Genetic Variant NM_033409.4:c.521A>G (chr20-765254-T-C) – ACMG Classification: Benign (-20 pts)

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_033409.4(SLC52A3):c.521A>G(p.Asp174Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00182 in 1,614,158 control chromosomes in the GnomAD database, including 29 homozygotes. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.0096 ( 15 hom., cov: 32)

Exomes 𝑓: 0.0010 ( 14 hom. )

Consequence

SLC52A3
NM_033409.4 missense

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:5

Conservation

PhyloP100: 0.418

Publications

6 publications found

Variant links:

Genes affected

SLC52A3 (HGNC:16187): (solute carrier family 52 member 3) This gene encodes a riboflavin transporter protein that is strongly expressed in the intestine and likely plays a role in intestinal absorption of riboflavin. The protein is predicted to have eleven transmembrane domains and a cell surface localization signal in the C-terminus. Mutations at this locus have been associated with Brown-Vialetto-Van Laere syndrome and Fazio-Londe disease. [provided by RefSeq, Mar 2012]

SLC52A3 Gene-Disease associations (from GenCC):

Brown-Vialetto-van Laere syndrome 1
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: ClinGen, Ambry Genetics, PanelApp Australia, Genomics England PanelApp, G2P, Labcorp Genetics (formerly Invitae)
progressive bulbar palsy
Inheritance: AR Classification: MODERATE Submitted by: Ambry Genetics

SLC52A3 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -20 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.003783226).

BP6

Variant 20-765254-T-C is Benign according to our data. Variant chr20-765254-T-C is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 476611.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.00964 (1468/152268) while in subpopulation AFR AF = 0.0333 (1383/41544). AF 95% confidence interval is 0.0318. There are 15 homozygotes in GnomAd4. There are 684 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High Homozygotes in GnomAd4 at 15 AR gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_033409.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
SLC52A3	NM_033409.4	MANE Select	c.521A>G	p.Asp174Gly	missense	Exon 2 of 5	NP_212134.3
SLC52A3	NM_001370085.1		c.521A>G	p.Asp174Gly	missense	Exon 3 of 6	NP_001357014.1	Q9NQ40-1
SLC52A3	NM_001370086.1		c.521A>G	p.Asp174Gly	missense	Exon 3 of 6	NP_001357015.1	Q9NQ40-1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
SLC52A3	ENST00000645534.1	MANE Select	c.521A>G	p.Asp174Gly	missense	Exon 2 of 5	ENSP00000494193.1	Q9NQ40-1
SLC52A3	ENST00000217254.11	TSL:5	c.521A>G	p.Asp174Gly	missense	Exon 3 of 6	ENSP00000217254.7	Q9NQ40-1
SLC52A3	ENST00000488495.3	TSL:3	c.521A>G	p.Asp174Gly	missense	Exon 2 of 5	ENSP00000494009.1	Q9NQ40-1

Frequencies

GnomAD3 genomes

AF:

0.00958

AC:

1458

AN:

152150

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0331

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00341

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000415

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000176

Gnomad OTH

AF:

0.00908

GnomAD2 exomes

AF:

0.00271

AC:

682

AN:

251460

AF XY:

0.00198

show subpopulations

Gnomad AFR exome

AF:

0.0372

Gnomad AMR exome

AF:

0.00145

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000114

Gnomad OTH exome

AF:

0.00163

GnomAD4 exome

AF:

0.00101

AC:

1477

AN:

1461890

Hom.:

Cov.:

AF XY:

0.000884

AC XY:

643

AN XY:

727246

show subpopulations

African (AFR)

AF:

0.0356

AC:

1191

AN:

33480

American (AMR)

AF:

0.00174

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:

0.000139

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53416

Middle Eastern (MID)

AF:

0.00277

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.0000459

AC:

AN:

1112012

Other (OTH)

AF:

0.00214

AC:

129

AN:

60396

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.488

Heterozygous variant carriers

195

292

390

487

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

126

168

210

<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:

0.00964

AC:

1468

AN:

152268

Hom.:

Cov.:

AF XY:

0.00919

AC XY:

684

AN XY:

74448

show subpopulations

African (AFR)

AF:

0.0333

AC:

1383

AN:

41544

American (AMR)

AF:

0.00340

AC:

AN:

15288

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5180

South Asian (SAS)

AF:

0.000415

AC:

AN:

4820

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10620

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.000176

AC:

AN:

68024

Other (OTH)

AF:

0.00899

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.508

Heterozygous variant carriers

149

223

298

372

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

100

<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:

0.00373

Hom.:

Bravo

AF:

0.0111

ESP6500AA

AF:

0.0315

AC:

139

ESP6500EA

AF:

0.000349

AC:

ExAC

AF:

0.00340

AC:

413

Asia WGS

AF:

0.00231

AC:

AN:

3478

EpiCase

AF:

0.00

EpiControl

AF:

0.000178

ClinVar

ClinVar submissions

Significance:Benign/Likely benign

Revision:criteria provided, multiple submitters, no conflicts

View on ClinVar

Pathogenic

VUS

Benign

Condition

not provided (3)

Brown-Vialetto-van Laere syndrome 1 (1)

not specified (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.064

BayesDel_addAF

Benign

-0.63

BayesDel_noAF

Benign

-0.64

CADD

Benign

2.0

(source)

DANN

Benign

0.69

DEOGEN2

Benign

0.0024

Eigen

Benign

-1.5

Eigen_PC

Benign

-1.5

FATHMM_MKL

Benign

0.022

LIST_S2

Benign

0.44

MetaRNN

Benign

0.0038

MetaSVM

Benign

-1.0

MutationAssessor

Benign

-0.23

PhyloP100

0.42

PrimateAI

Benign

0.25

PROVEAN

Benign

-0.33

REVEL

Benign

0.077

Sift

Benign

0.53

Sift4G

Benign

0.57

Polyphen

0.0

Vest4

0.065

MVP

0.19

MPC

0.41

ClinPred

0.0020

GERP RS

-5.7

Varity_R

0.041

gMVP

0.37

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

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over