20-46049668-G-T

Position:

• chr20-46049668-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 3P and 2B. PM2 PP2 BP4_Moderate

The NM_020708.5(SLC12A5):​c.2059G>T​(p.Val687Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000688 in 1,454,218 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: SLC12A5 NM_020708.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.96

Genes affected

SLC12A5 (HGNC:13818): (solute carrier family 12 member 5) K-Cl cotransporters are proteins that lower intracellular chloride concentrations below the electrochemical equilibrium potential. The protein encoded by this gene is an integral membrane K-Cl cotransporter that can function in either a net efflux or influx pathway, depending on the chemical concentration gradients of potassium and chloride. The encoded protein can act as a homomultimer, or as a heteromultimer with other K-Cl cotransporters, to maintain chloride homeostasis in neurons. Alternative splicing results in two transcript variants encoding different isoforms. [provided by RefSeq, Sep 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), SLC12A5. . Gene score misZ 4.7022 (greater than the threshold 3.09). Trascript score misZ 6.2616 (greater than threshold 3.09). GenCC has associacion of gene with developmental and epileptic encephalopathy, 34, malignant migrating partial seizures of infancy, developmental and epileptic encephalopathy, epilepsy, idiopathic generalized, susceptibility to, 14.
• BP4: Computational evidence support a benign effect (MetaRNN=0.18292663).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SLC12A5	NM_020708.5	c.2059G>T	p.Val687Leu	missense_variant	17/26	ENST00000243964.7
SLC12A5	NM_001134771.2	c.2128G>T	p.Val710Leu	missense_variant	17/26

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SLC12A5	ENST00000243964.7	c.2059G>T	p.Val687Leu	missense_variant	17/26	1	NM_020708.5	A1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000424 AC: 1 AN: 235686 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 126850

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000304

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 6.88e-7 AC: 1 AN: 1454218 Hom.: 0 Cov.: 29 AF XY: 0.00 AC XY: 0 AN XY: 722498

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000230

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Developmental and epileptic encephalopathy, 34 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Mar 04, 2017

This sequence change replaces valine with leucine at codon 687 of the SLC12A5 protein (p.Val687Leu). The valine residue is moderately conserved and there is a small physicochemical difference between valine and leucine. This variant is not present in population databases (ExAC no frequency) and has not been reported in the literature in individuals with a SLC12A5-related disease. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies. In summary, this variant is a novel missense change that is not predicted to affect protein function. There is no indication that it causes disease, but the available evidence is currently insufficient to prove that conclusively. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.13
BayesDel_addAF	Benign	-0.015	T
BayesDel_noAF	Benign	-0.26
CADD	Benign	22
DANN	Uncertain	0.99
DEOGEN2	Benign	0.079	T;.
Eigen	Benign	-0.30
Eigen_PC	Benign	-0.099
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.97	D;D
M_CAP	Benign	0.061	D
MetaRNN	Benign	0.18	T;T
MetaSVM	Benign	-0.31	T
MutationAssessor	Benign	0.46	N;.
MutationTaster	Benign	0.98	D;D
PrimateAI	Uncertain	0.64	T
PROVEAN	Benign	-0.50	N;N
REVEL	Benign	0.24
Sift	Benign	0.073	T;T
Sift4G	Benign	0.14	T;T
Polyphen		0.0010	B;B
Vest4		0.21
MutPred		0.35		Loss of loop (P = 0.2897);.;
MVP		0.47
MPC		0.99
ClinPred		0.28	T
GERP RS		4.3
Varity_R		0.22
gMVP		0.55

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		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: rs1175869873; hg19: chr20-44678307;