8-120541973-C-T

Position:

• chr8-120541973-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_021021.4(SNTB1):​c.1361G>A​(p.Arg454His) variant causes a missense change. The variant allele was found at a frequency of 0.0000713 in 1,613,638 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: 𝑓 0.000053 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000073 (0 hom.)
• Consequence: SNTB1 NM_021021.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.56

Genes affected

SNTB1 (HGNC:11168): (syntrophin beta 1) Dystrophin is a large, rod-like cytoskeletal protein found at the inner surface of muscle fibers. Dystrophin is missing in Duchenne Muscular Dystrophy patients and is present in reduced amounts in Becker Muscular Dystrophy patients. The protein encoded by this gene is a peripheral membrane protein found associated with dystrophin and dystrophin-related proteins. This gene is a member of the syntrophin gene family, which contains at least two other structurally-related genes. [provided by RefSeq, Jul 2008]

MTBP (HGNC:):

MTBP (HGNC:7417): (MDM2 binding protein) This gene encodes a protein that interacts with the oncoprotein mouse double minute 2. The encoded protein regulates progression through the cell cycle and may be involved in tumor formation. [provided by RefSeq, Aug 2012]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.19465).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SNTB1	NM_021021.4	c.1361G>A	p.Arg454His	missense_variant	6/7	ENST00000517992.2	NP_066301.1
SNTB1	XM_047422126.1	c.782G>A	p.Arg261His	missense_variant	6/7		XP_047278082.1
SNTB1	XM_047422127.1	c.782G>A	p.Arg261His	missense_variant	6/7		XP_047278083.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SNTB1	ENST00000517992.2	c.1361G>A	p.Arg454His	missense_variant	6/7	1	NM_021021.4	ENSP00000431124.1

Frequencies

GnomAD3 genomes AF: 0.0000526 AC: 8 AN: 152102 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000483

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000193

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000588

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.000151 AC: 38 AN: 251026 Hom.: 0 AF XY: 0.000155 AC XY: 21 AN XY: 135678

Gnomad AFR exome AF: 0.000123

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000981

Gnomad SAS exome AF: 0.000295

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000704

Gnomad OTH exome AF: 0.000163

GnomAD4 exome AF: 0.0000732 AC: 107 AN: 1461420 Hom.: 0 Cov.: 31 AF XY: 0.0000729 AC XY: 53 AN XY: 726978

Gnomad4 AFR exome AF: 0.0000897

Gnomad4 AMR exome AF: 0.0000224

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00111

Gnomad4 SAS exome AF: 0.000244

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000252

Gnomad4 OTH exome AF: 0.000149

GnomAD4 genome AF: 0.0000526 AC: 8 AN: 152218 Hom.: 0 Cov.: 32 AF XY: 0.0000269 AC XY: 2 AN XY: 74422

Gnomad4 AFR AF: 0.0000481

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.000193

Gnomad4 SAS AF: 0.000207

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000588

Gnomad4 OTH AF: 0.00

Alfa AF: 0.000130 Hom.: 0

Bravo AF: 0.0000756

ESP6500AA AF: 0.000227 AC: 1

ESP6500EA AF: 0.000116 AC: 1

ExAC AF: 0.000181 AC: 22

Asia WGS AF: 0.000289 AC: 1 AN: 3478

EpiCase AF: 0.000109

EpiControl AF: 0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jul 22, 2024

The c.1361G>A (p.R454H) alteration is located in exon 6 (coding exon 6) of the SNTB1 gene. This alteration results from a G to A substitution at nucleotide position 1361, causing the arginine (R) at amino acid position 454 to be replaced by a histidine (H). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.069
BayesDel_addAF	Uncertain	0.082	D
BayesDel_noAF	Pathogenic	0.27
CADD	Pathogenic	27
DANN	Pathogenic	1.0
DEOGEN2	Uncertain	0.57	D;D
Eigen	Pathogenic	0.71
Eigen_PC	Pathogenic	0.69
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.92	.;D
M_CAP	Benign	0.056	D
MetaRNN	Benign	0.19	T;T
MetaSVM	Uncertain	0.45	D
MutationAssessor	Uncertain	2.5	M;M
PrimateAI	Benign	0.39	T
PROVEAN	Uncertain	-2.7	D;D
REVEL	Uncertain	0.60
Sift	Uncertain	0.011	D;D
Sift4G	Uncertain	0.016	D;D
Polyphen		1.0	D;D
Vest4		0.41
MVP		0.70
ClinPred		0.54	D
GERP RS		5.4
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.34
gMVP		0.65

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: rs142514563; hg19: chr8-121554213; COSMIC: COSV67324461; COSMIC: COSV67324461;