chr2-107988191-C-G

Variant names:

• chr2-107988191-C-G
• rs181681884
• NM_021815.5:c.36C>G

Variant summary

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

The NM_001305007.3(SLC5A7):​c.-669C>G variant causes a 5 prime UTR premature start codon gain change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,736 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: SLC5A7 NM_001305007.3 5_prime_UTR_premature_start_codon_gain
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.0750
• Publications: 0 publications found

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]

SLC5A7 Gene-Disease associations (from GenCC):

• neuronopathy, distal hereditary motor, type 7A

  Inheritance: AD, AR Classification: STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, ClinGen, PanelApp Australia
• congenital myasthenic syndrome 20

  Inheritance: AR Classification: STRONG Submitted by: G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae), Genomics England PanelApp
• distal hereditary motor neuropathy type 7

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• 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=0.27631497).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001305007.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SLC5A7	NM_021815.5	MANE Select	c.36C>G	p.Ile12Met	missense	Exon 2 of 9	NP_068587.1	Q9GZV3
	SLC5A7	NM_001305007.3		c.-669C>G		5_prime_UTR_premature_start_codon_gain	Exon 2 of 9	NP_001291936.1	Q2T9H3
	SLC5A7	NM_001305005.3		c.36C>G	p.Ile12Met	missense	Exon 2 of 9	NP_001291934.1	Q9GZV3

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SLC5A7	ENST00000264047.3	TSL:1 MANE Select	c.36C>G	p.Ile12Met	missense	Exon 2 of 9	ENSP00000264047.2	Q9GZV3
	SLC5A7	ENST00000409059.5	TSL:1	c.36C>G	p.Ile12Met	missense	Exon 2 of 9	ENSP00000387346.1	Q9GZV3
	SLC5A7	ENST00000950055.1		c.36C>G	p.Ile12Met	missense	Exon 2 of 8	ENSP00000620114.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461736 Hom.: 0 Cov.: 30 AF XY: 0.00000138 AC XY: 1 AN XY: 727176

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44720

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26128

East Asian (EAS) AF: 0.0000504 AC: 2 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86234

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53410

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111904

Other (OTH) AF: 0.00 AC: 0 AN: 60392

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.087
BayesDel_addAF	Uncertain	0.071	D
BayesDel_noAF	Benign	-0.14
CADD	Benign	18
DANN	Uncertain	0.99
DEOGEN2	Benign	0.34	T
Eigen	Benign	-0.23
Eigen_PC	Benign	-0.17
FATHMM_MKL	Benign	0.74	D
LIST_S2	Benign	0.85	T
M_CAP	Benign	0.056	D
MetaRNN	Benign	0.28	T
MetaSVM	Uncertain	-0.12	T
MutationAssessor	Uncertain	2.2	M
PhyloP100		0.075
PrimateAI	Benign	0.38	T
PROVEAN	Benign	-1.9	N
REVEL	Uncertain	0.36
Sift	Uncertain	0.0080	D
Sift4G	Uncertain	0.055	T
Polyphen		0.17	B
Vest4		0.40
MutPred		0.36		Loss of catalytic residue at L17 (P = 0.0428)
MVP		0.57
MPC		0.99
ClinPred		0.77	D
GERP RS		0.091
Varity_R		0.18
gMVP		0.72
Mutation Taster		=90/10	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: rs181681884; hg19: chr2-108604647;