rs79401259

chr11-9787636-G-Achr11-9787636-G-Cchr11-9787636-G-T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 0P and 2B. BP4_Moderate

The NM_030962.4(SBF2):c.5035C>T(p.Arg1679Cys) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000134 in 1,613,712 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. 16/22 in silico tools predict a benign outcome for this variant. 2/2 splice prediction tools predict no significant impact on 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. R1679H) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000059 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00014 ( 2 hom. )

Consequence

SBF2
NM_030962.4 missense, splice_region

Scores

Splicing: ADA: 0.8497

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 2.32

Variant links:

Genes affected

SBF2 (HGNC:2135): (SET binding factor 2) This gene encodes a pseudophosphatase and member of the myotubularin-related protein family. This gene maps within the CMT4B2 candidate region of chromosome 11p15 and mutations in this gene have been associated with Charcot-Marie-Tooth Disease, type 4B2. [provided by RefSeq, Jul 2008]

SBF2 links:

SBF2-AS1 (HGNC:27438): (SBF2 antisense RNA 1)

SBF2-AS1 links:

LOC105369149 (HGNC:):

LOC105369149 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -2 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.096526414).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
SBF2	NM_030962.4 linkuse as main transcript	c.5035C>T	p.Arg1679Cys	missense_variant, splice_region_variant	36/40	ENST00000256190.13
SBF2-AS1	NR_036485.1 linkuse as main transcript	n.212-20212G>A		intron_variant, non_coding_transcript_variant
LOC105369149	XR_007062587.1 linkuse as main transcript	n.355+2860G>A		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SBF2	ENST00000256190.13 linkuse as main transcript	c.5035C>T	p.Arg1679Cys	missense_variant, splice_region_variant	36/40	1	NM_030962.4	P3	Q86WG5-1
SBF2-AS1	ENST00000663578.1 linkuse as main transcript	n.237-20212G>A		intron_variant, non_coding_transcript_variant

Frequencies

GnomAD3 genomes

AF:

0.0000592

AC:

AN:

152146

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00115

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000199

AC:

AN:

251454

Hom.:

AF XY:

0.00000736

AC XY:

AN XY:

135896

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000163

Gnomad SAS exome

AF:

0.0000327

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.000142

AC:

208

AN:

1461448

Hom.:

Cov.:

AF XY:

0.000121

AC XY:

AN XY:

727030

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00516

Gnomad4 SAS exome

AF:

0.0000116

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

9.00e-7

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.0000591

AC:

AN:

152264

Hom.:

Cov.:

AF XY:

0.0000537

AC XY:

AN XY:

74446

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00116

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000294

Gnomad4 OTH

AF:

0.00

ExAC

AF:

0.0000330

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Nov 05, 2019

The p.R1679C variant (also known as c.5035C>T), located in coding exon 36 of the SBF2 gene, results from a C to T substitution at nucleotide position 5035. The arginine at codon 1679 is replaced by cysteine, an amino acid with highly dissimilar properties. This amino acid position is poorly conserved in available vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Charcot-Marie-Tooth disease type 4B2

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Apr 27, 2017

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases did not allow this variant to be ruled in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -

Charcot-Marie-Tooth disease type 4

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Apr 29, 2022

This sequence change replaces arginine, which is basic and polar, with cysteine, which is neutral and slightly polar, at codon 1679 of the SBF2 protein (p.Arg1679Cys). This variant is present in population databases (rs79401259, gnomAD 0.01%). This variant has not been reported in the literature in individuals affected with SBF2-related conditions. ClinVar contains an entry for this variant (Variation ID: 71400). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0"). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.083

BayesDel_addAF

Benign

-0.18

BayesDel_noAF

Benign

-0.28

Cadd

Pathogenic

Dann

Benign

0.97

DEOGEN2

Benign

0.12

T;.

Eigen

Benign

0.085

Eigen_PC

Benign

0.17

FATHMM_MKL

Uncertain

0.96

LIST_S2

Benign

0.83

T;T

M_CAP

Benign

0.030

MetaRNN

Benign

0.097

T;T

MetaSVM

Benign

-0.60

MutationAssessor

Benign

0.69

N;.

MutationTaster

Benign

0.98

PrimateAI

Benign

0.21

PROVEAN

Benign

-1.1

N;N

REVEL

Benign

0.26

Sift

Benign

0.037

D;D

Sift4G

Uncertain

0.019

D;D

Polyphen

0.72

P;.

Vest4

0.24

MVP

0.87

MPC

0.37

ClinPred

0.17

GERP RS

6.2

Varity_R

0.073

gMVP

0.37

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.85

dbscSNV1_RF

Benign

0.64

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over