rs397514657

Positions:

• chr8-144359647-C-G
• chr8-144359647-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 4P and 1B. PM2 PM5 BP4

The NM_001363118.2(SLC52A2):​c.155C>G​(p.Ser52Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. S52F) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 33)
• Consequence: SLC52A2 NM_001363118.2 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 3.12

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr8-144359647-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 40231.Status of the report is criteria_provided_single_submitter, 1 stars.
• BP4: Computational evidence support a benign effect (MetaRNN=0.332483).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SLC52A2	NM_001363118.2	c.155C>G	p.Ser52Cys	missense_variant	3/5	ENST00000643944.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SLC52A2	ENST00000643944.2	c.155C>G	p.Ser52Cys	missense_variant	3/5		NM_001363118.2	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.00000398 AC: 1 AN: 250968 Hom.: 0 AF XY: 0.00000737 AC XY: 1 AN XY: 135642

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 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 Cov.: 31

GnomAD4 genome Cov.: 33

ExAC AF: 0.00000824 AC: 1

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Benign	-0.034	T
BayesDel_noAF	Benign	-0.20
CADD	Benign	22
DANN	Benign	0.86
Eigen	Benign	-0.35
Eigen_PC	Benign	-0.32
FATHMM_MKL	Uncertain	0.83	D
M_CAP	Uncertain	0.18	D
MetaRNN	Benign	0.33	T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.61	T
MutationTaster	Benign	1.0	D;D;D;D;D;D;D
PrimateAI	Uncertain	0.63	T
PROVEAN	Uncertain	-2.6	D;D;D;D;D;D;D;.
REVEL	Benign	0.27
Sift	Benign	0.053	T;D;D;D;D;D;D;.
Sift4G	Benign	0.11	T;D;D;D;T;D;D;.
Polyphen		0.0090	.;B;B;B;.;B;B;B
Vest4		0.40
MutPred		0.52		Gain of helix (P = 0.2059);Gain of helix (P = 0.2059);Gain of helix (P = 0.2059);Gain of helix (P = 0.2059);Gain of helix (P = 0.2059);Gain of helix (P = 0.2059);Gain of helix (P = 0.2059);Gain of helix (P = 0.2059);
MVP		0.41
MPC		0.12
ClinPred		0.18	T
GERP RS		2.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.22
gMVP		0.64

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

Publications

LitVar

Other links and lift over

dbSNP: rs397514657; hg19: chr8-145583307;