8-144360499-C-T

Variant names:

Variant summary

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

The NM_001363118.2(SLC52A2):c.1001+6C>T variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000623 in 1,591,752 control chromosomes in the GnomAD database, including 4 homozygotes. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.0029 ( 3 hom., cov: 33)

Exomes 𝑓: 0.00039 ( 1 hom. )

Consequence

SLC52A2
NM_001363118.2 splice_region, intron

Scores

Splicing: ADA: 0.00007872

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:3

Conservation

PhyloP100: 0.0490

Publications

0 publications found

Variant links:

Genes affected

SLC52A2 (HGNC:30224): (solute carrier family 52 member 2) This gene encodes a membrane protein which belongs to the riboflavin transporter family. In humans, riboflavin must be obtained by intestinal absorption because it cannot be synthesized by the body. The water-soluble vitamin riboflavin is processed to the coenzymes flavin mononucleotide (FMN) and flavin adenine dinucleotide (FAD) which then act as intermediaries in many cellular metabolic reactions. Paralogous members of the riboflavin transporter gene family are located on chromosomes 17 and 20. Unlike other members of this family, this gene has higher expression in brain tissue than small intestine. Alternative splicing of this gene results in multiple transcript variants encoding the same protein. Mutations in this gene have been associated with Brown-Vialetto-Van Laere syndrome 2 - an autosomal recessive progressive neurologic disorder characterized by deafness, bulbar dysfunction, and axial and limb hypotonia. [provided by RefSeq, Jul 2012]

SLC52A2 Gene-Disease associations (from GenCC):

Brown-Vialetto-van Laere syndrome 2
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: ClinGen, Genomics England PanelApp, PanelApp Australia, Labcorp Genetics (formerly Invitae), G2P

SLC52A2 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 (BayesDel_noAF=-0.82).

BP6

Variant 8-144360499-C-T is Benign according to our data. Variant chr8-144360499-C-T is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 540439.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 = 0.00287 (437/152392) while in subpopulation AFR AF = 0.00966 (402/41602). AF 95% confidence interval is 0.00888. There are 3 homozygotes in GnomAd4. There are 202 alleles in the male GnomAd4 subpopulation. Median coverage is 33. This position passed quality control check.

BS2

High Homozygotes in GnomAd4 at 3 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SLC52A2	NM_001363118.2 link	c.1001+6C>T		splice_region_variant, intron_variant	Intron 3 of 4	ENST00000643944.2	NP_001350047.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SLC52A2	ENST00000643944.2 link	c.1001+6C>T		splice_region_variant, intron_variant	Intron 3 of 4		NM_001363118.2	ENSP00000496184.2		Q9HAB3

Frequencies

GnomAD3 genomes

AF:

0.00288

AC:

438

AN:

152274

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00972

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00137

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:

0.000103

Gnomad OTH

AF:

0.00335

GnomAD2 exomes

AF:

0.000860

AC:

203

AN:

236120

AF XY:

0.000668

show subpopulations

Gnomad AFR exome

AF:

0.00996

Gnomad AMR exome

AF:

0.000881

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000730

Gnomad OTH exome

AF:

0.000845

GnomAD4 exome

AF:

0.000386

AC:

555

AN:

1439360

Hom.:

Cov.:

AF XY:

0.000348

AC XY:

249

AN XY:

714952

show subpopulations

African (AFR)

AF:

0.0104

AC:

346

AN:

33278

American (AMR)

AF:

0.000858

AC:

AN:

44306

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25592

East Asian (EAS)

AF:

0.00

AC:

AN:

39486

South Asian (SAS)

AF:

0.0000350

AC:

AN:

85594

European-Finnish (FIN)

AF:

0.00

AC:

AN:

40392

Middle Eastern (MID)

AF:

0.00122

AC:

AN:

5734

European-Non Finnish (NFE)

AF:

0.0000977

AC:

108

AN:

1105216

Other (OTH)

AF:

0.000887

AC:

AN:

59762

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.489

Heterozygous variant carriers

121

162

202

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

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

GnomAD4 genome

AF:

0.00287

AC:

437

AN:

152392

Hom.:

Cov.:

AF XY:

0.00271

AC XY:

202

AN XY:

74526

show subpopulations

African (AFR)

AF:

0.00966

AC:

402

AN:

41602

American (AMR)

AF:

0.00137

AC:

AN:

15308

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5186

South Asian (SAS)

AF:

0.00

AC:

AN:

4832

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10630

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.000103

AC:

AN:

68042

Other (OTH)

AF:

0.00331

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.491

Heterozygous variant carriers

113

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:

0.000600

Hom.:

Bravo

AF:

0.00357

Asia WGS

AF:

0.000577

AC:

AN:

3478

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Benign:2

Feb 11, 2019

GeneDx

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Jul 01, 2023

CeGaT Center for Human Genetics Tuebingen

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

SLC52A2: BP4, BS2 -

Brown-Vialetto-van Laere syndrome 2

Benign:1

Jan 17, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.82

CADD

Benign

4.2

(source)

DANN

Benign

0.57

PhyloP100

0.049

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Mutation Taster

=91/9

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.000079

dbscSNV1_RF

Benign

0.010

SpliceAI score (max)

0.0

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