20-4869993-A-C

Variant names:

• chr20-4869993-A-C
• rs1218462189
• NM_005116.6:c.1163T>G

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_005116.6(SLC23A2):​c.1163T>G​(p.Val388Gly) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic 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. V388D) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 31)
• Consequence: SLC23A2 NM_005116.6 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 9.32

Genes affected

SLC23A2 (HGNC:10973): (solute carrier family 23 member 2) The absorption of vitamin C into the body and its distribution to organs requires two sodium-dependent vitamin C transporters. This gene encodes one of the two required transporters and the encoded protein accounts for tissue-specific uptake of vitamin C. Previously, this gene had an official symbol of SLC23A1. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.766

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SLC23A2	NM_005116.6	c.1163T>G	p.Val388Gly	missense_variant	Exon 12 of 17	ENST00000338244.6	NP_005107.4
SLC23A2	NM_203327.2	c.1163T>G	p.Val388Gly	missense_variant	Exon 12 of 17		NP_976072.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SLC23A2	ENST00000338244.6	c.1163T>G	p.Val388Gly	missense_variant	Exon 12 of 17	1	NM_005116.6	ENSP00000344322.1
SLC23A2	ENST00000379333.5	c.1163T>G	p.Val388Gly	missense_variant	Exon 12 of 17	1		ENSP00000368637.1
SLC23A2	ENST00000468355.5	n.1529T>G		non_coding_transcript_exon_variant	Exon 12 of 12	1
SLC23A2	ENST00000423430.1	c.431T>G	p.Val144Gly	missense_variant	Exon 4 of 8	5		ENSP00000396364.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 31

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.48
BayesDel_addAF	Pathogenic	0.24	D
BayesDel_noAF	Uncertain	0.11
CADD	Uncertain	25
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.42	T;T
Eigen	Uncertain	0.48
Eigen_PC	Uncertain	0.41
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.81	.;T
M_CAP	Benign	0.076	D
MetaRNN	Pathogenic	0.77	D;D
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.7	L;L
PrimateAI	Uncertain	0.76	T
PROVEAN	Pathogenic	-5.6	D;D
REVEL	Uncertain	0.59
Sift	Uncertain	0.0010	D;D
Sift4G	Pathogenic	0.0010	D;D
Polyphen		0.90	P;P
Vest4		0.63
MutPred		0.59		Loss of stability (P = 0.0435);Loss of stability (P = 0.0435);
MVP		0.65
MPC		2.2
ClinPred		1.0	D
GERP RS		5.5
Varity_R		0.78
gMVP		0.93

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: rs1218462189; hg19: chr20-4850639;