rs147772705

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 0P and 5B. BP4_StrongBS1_Supporting

The NM_030962.4(SBF2):c.4805A>G(p.Lys1602Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000874 in 1,614,166 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 17/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.00047 ( 1 hom., cov: 32)

Exomes 𝑓: 0.000048 ( 0 hom. )

Consequence

SBF2
NM_030962.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:5

Conservation

PhyloP100: 1.73

Publications

0 publications found

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 was made for transcript

Our verdict: Likely_benign. The variant received -5 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.014833063).

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.000466 (71/152282) while in subpopulation AFR AF = 0.00166 (69/41566). AF 95% confidence interval is 0.00135. There are 1 homozygotes in GnomAd4. There are 41 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SBF2	NM_030962.4 link	c.4805A>G	p.Lys1602Arg	missense_variant	Exon 35 of 40	ENST00000256190.13	NP_112224.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SBF2	ENST00000256190.13 link	c.4805A>G	p.Lys1602Arg	missense_variant	Exon 35 of 40	1	NM_030962.4	ENSP00000256190.8

Frequencies

GnomAD3 genomes

AF:

0.000414

AC:

AN:

152164

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00147

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000107

AC:

AN:

251476

AF XY:

0.000110

show subpopulations

Gnomad AFR exome

AF:

0.00142

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:

0.00000879

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000479

AC:

AN:

1461884

Hom.:

Cov.:

AF XY:

0.0000468

AC XY:

AN XY:

727246

show subpopulations

African (AFR)

AF:

0.00143

AC:

AN:

33480

American (AMR)

AF:

0.0000671

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.000116

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53416

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

8.99e-7

AC:

AN:

1112006

Other (OTH)

AF:

0.000132

AC:

AN:

60396

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.473

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000466

AC:

AN:

152282

Hom.:

Cov.:

AF XY:

0.000551

AC XY:

AN XY:

74450

show subpopulations

African (AFR)

AF:

0.00166

AC:

AN:

41566

American (AMR)

AF:

0.000131

AC:

AN:

15306

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3468

East Asian (EAS)

AF:

0.00

AC:

AN:

5178

South Asian (SAS)

AF:

0.00

AC:

AN:

4820

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10614

Middle Eastern (MID)

AF:

0.00

AC:

AN:

292

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68012

Other (OTH)

AF:

0.00

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.491

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000249

Hom.:

Bravo

AF:

0.000540

ESP6500AA

AF:

0.00204

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000148

AC:

Asia WGS

AF:

0.000577

AC:

AN:

3478

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Charcot-Marie-Tooth disease

Uncertain:1

Molecular Genetics Laboratory, London Health Sciences Centre

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Inborn genetic diseases

Uncertain:1

Jan 24, 2023

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.4805A>G (p.K1602R) alteration is located in coding exon 35 of the SBF2 gene. This alteration results from a A to G substitution at nucleotide position 4805, causing the lysine (K) at amino acid position 1602 to be replaced by an arginine (R). Based on data from the Genome Aggregation Database (gnomAD), the SBF2 c.4805A>G alteration was observed in 0.015% (42/282,866) total alleles studied, with a frequency of 0.152% (38/24,960) in the African subpopulation. The p.K1602 amino acid is not well conserved in available vertebrate species, and arginine is the reference allele for multiple species. The p.K1602R alteration is predicted to be benign by Polyphen and tolerated by SIFT in silico analyses. Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Charcot-Marie-Tooth disease type 4B2

Uncertain:1

May 15, 2020

Baylor Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant was determined to be of uncertain significance according to ACMG Guidelines, 2015 [PMID:25741868]. -

not provided

Uncertain:1

Dec 19, 2022

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Previously reported as a variant of uncertain significance in an individual with a suspected diagnosis of CMT; however, clinical and segregation information was not provided (Volodarsky et al., 2021); In silico analysis supports that this missense variant does not alter protein structure/function; This variant is associated with the following publications: (PMID: 32376792) -

Charcot-Marie-Tooth disease type 4

Uncertain:1

Nov 06, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces lysine, which is basic and polar, with arginine, which is basic and polar, at codon 1602 of the SBF2 protein (p.Lys1602Arg). This variant is present in population databases (rs147772705, gnomAD 0.2%). This missense change has been observed in individual(s) with clinical features of Charcot-Marie-Tooth disease (PMID: 32376792). ClinVar contains an entry for this variant (Variation ID: 566427). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is not expected to disrupt SBF2 protein function with a negative predictive value of 80%. 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

0.062

BayesDel_addAF

Benign

-0.45

BayesDel_noAF

Benign

-0.43

CADD

Benign

(source)

DANN

Benign

0.94

DEOGEN2

Benign

0.11

Eigen

Benign

-0.63

Eigen_PC

Benign

-0.44

FATHMM_MKL

Uncertain

0.81

LIST_S2

Benign

0.63

M_CAP

Benign

0.013

MetaRNN

Benign

0.015

MetaSVM

Benign

-0.73

MutationAssessor

Benign

1.4

PhyloP100

1.7

PrimateAI

Benign

0.41

PROVEAN

Benign

-0.89

REVEL

Benign

0.21

Sift

Benign

0.49

Sift4G

Benign

0.59

Polyphen

0.0010

Vest4

0.049

MVP

0.74

MPC

0.14

ClinPred

0.0056

GERP RS

2.3

Varity_R

0.025

gMVP

0.24

Mutation Taster

=98/2

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over