rs955025798

Variant names:

• chr10-49610915-G-A
• rs955025798
• NM_003055.3:c.175G>A

Your query was ambiguous. Multiple possible variants found:

• chr10-49610915-G-A
• chr10-49610915-G-C

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2 BP4

The NM_003055.3(SLC18A3):​c.175G>A​(p.Asp59Asn) variant causes a missense change. The variant allele was found at a frequency of 0.0000197 in 152,200 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D59E) has been classified as Uncertain significance.

• Frequency: Genomes: 𝑓 0.000020 (0 hom., cov: 34)
• Consequence: SLC18A3 NM_003055.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.36
• Publications: 1 publications found

Genes affected

SLC18A3 (HGNC:10936): (solute carrier family 18 member A3) This gene is a member of the vesicular amine transporter family. The encoded transmembrane protein transports acetylcholine into secretory vesicles for release into the extracellular space. Acetylcholine transport utilizes a proton gradient established by a vacuolar ATPase. This gene is located within the first intron of the choline acetyltransferase gene. [provided by RefSeq, Jul 2008]

CHAT (HGNC:1912): (choline O-acetyltransferase) This gene encodes an enzyme which catalyzes the biosynthesis of the neurotransmitter acetylcholine. This gene product is a characteristic feature of cholinergic neurons, and changes in these neurons may explain some of the symptoms of Alzheimer's disease. Polymorphisms in this gene have been associated with Alzheimer's disease and mild cognitive impairment. Mutations in this gene are associated with congenital myasthenic syndrome associated with episodic apnea. Multiple transcript variants encoding different isoforms have been found for this gene, and some of these variants have been shown to encode more than one isoform. [provided by RefSeq, May 2010]

CHAT Gene-Disease associations (from GenCC):

• congenital myasthenic syndrome 6

  Inheritance: AR Classification: STRONG Submitted by: PanelApp Australia, Labcorp Genetics (formerly Invitae), Genomics England PanelApp
• presynaptic congenital myasthenic syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.39296234).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SLC18A3	NM_003055.3	c.175G>A	p.Asp59Asn	missense_variant	Exon 1 of 1	ENST00000374115.5	NP_003046.2
CHAT	NM_020984.4	c.-69+1716G>A		intron_variant	Intron 1 of 14		NP_066264.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SLC18A3	ENST00000374115.5	c.175G>A	p.Asp59Asn	missense_variant	Exon 1 of 1	6	NM_003055.3	ENSP00000363229.3
CHAT	ENST00000339797.5	c.-69+1716G>A		intron_variant	Intron 1 of 14	1		ENSP00000343486.1

Frequencies

GnomAD3 genomes AF: 0.0000197 AC: 3 AN: 152200 Hom.: 0 Cov.: 34

Gnomad AFR AF: 0.0000482

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.00

GnomAD4 exome Cov.: 80

GnomAD4 genome AF: 0.0000197 AC: 3 AN: 152200 Hom.: 0 Cov.: 34 AF XY: 0.0000134 AC XY: 1 AN XY: 74362

African (AFR) AF: 0.0000482 AC: 2 AN: 41470

American (AMR) AF: 0.00 AC: 0 AN: 15288

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.00 AC: 0 AN: 5166

South Asian (SAS) AF: 0.00 AC: 0 AN: 4834

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10626

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.0000147 AC: 1 AN: 68024

Other (OTH) AF: 0.00 AC: 0 AN: 2092

Alfa AF: 0.0000660 Hom.: 0

Bravo AF: 0.00000756

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Uncertain:1

May 18, 2022

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.175G>A (p.D59N) alteration is located in exon 1 (coding exon 1) of the SLC18A3 gene. This alteration results from a G to A substitution at nucleotide position 175, causing the aspartic acid (D) at amino acid position 59 to be replaced by an asparagine (N). 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	Benign	0.17
BayesDel_addAF	Benign	-0.11	T
BayesDel_noAF	Benign	-0.40
CADD	Benign	21
DANN	Uncertain	0.99
DEOGEN2	Benign	0.39	T
Eigen	Benign	-0.30
Eigen_PC	Benign	-0.18
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Benign	0.83	T
M_CAP	Benign	0.047	D
MetaRNN	Benign	0.39	T
MetaSVM	Benign	-0.73	T
MutationAssessor	Benign	1.5	L
PhyloP100		4.4
PrimateAI	Uncertain	0.64	T
PROVEAN	Uncertain	-2.4	N
REVEL	Benign	0.23
Sift	Benign	0.23	T
Sift4G	Benign	0.34	T
Polyphen		0.041	B
Vest4		0.37
MutPred		0.66		Loss of helix (P = 0.2022);
MVP		0.67
ClinPred		0.73	D
GERP RS		1.9
Varity_R		0.11
gMVP		0.67
Mutation Taster		=83/17	polymorphism

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

Other links and lift over

dbSNP: rs955025798; hg19: chr10-50818961;