chr17-6686227-C-T

Position:

• chr17-6686227-C-T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_177550.5(SLC13A5):​c.1687G>A​(p.Val563Met) 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. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. V563V) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: SLC13A5 NM_177550.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.268

Genes affected

SLC13A5 (HGNC:23089): (solute carrier family 13 member 5) This gene encodes a protein belonging to the solute carrier family 13 group of proteins. This family member is a sodium-dependent citrate cotransporter that may regulate metabolic processes. Mutations in this gene cause early infantile epileptic encephalopathy 25. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Aug 2014]

(HGNC:):

C17orf100 (HGNC:34494): (chromosome 17 open reading frame 100)

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.032445133).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SLC13A5	NM_177550.5	c.1687G>A	p.Val563Met	missense_variant	12/12	ENST00000433363.7
SLC13A5	NM_001284509.2	c.1636G>A	p.Val546Met	missense_variant	12/12
SLC13A5	NM_001284510.2	c.1558G>A	p.Val520Met	missense_variant	11/11
SLC13A5	NM_001143838.3	c.1549G>A	p.Val517Met	missense_variant	11/11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SLC13A5	ENST00000433363.7	c.1687G>A	p.Val563Met	missense_variant	12/12	1	NM_177550.5	P1
	ENST00000634558.1	n.511-3649C>T		intron_variant, non_coding_transcript_variant		5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Developmental and epileptic encephalopathy, 25 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Dec 04, 2020

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. Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The methionine amino acid residue is found in multiple mammalian species, suggesting that this missense change does not adversely affect protein function. These predictions have not been confirmed by published functional studies and their clinical significance is uncertain. This variant has not been reported in the literature in individuals with SLC13A5-related conditions. This variant is not present in population databases (ExAC no frequency). This sequence change replaces valine with methionine at codon 563 of the SLC13A5 protein (p.Val563Met). The valine residue is weakly conserved and there is a small physicochemical difference between valine and methionine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.096
BayesDel_addAF	Benign	-0.33	T
BayesDel_noAF	Benign	-0.71
CADD	Benign	10
DANN	Benign	0.90
DEOGEN2	Benign	0.11	T;.;.;.
Eigen	Benign	-0.59
Eigen_PC	Benign	-0.57
FATHMM_MKL	Benign	0.12	N
LIST_S2	Benign	0.77	T;T;T;T
M_CAP	Benign	0.0084	T
MetaRNN	Benign	0.032	T;T;T;T
MetaSVM	Benign	-0.94	T
MutationAssessor	Benign	1.8	L;.;.;.
MutationTaster	Benign	1.0	N;N;N;N
PrimateAI	Benign	0.32	T
PROVEAN	Benign	-0.26	.;.;N;.
REVEL	Benign	0.093
Sift	Benign	0.46	.;.;T;.
Sift4G	Benign	0.25	T;T;T;T
Polyphen		0.066	B;.;.;.
Vest4		0.042
MutPred		0.25		Gain of disorder (P = 0.0544);.;.;.;
MVP		0.11
MPC		0.28
ClinPred		0.081	T
GERP RS		0.51
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.030
gMVP		0.46

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: rs1973247421; hg19: chr17-6589546;