chr8-144359720-C-T

Variant names:

• chr8-144359720-C-T
• rs111588500
• NM_001363118.2:c.228C>T

Variant summary

Our verdict is Benign. The variant received -16 ACMG points: 0P and 16B. BP4_Strong BP6_Very_Strong BS1

The NM_001410949.1(SLC52A2):​c.-37C>T variant causes a 5 prime UTR premature start codon gain change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000624 in 1,613,572 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 0.00085 (0 hom., cov: 33)
  • Exomes 𝑓: 0.00060 (1 hom.)
• Consequence: SLC52A2 NM_001410949.1 5_prime_UTR_premature_start_codon_gain
• Clinical Significance: Likely benign criteria provided, multiple submitters, no conflicts B:8
• Conservation: PhyloP100: 0.0380
• Publications: 0 publications found

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

ACMG classification

Our verdict: Benign. The variant received -16 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.6).
• BP6: Variant 8-144359720-C-T is Benign according to our data. Variant chr8-144359720-C-T is described in ClinVar as Likely_benign. ClinVar VariationId is 384746.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS1: Variant frequency is greater than expected in population nfe. GnomAd4 allele frequency = 0.000854 (130/152262) while in subpopulation NFE AF = 0.0016 (109/68006). AF 95% confidence interval is 0.00136. There are 0 homozygotes in GnomAd4. There are 57 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_001410949.1. 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
	SLC52A2	NM_001363118.2	MANE Select	c.228C>T	p.Asp76Asp	synonymous	Exon 3 of 5	NP_001350047.1
	SLC52A2	NM_001410949.1		c.-37C>T		5_prime_UTR_premature_start_codon_gain	Exon 2 of 4	NP_001397878.1
	SLC52A2	NM_001253815.2		c.228C>T	p.Asp76Asp	synonymous	Exon 3 of 5	NP_001240744.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SLC52A2	ENST00000643944.2	MANE Select	c.228C>T	p.Asp76Asp	synonymous	Exon 3 of 5	ENSP00000496184.2
	SLC52A2	ENST00000329994.7	TSL:1	c.228C>T	p.Asp76Asp	synonymous	Exon 3 of 5	ENSP00000333638.2
	SLC52A2	ENST00000526891.2	TSL:4	c.-37C>T		5_prime_UTR_premature_start_codon_gain	Exon 3 of 5	ENSP00000502670.1

Frequencies

GnomAD3 genomes AF: 0.000854 AC: 130 AN: 152144 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.0000483

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000131

Gnomad ASJ AF: 0.00202

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000415

Gnomad FIN AF: 0.000659

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00160

Gnomad OTH AF: 0.000478

GnomAD2 exomes AF: 0.000713 AC: 179 AN: 251000 AF XY: 0.000781

Gnomad AFR exome AF: 0.0000616

Gnomad AMR exome AF: 0.0000578

Gnomad ASJ exome AF: 0.00298

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.000601

Gnomad NFE exome AF: 0.00112

Gnomad OTH exome AF: 0.000653

GnomAD4 exome AF: 0.000600 AC: 877 AN: 1461310 Hom.: 1 Cov.: 31 AF XY: 0.000638 AC XY: 464 AN XY: 726948

African (AFR) AF: 0.0000299 AC: 1 AN: 33480

American (AMR) AF: 0.0000894 AC: 4 AN: 44722

Ashkenazi Jewish (ASJ) AF: 0.00264 AC: 69 AN: 26136

East Asian (EAS) AF: 0.0000252 AC: 1 AN: 39700

South Asian (SAS) AF: 0.0000696 AC: 6 AN: 86258

European-Finnish (FIN) AF: 0.000719 AC: 38 AN: 52866

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5762

European-Non Finnish (NFE) AF: 0.000652 AC: 725 AN: 1112000

Other (OTH) AF: 0.000546 AC: 33 AN: 60386

GnomAD4 genome AF: 0.000854 AC: 130 AN: 152262 Hom.: 0 Cov.: 33 AF XY: 0.000766 AC XY: 57 AN XY: 74458

African (AFR) AF: 0.0000481 AC: 2 AN: 41540

American (AMR) AF: 0.000131 AC: 2 AN: 15300

Ashkenazi Jewish (ASJ) AF: 0.00202 AC: 7 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5190

South Asian (SAS) AF: 0.000415 AC: 2 AN: 4820

European-Finnish (FIN) AF: 0.000659 AC: 7 AN: 10618

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

European-Non Finnish (NFE) AF: 0.00160 AC: 109 AN: 68006

Other (OTH) AF: 0.000473 AC: 1 AN: 2112

Alfa AF: 0.00174 Hom.: 0

Bravo AF: 0.000616

EpiCase AF: 0.00104

EpiControl AF: 0.000237

ClinVar

ClinVar submissions as Germline

Significance: Likely benign

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	-	4	not provided (4)
-	-	2	not specified (2)
-	-	1	Brown-Vialetto-van Laere syndrome 2 (1)
-	-	1	Inborn genetic diseases (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.60
CADD	Benign	12
DANN	Benign	0.62
PhyloP100		0.038
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.8
Mutation Taster		=98/2	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: rs111588500; hg19: chr8-145583380; COSMIC: COSV57354105; COSMIC: COSV57354105;