chr19-11007921-C-T

Variant names:

• chr19-11007921-C-T
• rs747463080
• NM_001387283.1:c.2021C>T

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 0P and 3B. BP4_Moderate BS1_Supporting

The NM_001128849.3(SMARCA4):​c.2021C>T​(p.Pro674Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000384 in 1,613,432 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P674T) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.0000066 (0 hom., cov: 31)
  • Exomes 𝑓: 0.000042 (0 hom.)
• Consequence: SMARCA4 NM_001128849.3 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:7 B:1
• Conservation: PhyloP100: 3.14
• Publications: 2 publications found

Genes affected

SMARCA4 (HGNC:11100): (SWI/SNF related, matrix associated, actin dependent regulator of chromatin, subfamily a, member 4) The protein encoded by this gene is a member of the SWI/SNF family of proteins and is 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. In addition, this protein can bind BRCA1, as well as regulate the expression of the tumorigenic protein CD44. Mutations in this gene cause rhabdoid tumor predisposition syndrome type 2. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, May 2012]

SMARCA4 Gene-Disease associations (from GenCC):

• Coffin-Siris syndrome

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet, Illumina
• intellectual disability, autosomal dominant 16

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae), Ambry Genetics
• rhabdoid tumor predisposition syndrome 2

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, ClinGen, Genomics England PanelApp, Labcorp Genetics (formerly Invitae), G2P
• uterine corpus sarcoma

  Inheritance: AR Classification: MODERATE Submitted by: Genomics England PanelApp
• familial rhabdoid tumor

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• hereditary nonpolyposis colon cancer

  Inheritance: AD Classification: LIMITED Submitted by: ClinGen

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.17976066).
• BS1: Variant frequency is greater than expected in population mid. GnomAdExome4 allele frequency = 0.0000417 (61/1461452) while in subpopulation MID AF = 0.000173 (1/5768). AF 95% confidence interval is 0.0000418. There are 0 homozygotes in GnomAdExome4. There are 40 alleles in the male GnomAdExome4 subpopulation. Median coverage is 31. This position passed quality control check. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001128849.3. 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
	SMARCA4	NM_001387283.1	MANE Plus Clinical	c.2021C>T	p.Pro674Leu	missense	Exon 14 of 36	NP_001374212.1
	SMARCA4	NM_003072.5	MANE Select	c.2021C>T	p.Pro674Leu	missense	Exon 14 of 35	NP_003063.2
	SMARCA4	NM_001128849.3		c.2021C>T	p.Pro674Leu	missense	Exon 14 of 36	NP_001122321.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SMARCA4	ENST00000646693.2	MANE Plus Clinical	c.2021C>T	p.Pro674Leu	missense	Exon 14 of 36	ENSP00000495368.1
	SMARCA4	ENST00000344626.10	TSL:1 MANE Select	c.2021C>T	p.Pro674Leu	missense	Exon 14 of 35	ENSP00000343896.4
	SMARCA4	ENST00000643549.1		c.2021C>T	p.Pro674Leu	missense	Exon 14 of 35	ENSP00000493975.1

Frequencies

GnomAD3 genomes AF: 0.00000658 AC: 1 AN: 151980 Hom.: 0 Cov.: 31

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000398 AC: 10 AN: 251184 AF XY: 0.0000442

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000578

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000704

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000417 AC: 61 AN: 1461452 Hom.: 0 Cov.: 31 AF XY: 0.0000550 AC XY: 40 AN XY: 727046

African (AFR) AF: 0.00 AC: 0 AN: 33458

American (AMR) AF: 0.0000224 AC: 1 AN: 44716

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26126

East Asian (EAS) AF: 0.00 AC: 0 AN: 39684

South Asian (SAS) AF: 0.00 AC: 0 AN: 86250

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53306

Middle Eastern (MID) AF: 0.000173 AC: 1 AN: 5768

European-Non Finnish (NFE) AF: 0.0000531 AC: 59 AN: 1111766

Other (OTH) AF: 0.00 AC: 0 AN: 60378

GnomAD4 genome AF: 0.00000658 AC: 1 AN: 151980 Hom.: 0 Cov.: 31 AF XY: 0.0000135 AC XY: 1 AN XY: 74230

African (AFR) AF: 0.00 AC: 0 AN: 41368

American (AMR) AF: 0.00 AC: 0 AN: 15258

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5168

South Asian (SAS) AF: 0.00 AC: 0 AN: 4810

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10598

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.0000147 AC: 1 AN: 67996

Other (OTH) AF: 0.00 AC: 0 AN: 2084

Alfa AF: 0.0000918 Hom.: 0

Bravo AF: 0.0000227

ExAC AF: 0.0000330 AC: 4

EpiCase AF: 0.00

EpiControl AF: 0.000119

ClinVar

ClinVar submissions as Germline

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
-	1	1	Hereditary cancer-predisposing syndrome (2)
-	2	-	not provided (2)
-	2	-	Rhabdoid tumor predisposition syndrome 2 (2)
-	1	-	Intellectual disability, autosomal dominant 16 (1)
-	1	-	SMARCA4-related disorder (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.075
BayesDel_addAF	Benign	-0.074	T
BayesDel_noAF	Benign	-0.16
CADD	Uncertain	25
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.48	T
Eigen	Benign	-0.037
Eigen_PC	Benign	0.17
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Uncertain	0.96	D
M_CAP	Benign	0.026	D
MetaRNN	Benign	0.18	T
MetaSVM	Benign	-0.36	T
MutationAssessor	Benign	0.69	N
PhyloP100		3.1
PrimateAI	Uncertain	0.52	T
PROVEAN	Benign	-1.9	N
REVEL	Benign	0.27
Sift	Uncertain	0.023	D
Sift4G	Benign	0.10	T
Polyphen		0.25	B
Vest4		0.44
MutPred		0.18		Gain of stability (P = 0.0197)
MVP		0.77
MPC		1.3
ClinPred		0.12	T
GERP RS		5.6
RBP_binding_hub_radar		1.0
RBP_regulation_power_radar		2.8
Varity_R		0.062
gMVP		0.72
Mutation Taster		=82/18	polymorphism

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

Other links and lift over

dbSNP: rs747463080; hg19: chr19-11118597;