NM_033409.4:c.933C>T

Variant names:

• chr20-763638-G-A
• rs534678154
• NM_033409.4:c.933C>T

Variant summary

Our verdict is Benign. The variant received -17 ACMG points: 0P and 17B. BP4_Strong BP6_Very_Strong BP7 BS1

The NM_033409.4(SLC52A3):​c.933C>T​(p.Asn311Asn) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000787 in 1,614,198 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.000085 (0 hom., cov: 33)
  • Exomes 𝑓: 0.000078 (1 hom.)
• Consequence: SLC52A3 NM_033409.4 synonymous
• Clinical Significance: Likely benign criteria provided, multiple submitters, no conflicts B:2
• Conservation: PhyloP100: -0.165
• Publications: 1 publications found

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: Ambry Genetics, G2P, ClinGen, Genomics England PanelApp, Labcorp Genetics (formerly Invitae), PanelApp Australia
• progressive bulbar palsy

  Inheritance: AR Classification: MODERATE Submitted by: Ambry Genetics

ACMG classification

Our verdict: Benign. The variant received -17 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.85).
• BP6: Variant 20-763638-G-A is Benign according to our data. Variant chr20-763638-G-A is described in ClinVar as Likely_benign. ClinVar VariationId is 476617.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BP7: Synonymous conserved (PhyloP=-0.165 with no splicing effect.
• BS1: Variant frequency is greater than expected in population sas. GnomAd4 allele frequency = 0.0000853 (13/152322) while in subpopulation SAS AF = 0.00145 (7/4832). AF 95% confidence interval is 0.000679. There are 0 homozygotes in GnomAd4. There are 7 alleles in the male GnomAd4 subpopulation. Median coverage is 33. This position passed quality control check.

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

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SLC52A3	NM_033409.4	MANE Select	c.933C>T	p.Asn311Asn	synonymous	Exon 3 of 5	NP_212134.3
	SLC52A3	NM_001370085.1		c.933C>T	p.Asn311Asn	synonymous	Exon 4 of 6	NP_001357014.1
	SLC52A3	NM_001370086.1		c.933C>T	p.Asn311Asn	synonymous	Exon 4 of 6	NP_001357015.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SLC52A3	ENST00000645534.1	MANE Select	c.933C>T	p.Asn311Asn	synonymous	Exon 3 of 5	ENSP00000494193.1
	SLC52A3	ENST00000217254.11	TSL:5	c.933C>T	p.Asn311Asn	synonymous	Exon 4 of 6	ENSP00000217254.7
	SLC52A3	ENST00000488495.3	TSL:3	c.933C>T	p.Asn311Asn	synonymous	Exon 3 of 5	ENSP00000494009.1

Frequencies

GnomAD3 genomes AF: 0.0000854 AC: 13 AN: 152204 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000327

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00145

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.000119 AC: 30 AN: 251430 AF XY: 0.000155

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000289

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: 0.000489

GnomAD4 exome AF: 0.0000780 AC: 114 AN: 1461876 Hom.: 1 Cov.: 32 AF XY: 0.000100 AC XY: 73 AN XY: 727240

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.0000894 AC: 4 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.000927 AC: 80 AN: 86258

European-Finnish (FIN) AF: 0.0000187 AC: 1 AN: 53406

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.0000180 AC: 20 AN: 1112008

Other (OTH) AF: 0.000149 AC: 9 AN: 60396

GnomAD4 genome AF: 0.0000853 AC: 13 AN: 152322 Hom.: 0 Cov.: 33 AF XY: 0.0000940 AC XY: 7 AN XY: 74486

African (AFR) AF: 0.00 AC: 0 AN: 41586

American (AMR) AF: 0.000327 AC: 5 AN: 15304

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.00 AC: 0 AN: 5184

South Asian (SAS) AF: 0.00145 AC: 7 AN: 4832

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10620

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.0000147 AC: 1 AN: 68008

Other (OTH) AF: 0.00 AC: 0 AN: 2110

Alfa AF: 0.0000564 Hom.: 0

Bravo AF: 0.0000982

Asia WGS AF: 0.00115 AC: 4 AN: 3478

ClinVar

ClinVar submissions as Germline

Significance: Likely benign

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	-	1	Brown-Vialetto-van Laere syndrome 1 (1)
-	-	1	Inborn genetic diseases (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.85
CADD	Benign	2.2
DANN	Benign	0.56
PhyloP100		-0.17
Mutation Taster		=100/0	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
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

Other links and lift over

dbSNP: rs534678154; hg19: chr20-744282; COSMIC: COSV54079265;