chr20-4867829-C-A

Position:

• chr20-4867829-C-A

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_005116.6(SLC23A2):​c.1297G>T​(p.Gly433Cys) 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. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 31)
• Consequence: SLC23A2 NM_005116.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.52

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 Likely_pathogenic. Variant got 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.986

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SLC23A2	NM_005116.6	c.1297G>T	p.Gly433Cys	missense_variant	13/17	ENST00000338244.6	NP_005107.4
SLC23A2	NM_203327.2	c.1297G>T	p.Gly433Cys	missense_variant	13/17		NP_976072.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SLC23A2	ENST00000338244.6	c.1297G>T	p.Gly433Cys	missense_variant	13/17	1	NM_005116.6	ENSP00000344322	P1
SLC23A2	ENST00000379333.5	c.1297G>T	p.Gly433Cys	missense_variant	13/17	1		ENSP00000368637	P1
SLC23A2	ENST00000423430.1	c.568G>T	p.Gly190Cys	missense_variant	5/8	5		ENSP00000396364

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 28

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jun 22, 2023

The c.1297G>T (p.G433C) alteration is located in exon 13 (coding exon 11) of the SLC23A2 gene. This alteration results from a G to T substitution at nucleotide position 1297, causing the glycine (G) at amino acid position 433 to be replaced by a cysteine (C). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Pathogenic	0.33	D
BayesDel_noAF	Pathogenic	0.23
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.43	T;T
Eigen	Pathogenic	0.69
Eigen_PC	Pathogenic	0.70
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	1.0	.;D
M_CAP	Uncertain	0.13	D
MetaRNN	Pathogenic	0.99	D;D
MetaSVM	Uncertain	0.47	D
MutationAssessor	Pathogenic	3.9	H;H
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Pathogenic	0.88	D
PROVEAN	Pathogenic	-8.7	D;D
REVEL	Pathogenic	0.70
Sift	Pathogenic	0.0	D;D
Sift4G	Pathogenic	0.0	D;D
Polyphen		1.0	D;D
Vest4		0.94
MutPred		0.97		Loss of disorder (P = 0.0351);Loss of disorder (P = 0.0351);
MVP		0.74
MPC		2.0
ClinPred		1.0	D
GERP RS		5.5
Varity_R		0.92
gMVP		0.99

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.050		Details are displayed if max score is > 0.2

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr20-4848475;