Genetic Variant NM_021815.5:c.826C>T (chr2-108006133-C-T) – ACMG Classification: Benign (-19 pts)

Variant summary

Our verdict is Benign. The variant received -19 ACMG points: 0P and 19B. BP4_ModerateBP6_Very_StrongBP7BS1BS2

The NM_021815.5(SLC5A7):c.826C>T(p.Leu276Leu) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000573 in 1,614,122 control chromosomes in the GnomAD database, including 3 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.0030 ( 2 hom., cov: 32)

Exomes 𝑓: 0.00032 ( 1 hom. )

Consequence

SLC5A7
NM_021815.5 synonymous

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:6

Conservation

PhyloP100: 2.19

Publications

1 publications found

Variant links:

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

SLC5A7 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -19 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.29).

BP6

Variant 2-108006133-C-T is Benign according to our data. Variant chr2-108006133-C-T is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 532821.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BP7

Synonymous conserved (PhyloP=2.19 with no splicing effect.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.00305 (464/152262) while in subpopulation AFR AF = 0.0104 (432/41548). AF 95% confidence interval is 0.00959. There are 2 homozygotes in GnomAd4. There are 223 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High Homozygotes in GnomAd4 at 2 AD,AR gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_021815.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
SLC5A7	NM_021815.5	MANE Select	c.826C>T	p.Leu276Leu	synonymous	Exon 7 of 9	NP_068587.1	Q9GZV3
SLC5A7	NM_001305005.3		c.826C>T	p.Leu276Leu	synonymous	Exon 7 of 9	NP_001291934.1	Q9GZV3
SLC5A7	NM_001305006.3		c.511C>T	p.Leu171Leu	synonymous	Exon 6 of 8	NP_001291935.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
SLC5A7	ENST00000264047.3	TSL:1 MANE Select	c.826C>T	p.Leu276Leu	synonymous	Exon 7 of 9	ENSP00000264047.2	Q9GZV3
SLC5A7	ENST00000409059.5	TSL:1	c.826C>T	p.Leu276Leu	synonymous	Exon 7 of 9	ENSP00000387346.1	Q9GZV3
SLC5A7	ENST00000950055.1		c.712C>T	p.Leu238Leu	synonymous	Exon 6 of 8	ENSP00000620114.1

Frequencies

GnomAD3 genomes

AF:

0.00305

AC:

464

AN:

152144

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0104

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00183

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:

0.0000588

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000779

AC:

196

AN:

251458

AF XY:

0.000530

show subpopulations

Gnomad AFR exome

AF:

0.0106

Gnomad AMR exome

AF:

0.000347

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000791

Gnomad OTH exome

AF:

0.000489

GnomAD4 exome

AF:

0.000315

AC:

461

AN:

1461860

Hom.:

Cov.:

AF XY:

0.000265

AC XY:

193

AN XY:

727232

show subpopulations

African (AFR)

AF:

0.0111

AC:

372

AN:

33476

American (AMR)

AF:

0.000559

AC:

AN:

44720

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26134

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.00

AC:

AN:

86256

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53420

Middle Eastern (MID)

AF:

0.000347

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.0000252

AC:

AN:

1111992

Other (OTH)

AF:

0.000563

AC:

AN:

60394

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.484

Heterozygous variant carriers

114

143

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

100

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00305

AC:

464

AN:

152262

Hom.:

Cov.:

AF XY:

0.00300

AC XY:

223

AN XY:

74444

show subpopulations

African (AFR)

AF:

0.0104

AC:

432

AN:

41548

American (AMR)

AF:

0.00183

AC:

AN:

15300

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5164

South Asian (SAS)

AF:

0.00

AC:

AN:

4828

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10618

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000588

AC:

AN:

68014

Other (OTH)

AF:

0.00

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.507

Heterozygous variant carriers

102

127

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00117

Hom.:

Bravo

AF:

0.00354

Asia WGS

AF:

0.000577

AC:

AN:

3478

EpiCase

AF:

0.000109

EpiControl

AF:

0.0000593

ClinVar

ClinVar submissions

Significance:Benign/Likely benign

Revision:criteria provided, multiple submitters, no conflicts

View on ClinVar

Pathogenic

VUS

Benign

Condition

not provided (3)

Inborn genetic diseases (1)

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

SLC5A7-related disorder (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.29

CADD

Benign

(source)

DANN

Benign

0.81

PhyloP100

2.2

Mutation Taster

=99/1

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.11

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over