17-40630716-G-A

Variant names:

• chr17-40630716-G-A
• rs367908836
• NM_003079.5:c.1025C>T

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 3P and 0B. PM2 PP3

The NM_003079.5(SMARCE1):​c.1025C>T​(p.Thr342Ile) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000274 in 1,461,118 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 2/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T342R) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: SMARCE1 NM_003079.5 missense, splice_region
• Scores: Splicing: ADA: 0.9979
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.54
• Publications: 0 publications found

Genes affected

SMARCE1 (HGNC:11109): (SWI/SNF related, matrix associated, actin dependent regulator of chromatin, subfamily e, member 1) The protein encoded by this gene is part of the large ATP-dependent chromatin remodeling complex SWI/SNF, which is required for transcriptional activation of genes normally repressed by chromatin. The encoded protein, either alone or when in the SWI/SNF complex, can bind to 4-way junction DNA, which is thought to mimic the topology of DNA as it enters or exits the nucleosome. The protein contains a DNA-binding HMG domain, but disruption of this domain does not abolish the DNA-binding or nucleosome-displacement activities of the SWI/SNF complex. Unlike most of the SWI/SNF complex proteins, this protein has no yeast counterpart. [provided by RefSeq, Jul 2008]

SMARCE1 Gene-Disease associations (from GenCC):

• familial meningioma

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen, G2P, Ambry Genetics
• Coffin-Siris syndrome 5

  Inheritance: AD Classification: STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, G2P
• Coffin-Siris syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• familial multiple meningioma

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ENSG00000264058 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: Splicing predictors support a deleterious effect. Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF. No scorers claiming Uncertain. Scorers claiming Benign: max_spliceai.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_003079.5. 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
	SMARCE1	NM_003079.5	MANE Select	c.1025C>T	p.Thr342Ile	missense splice_region	Exon 10 of 11	NP_003070.3

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SMARCE1	ENST00000348513.12	TSL:1 MANE Select	c.1025C>T	p.Thr342Ile	missense splice_region	Exon 10 of 11	ENSP00000323967.6
	SMARCE1	ENST00000578044.6	TSL:1	c.815C>T	p.Thr272Ile	missense splice_region	Exon 7 of 8	ENSP00000464511.1
	SMARCE1	ENST00000377808.9	TSL:1	c.920C>T	p.Thr307Ile	missense splice_region	Exon 9 of 11	ENSP00000367039.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1461118 Hom.: 0 Cov.: 31 AF XY: 0.00000550 AC XY: 4 AN XY: 726942

African (AFR) AF: 0.00 AC: 0 AN: 33464

American (AMR) AF: 0.00 AC: 0 AN: 44722

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26132

East Asian (EAS) AF: 0.00 AC: 0 AN: 39692

South Asian (SAS) AF: 0.00 AC: 0 AN: 86242

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53386

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00000360 AC: 4 AN: 1111346

Other (OTH) AF: 0.00 AC: 0 AN: 60366

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary cancer-predisposing syndrome Uncertain:1

Nov 08, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.1025C>T (p.T342I) alteration is located in exon 10 (coding exon 9) of the SMARCE1 gene. This alteration results from a C to T substitution at nucleotide position 1025, causing the threonine (T) at amino acid position 342 to be replaced by an isoleucine (I). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear.

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.19
BayesDel_addAF	Benign	-0.078	T
BayesDel_noAF	Benign	-0.35
CADD	Pathogenic	26
DANN	Uncertain	0.99
DEOGEN2	Benign	0.11	T
Eigen	Benign	0.026
Eigen_PC	Benign	0.21
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Benign	0.45	T
M_CAP	Benign	0.020	T
MetaRNN	Benign	0.11	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	0.81	L
PhyloP100		3.5
PrimateAI	Uncertain	0.62	T
PROVEAN	Benign	-0.59	N
REVEL	Benign	0.064
Sift	Benign	0.13	T
Sift4G	Benign	0.14	T
Polyphen		0.14	B
Vest4		0.51
MutPred		0.18		Loss of loop (P = 0.0112)
MVP		0.31
MPC		1.5
ClinPred		0.71	D
GERP RS		5.3
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.073
gMVP		0.11
Mutation Taster		=48/52	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.95
SpliceAI score (max)		0.050		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: rs367908836; hg19: chr17-38786968;