20-761032-T-TGGACAGTGCAGATTGCAGAAGGCA

Position:

• chr20-761032-T-TGGACAGTGCAGATTGCAGAAGGCA

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PM4

The NM_033409.4(SLC52A3):​c.1403_1404insTGCCTTCTGCAATCTGCACTGTCC​(p.Pro468_Ala469insAlaPheCysAsnLeuHisCysPro) variant causes a inframe insertion change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: SLC52A3 NM_033409.4 inframe_insertion
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.38

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
• PM4: Nonframeshift variant in NON repetitive region in NM_033409.4.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SLC52A3	NM_033409.4	c.1403_1404insTGCCTTCTGCAATCTGCACTGTCC	p.Pro468_Ala469insAlaPheCysAsnLeuHisCysPro	inframe_insertion	5/5	ENST00000645534.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SLC52A3	ENST00000645534.1	c.1403_1404insTGCCTTCTGCAATCTGCACTGTCC	p.Pro468_Ala469insAlaPheCysAsnLeuHisCysPro	inframe_insertion	5/5		NM_033409.4	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

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

Aug 03, 2018

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. This variant has not been reported in the literature in individuals with SLC52A3-related disease. This variant is not present in population databases (ExAC no frequency). This sequence change disrupts the translational stop signal of the SLC52A3 mRNA. It is expected to extend the SLC52A3 protein by an additional 8 amino acid residues. -

Computational scores

Source: dbNSFP v4.3

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs1599955591; hg19: chr20-741676;