chr9-2081995-C-G

Position:

• chr9-2081995-C-G

Variant summary

Our verdict is Pathogenic. Variant got 19 ACMG points: 19P and 0B. PM1 PM2 PM5 PP2 PP3_Strong PP5_Very_Strong

The NM_003070.5(SMARCA2):​c.2348C>G​(p.Ser783Trp) variant causes a missense, splice region 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. 3/3 splice prediction tools predict no significant impact on normal splicing. 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. S783L) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: SMARCA2 NM_003070.5 missense, splice_region
• Scores: Splicing: ADA: 0.7826
• Clinical Significance: Likely pathogenic criteria provided, multiple submitters, no conflicts P:2
• Conservation: PhyloP100: 7.82

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 19 ACMG points.

• PM1: In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 3 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 chr9-2081995-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 561113.We mark this variant Likely_pathogenic, oryginal submissions are: {Pathogenic=1, Likely_pathogenic=1, Uncertain_significance=1}.
• 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, 0.97
• PP5: Variant 9-2081995-C-G is Pathogenic according to our data. Variant chr9-2081995-C-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 436803.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SMARCA2	NM_003070.5	c.2348C>G	p.Ser783Trp	missense_variant, splice_region_variant	15/34	ENST00000349721.8
SMARCA2	NM_001289396.1	c.2348C>G	p.Ser783Trp	missense_variant, splice_region_variant	15/34
SMARCA2	NM_139045.4	c.2348C>G	p.Ser783Trp	missense_variant, splice_region_variant	15/33
SMARCA2	NM_001289397.2	c.2348C>G	p.Ser783Trp	missense_variant, splice_region_variant	15/33

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SMARCA2	ENST00000349721.8	c.2348C>G	p.Ser783Trp	missense_variant, splice_region_variant	15/34	5	NM_003070.5	P2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Nicolaides-Baraitser syndrome Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Genetic Services Laboratory, University of Chicago

Oct 02, 2015

- -

Intellectual disability Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Diagnostic Laboratory, Strasbourg University Hospital

Sep 10, 2020

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.54	D
BayesDel_noAF	Pathogenic	0.54
CADD	Pathogenic	32
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.98	.;.;D;.;D
Eigen	Pathogenic	1.1
Eigen_PC	Pathogenic	0.97
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Pathogenic	0.99	.;D;.;D;D
M_CAP	Pathogenic	0.78	D
MetaRNN	Pathogenic	0.97	D;D;D;D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	4.4	H;.;H;H;H
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Pathogenic	0.91	D
PROVEAN	Pathogenic	-6.6	D;.;D;D;D
REVEL	Pathogenic	0.99
Sift	Pathogenic	0.0	D;.;D;D;D
Sift4G	Pathogenic	0.0	D;D;D;D;D
Polyphen		1.0	D;.;D;D;D
Vest4		0.88
MutPred		0.84		Loss of catalytic residue at T784 (P = 0.1996);Loss of catalytic residue at T784 (P = 0.1996);Loss of catalytic residue at T784 (P = 0.1996);Loss of catalytic residue at T784 (P = 0.1996);Loss of catalytic residue at T784 (P = 0.1996);
MVP		0.95
MPC		1.7
ClinPred		1.0	D
GERP RS		5.4
Varity_R		0.99
gMVP		0.96

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.78
dbscSNV1_RF	Benign	0.41
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

Publications

LitVar

Other links and lift over

dbSNP: rs1554623112; hg19: chr9-2081995;