rs1060503017

Positions:

• chr22-23825397-AGAAGACCT-A

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_003073.5(SMARCB1):​c.969_976del​(p.Lys324ArgfsTer34) variant causes a frameshift change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 33)
• Consequence: SMARCB1 NM_003073.5 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 9.94

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 Pathogenic. Variant got 12 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 22-23825397-AGAAGACCT-A is Pathogenic according to our data. Variant chr22-23825397-AGAAGACCT-A is described in ClinVar as [Pathogenic]. Clinvar id is 410704.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SMARCB1	NM_003073.5	c.969_976del	p.Lys324ArgfsTer34	frameshift_variant	7/9	ENST00000644036.2	NP_003064.2
SMARCB1	NM_001007468.3	c.942_949del	p.Lys315ArgfsTer34	frameshift_variant	7/9		NP_001007469.1
SMARCB1	NM_001317946.2	c.996_1003del	p.Lys333ArgfsTer34	frameshift_variant	7/9		NP_001304875.1
SMARCB1	NM_001362877.2	c.1023_1030del	p.Lys342ArgfsTer34	frameshift_variant	7/9		NP_001349806.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SMARCB1	ENST00000644036.2	c.969_976del	p.Lys324ArgfsTer34	frameshift_variant	7/9		NM_003073.5	ENSP00000494049	A1

Frequencies

GnomAD3 genomes Cov.: 33

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 13, 2016

For these reasons, this variant has been classified as Pathogenic. While this particular variant has not been reported in the literature, loss-of-function variants in SMARCB1 are known to be pathogenic (PMID: 10521299, 21208904). This sequence change deletes 8 nucleotides from exon 7 of the SMARCB1 mRNA (c.969_976del), causing a frameshift at codon 324. This creates a premature translational stop signal (p.Lys324Argfs*34) and is expected to result in an absent or disrupted protein product. -

Computational scores

Source: dbNSFP v4.3

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs1060503017; hg19: chr22-24167584;