rs281875184

Positions:

• chr9-2115840-C-G

Variant summary

Our verdict is Pathogenic. Variant got 13 ACMG points: 13P and 0B. PM1 PM2 PM5 PP2 PP3_Strong PP5_Moderate

The NM_003070.5(SMARCA2):​c.3475C>G​(p.Arg1159Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R1159L) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: SMARCA2 NM_003070.5 missense
• Clinical Significance: Pathogenic criteria provided, single submitter P:2 O:1
• Conservation: PhyloP100: 0.865

Genes affected

SMARCA2 (HGNC:11098): (SWI/SNF related, matrix associated, actin dependent regulator of chromatin, subfamily a, member 2) The protein encoded by this gene is a member of the SWI/SNF family of proteins and is highly similar to the brahma protein of Drosophila. Members of this family have helicase and ATPase activities and are thought to regulate transcription of certain genes by altering the chromatin structure around those genes. The encoded protein is part of the large ATP-dependent chromatin remodeling complex SNF/SWI, which is required for transcriptional activation of genes normally repressed by chromatin. Alternatively spliced transcript variants encoding different isoforms have been found for this gene, which contains a trinucleotide repeat (CAG) length polymorphism. [provided by RefSeq, Jan 2014]

ACMG classification

Verdict is Pathogenic. Variant got 13 ACMG points.

• PM1: In a hotspot region, there are 9 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 2 uncertain in NM_003070.5
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr9-2115841-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 30010.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), SMARCA2. . Gene score misZ 5.054 (greater than the threshold 3.09). Trascript score misZ 4.663 (greater than threshold 3.09). GenCC has associacion of gene with intellectual disability-sparse hair-brachydactyly syndrome, Coffin-Siris syndrome 1.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.992
• PP5: Variant 9-2115840-C-G is Pathogenic according to our data. Variant chr9-2115840-C-G is described in ClinVar as [Pathogenic]. Clinvar id is 30012.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr9-2115840-C-G is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SMARCA2	NM_003070.5	c.3475C>G	p.Arg1159Gly	missense_variant	25/34	ENST00000349721.8
SMARCA2	NM_001289396.1	c.3475C>G	p.Arg1159Gly	missense_variant	25/34
SMARCA2	NM_139045.4	c.3475C>G	p.Arg1159Gly	missense_variant	25/33
SMARCA2	NM_001289397.2	c.3301C>G	p.Arg1101Gly	missense_variant	25/33

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SMARCA2	ENST00000349721.8	c.3475C>G	p.Arg1159Gly	missense_variant	25/34	5	NM_003070.5	P2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2 Other:1

Revision: criteria provided, single submitter

Submissions by phenotype

Nicolaides-Baraitser syndrome Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Nov 04, 2019	Variant summary: SMARCA2 c.3475C>G (p.Arg1159Gly) results in a non-conservative amino acid change located in the Helicase, C-terminal domain (IPR001650) of the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant was absent in 250800 control chromosomes (gnomAD). c.3475C>G has been reported in the literature in individuals affected with Nicolaides-Baraitser syndrome (e.g. VanHoudt_2012, Sousa_2014), and was detected as a de-novo mutation in at least one of these patients (VanHoudt_2012). These data indicate that the variant may be associated with disease. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014. In addition, p.R1159Q and p.R1159L have been reported in patients with Nicolaides-Baraitser syndrome (HGMD database). Based on the evidence outlined above, the variant was classified as pathogenic. -
Pathogenic, no assertion criteria provided	literature only	OMIM	Feb 26, 2012	- -

not provided Other:1

not provided, no classification provided

literature only

UniProtKB/Swiss-Prot

-

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.53	D
BayesDel_noAF	Pathogenic	0.52
CADD	Uncertain	25
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.94	.;.;D;.;D
Eigen	Uncertain	0.55
Eigen_PC	Uncertain	0.38
FATHMM_MKL	Uncertain	0.82	D
LIST_S2	Pathogenic	0.99	.;D;.;D;D
M_CAP	Pathogenic	0.84	D
MetaRNN	Pathogenic	0.99	D;D;D;D;D
MetaSVM	Pathogenic	0.99	D
MutationAssessor	Pathogenic	5.2	H;.;H;H;H
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Pathogenic	0.89	D
PROVEAN	Pathogenic	-6.5	D;.;D;D;D
REVEL	Pathogenic	0.96
Sift	Uncertain	0.0010	D;.;D;D;D
Sift4G	Pathogenic	0.0010	D;D;D;D;D
Polyphen		1.0	D;.;D;D;D
Vest4		0.97
MutPred		0.92		Loss of MoRF binding (P = 0.068);.;Loss of MoRF binding (P = 0.068);Loss of MoRF binding (P = 0.068);Loss of MoRF binding (P = 0.068);
MVP		1.0
MPC		2.4
ClinPred		0.99	D
GERP RS		2.6
Varity_R		0.96
gMVP		1.0

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs281875184; hg19: chr9-2115840;