.0714)
MVP		0.73
MPC		1.2
ClinPred		0.63	D
GERP RS		5.2
Varity_R		0.51
gMVP		0.62
Mutation Taster		=71/29	polymorphism

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

Other links and lift over

dbSNP: rs372924301; hg19: chr22-24159083;