chr22-23833655-C-T

Variant names:

• chr22-23833655-C-T
• rs1555881567
• NM_003073.5:c.1070C>T

Variant summary

Our verdict is Pathogenic. The variant received 16 ACMG points: 16P and 0B. PM1 PM2 PM5 PP3_Moderate PP5_Very_Strong

The NM_003073.5(SMARCB1):​c.1070C>T​(p.Thr357Ile) 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 pathogenic outcome for this variant. 13/22 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T357R) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 33)
• Consequence: SMARCB1 NM_003073.5 missense
• Clinical Significance: Likely pathogenic criteria provided, multiple submitters, no conflicts P:2
• Conservation: PhyloP100: 7.66
• 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: ClinGen, Orphanet
• intellectual disability, autosomal dominant 15

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

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), ClinGen, Ambry Genetics, Genomics England PanelApp, G2P
• 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: Pathogenic. The variant received 16 ACMG points.

• PM1: In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 8 uncertain in NM_003073.5
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr22-23833655-C-G is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 559897.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.935
• PP5: Variant 22-23833655-C-T is Pathogenic according to our data. Variant chr22-23833655-C-T is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 580796.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

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

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SMARCB1	NM_003073.5	MANE Select	c.1070C>T	p.Thr357Ile	missense	Exon 8 of 9	NP_003064.2
	SMARCB1	NM_001362877.2		c.1124C>T	p.Thr375Ile	missense	Exon 8 of 9	NP_001349806.1
	SMARCB1	NM_001317946.2		c.1097C>T	p.Thr366Ile	missense	Exon 8 of 9	NP_001304875.1	G5E975

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SMARCB1	ENST00000644036.2	MANE Select	c.1070C>T	p.Thr357Ile	missense	Exon 8 of 9	ENSP00000494049.2	Q12824-1
	SMARCB1	ENST00000407422.8	TSL:1	c.1043C>T	p.Thr348Ile	missense	Exon 8 of 9	ENSP00000383984.3	Q12824-2
	SMARCB1	ENST00000263121.12	TSL:1	c.932C>T	p.Thr311Ile	missense	Exon 7 of 8	ENSP00000263121.8	A0A0G2JRV3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

ClinVar submissions

Significance: Likely pathogenic

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
2	-	-	not provided (2)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.30	D
BayesDel_noAF	Pathogenic	0.20
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.90	D
Eigen	Pathogenic	0.74
Eigen_PC	Uncertain	0.61
FATHMM_MKL	Uncertain	0.92	D
M_CAP	Pathogenic	0.57	D
MetaRNN	Pathogenic	0.94	D
MetaSVM	Uncertain	0.70	D
MutationAssessor	Pathogenic	3.5	M
PhyloP100		7.7
PrimateAI	Pathogenic	0.94	D
PROVEAN	Pathogenic	-4.8	D
REVEL	Pathogenic	0.82
Sift	Uncertain	0.0020	D
Sift4G	Uncertain	0.0020	D
Polyphen		1.0	D
Vest4		0.84
MutPred		0.72		Loss of disorder (P = 0.0376)
MVP		0.89
MPC		2.6
ClinPred		0.99	D
GERP RS		4.8
Varity_R		0.90
gMVP		0.99
Mutation Taster		=7/93	disease causing (ClinVar)

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: rs1555881567; hg19: chr22-24175842;