20-761203-A-C

Position:

• chr20-761203-A-C

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_033409.4(SLC52A3):​c.1233T>G​(p.Ser411Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000284 in 1,406,300 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another nucleotide change resulting in the same amino acid substitution has been previously reported as Likely benign in UniProt. Synonymous variant affecting the same amino acid position (i.e. S411S) has been classified as Benign.

• Frequency:
  • Genomes: not found (cov: 35)
  • Exomes 𝑓: 0.0000028 (0 hom.)
• Consequence: SLC52A3 NM_033409.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.24

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.888

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SLC52A3	NM_033409.4	c.1233T>G	p.Ser411Arg	missense_variant	5/5	ENST00000645534.1	NP_212134.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SLC52A3	ENST00000645534.1	c.1233T>G	p.Ser411Arg	missense_variant	5/5		NM_033409.4	ENSP00000494193.1

Frequencies

GnomAD3 genomes Cov.: 35

GnomAD3 exomes AF: 0.0000121 AC: 2 AN: 165046 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 88944

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000769

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000284 AC: 4 AN: 1406300 Hom.: 0 Cov.: 77 AF XY: 0.00 AC XY: 0 AN XY: 694428

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.000108

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 35

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Brown-Vialetto-van Laere syndrome 1 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jul 23, 2024

This sequence change replaces serine, which is neutral and polar, with arginine, which is basic and polar, at codon 411 of the SLC52A3 protein (p.Ser411Arg). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with SLC52A3-related conditions. ClinVar contains an entry for this variant (Variation ID: 1463783). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt SLC52A3 protein function with a negative predictive value of 80%. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. 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	Pathogenic	0.92
BayesDel_addAF	Pathogenic	0.33	D
BayesDel_noAF	Pathogenic	0.24
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Benign	0.24	T;T;T;T
Eigen	Uncertain	0.46
Eigen_PC	Uncertain	0.37
FATHMM_MKL	Uncertain	0.78	D
LIST_S2	Uncertain	0.93	.;.;.;D
M_CAP	Pathogenic	0.30	D
MetaRNN	Pathogenic	0.89	D;D;D;D
MetaSVM	Uncertain	0.48	D
MutationAssessor	Pathogenic	3.2	M;M;M;M
PrimateAI	Uncertain	0.58	T
PROVEAN	Uncertain	-4.1	.;.;D;.
REVEL	Pathogenic	0.77
Sift	Uncertain	0.0020	.;.;D;.
Sift4G	Uncertain	0.0020	.;D;D;.
Polyphen		1.0	D;D;D;D
Vest4		0.86, 0.86
MutPred		0.63		Gain of MoRF binding (P = 0.012);Gain of MoRF binding (P = 0.012);Gain of MoRF binding (P = 0.012);Gain of MoRF binding (P = 0.012);
MVP		0.79
MPC		0.53
ClinPred		0.99	D
GERP RS		4.3
Varity_R		0.62
gMVP		0.95

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.24		Details are displayed if max score is > 0.2
DS_DG_spliceai		0.24		Position offset: 1

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs910857; hg19: chr20-741847;