chr2-108010808-C-G

Position:

• chr2-108010808-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_021815.5(SLC5A7):​c.1690C>G​(p.Leu564Val) variant causes a missense change. 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 (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: SLC5A7 NM_021815.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.15

Genes affected

SLC5A7 (HGNC:14025): (solute carrier family 5 member 7) This gene encodes a sodium ion- and chloride ion-dependent high-affinity transporter that mediates choline uptake for acetylcholine synthesis in cholinergic neurons. The protein transports choline from the extracellular space into presynaptic terminals for synthesis into acetylcholine. Increased choline uptake results from increased density of this protein in synaptosomal plasma membranes in response to depolarization of cholinergic terminals. Dysfunction of cholinergic signaling has been implicated in various disorders including depression, attention-deficit disorder, and schizophrenia. An allelic variant of this gene is associated with autosomal dominant distal hereditary motor neuronopathy type VIIA. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jul 2015]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.08698022).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SLC5A7	NM_021815.5	c.1690C>G	p.Leu564Val	missense_variant	9/9	ENST00000264047.3	NP_068587.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SLC5A7	ENST00000264047.3	c.1690C>G	p.Leu564Val	missense_variant	9/9	1	NM_021815.5	ENSP00000264047.2
SLC5A7	ENST00000409059.5	c.1690C>G	p.Leu564Val	missense_variant	9/9	1		ENSP00000387346.1

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

Neuronopathy, distal hereditary motor, type 7A;C4310694:Congenital myasthenic syndrome 20 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Nov 16, 2017

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 valine 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. 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 SLC5A7-related disease. This variant is not present in population databases (ExAC no frequency). This sequence change replaces leucine with valine at codon 564 of the SLC5A7 protein (p.Leu564Val). The leucine residue is moderately conserved and there is a small physicochemical difference between leucine and valine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.057
BayesDel_addAF	Benign	-0.092	T
BayesDel_noAF	Benign	-0.37
CADD	Benign	17
DANN	Benign	0.94
DEOGEN2	Benign	0.14	T;T
Eigen	Benign	-0.091
Eigen_PC	Benign	0.026
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Benign	0.62	.;T
M_CAP	Benign	0.033	D
MetaRNN	Benign	0.087	T;T
MetaSVM	Uncertain	-0.11	T
MutationAssessor	Benign	1.8	L;L
PrimateAI	Benign	0.29	T
PROVEAN	Benign	0.11	N;N
REVEL	Benign	0.21
Sift	Benign	0.47	T;T
Sift4G	Benign	0.35	T;T
Polyphen		0.0	B;B
Vest4		0.070
MutPred		0.19		Loss of helix (P = 0.0376);Loss of helix (P = 0.0376);
MVP		0.76
MPC		0.037
ClinPred		0.22	T
GERP RS		5.0
Varity_R		0.039
gMVP		0.31

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: rs1553460067; hg19: chr2-108627264;