3-155829719-T-G

Variant names:

Variant summary

Our verdict is Benign. The variant received -16 ACMG points: 0P and 16B. BP4_StrongBP6_Very_StrongBS2

The NM_004733.4(SLC33A1):c.1451A>C(p.Asn484Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00297 in 1,613,974 control chromosomes in the GnomAD database, including 7 homozygotes. In-silico tool predicts a benign outcome for this variant. 16/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.0018 ( 1 hom., cov: 32)

Exomes 𝑓: 0.0031 ( 6 hom. )

Consequence

SLC33A1
NM_004733.4 missense

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:9

Conservation

PhyloP100: 0.878

Publications

7 publications found

Variant links:

Genes affected

SLC33A1 (HGNC:95): (solute carrier family 33 member 1) The protein encoded by this gene is required for the formation of O-acetylated (Ac) gangliosides. The encoded protein is predicted to contain 6 to 10 transmembrane domains, and a leucine zipper motif in transmembrane domain III. Defects in this gene have been reported to cause spastic paraplegia autosomal dominant type 42 (SPG42) in one Chinese family, but not in similar patients of European descent. Two transcript variants encoding the same protein have been found for this gene. [provided by RefSeq, Jul 2010]

SLC33A1 Gene-Disease associations (from GenCC):

Huppke-Brendel syndrome
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, G2P, Labcorp Genetics (formerly Invitae)
hereditary spastic paraplegia 42
Inheritance: AD Classification: SUPPORTIVE, LIMITED Submitted by: Illumina, Orphanet

SLC33A1 links:

ENSG00000284952 (HGNC:):

ENSG00000284952 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -16 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.0067625046).

BP6

Variant 3-155829719-T-G is Benign according to our data. Variant chr3-155829719-T-G is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 343875.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS2

High Homozygotes in GnomAdExome4 at 6 AR,AD gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_004733.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
SLC33A1	NM_004733.4	MANE Select	c.1451A>C	p.Asn484Thr	missense	Exon 5 of 6	NP_004724.1
SLC33A1	NM_001190992.2		c.1451A>C	p.Asn484Thr	missense	Exon 5 of 7	NP_001177921.1
SLC33A1	NM_001363883.1		c.1145A>C	p.Asn382Thr	missense	Exon 3 of 4	NP_001350812.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
SLC33A1	ENST00000643144.2	MANE Select	c.1451A>C	p.Asn484Thr	missense	Exon 5 of 6	ENSP00000496241.1
SLC33A1	ENST00000359479.7	TSL:1	c.1451A>C	p.Asn484Thr	missense	Exon 5 of 7	ENSP00000352456.3
ENSG00000284952	ENST00000643876.1		n.*773A>C		non_coding_transcript_exon	Exon 5 of 10	ENSP00000495323.1

Frequencies

GnomAD3 genomes

AF:

0.00183

AC:

278

AN:

152102

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000797

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00157

Gnomad ASJ

AF:

0.000577

Gnomad EAS

AF:

0.000771

Gnomad SAS

AF:

0.000623

Gnomad FIN

AF:

0.0000942

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00298

Gnomad OTH

AF:

0.00383

GnomAD2 exomes

AF:

0.00175

AC:

440

AN:

251474

AF XY:

0.00176

show subpopulations

Gnomad AFR exome

AF:

0.000308

Gnomad AMR exome

AF:

0.000896

Gnomad ASJ exome

AF:

0.00149

Gnomad EAS exome

AF:

0.000217

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00302

Gnomad OTH exome

AF:

0.00163

GnomAD4 exome

AF:

0.00309

AC:

4510

AN:

1461754

Hom.:

Cov.:

AF XY:

0.00299

AC XY:

2175

AN XY:

727178

show subpopulations

African (AFR)

AF:

0.000508

AC:

AN:

33478

American (AMR)

AF:

0.00105

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00142

AC:

AN:

26132

East Asian (EAS)

AF:

0.000101

AC:

AN:

39688

South Asian (SAS)

AF:

0.00107

AC:

AN:

86254

European-Finnish (FIN)

AF:

0.000150

AC:

AN:

53418

Middle Eastern (MID)

AF:

0.000693

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00373

AC:

4152

AN:

1111900

Other (OTH)

AF:

0.00247

AC:

149

AN:

60392

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.477

Heterozygous variant carriers

218

436

655

873

1091

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

166

332

498

664

830

<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:

0.00183

AC:

278

AN:

152220

Hom.:

Cov.:

AF XY:

0.00132

AC XY:

AN XY:

74430

show subpopulations

African (AFR)

AF:

0.000795

AC:

AN:

41532

American (AMR)

AF:

0.00157

AC:

AN:

15294

Ashkenazi Jewish (ASJ)

AF:

0.000577

AC:

AN:

3466

East Asian (EAS)

AF:

0.000773

AC:

AN:

5176

South Asian (SAS)

AF:

0.000624

AC:

AN:

4808

European-Finnish (FIN)

AF:

0.0000942

AC:

AN:

10612

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00298

AC:

203

AN:

68014

Other (OTH)

AF:

0.00379

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.490

Heterozygous variant carriers

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:

0.00225

Hom.:

Bravo

AF:

0.00193

TwinsUK

AF:

0.00431

AC:

ALSPAC

AF:

0.00649

AC:

ESP6500AA

AF:

0.000681

AC:

ESP6500EA

AF:

0.00291

AC:

ExAC

AF:

0.00165

AC:

200

Asia WGS

AF:

0.000577

AC:

AN:

3478

EpiCase

AF:

0.00256

EpiControl

AF:

0.00439

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:9

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Benign:5

Laboratory of Diagnostic Genome Analysis, Leiden University Medical Center (LUMC)

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

Breakthrough Genomics, Breakthrough Genomics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:not provided

Jun 16, 2021

GeneDx

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant is associated with the following publications: (PMID: 31227335)

Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

Jul 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

SLC33A1: BP4, BS1

not specified

Benign:1

Apr 06, 2021

Athena Diagnostics

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Spastic paraplegia

Benign:1

Feb 03, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Hereditary spastic paraplegia

Benign:1

Nov 03, 2020

Genome Diagnostics Laboratory, The Hospital for Sick Children

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Hereditary spastic paraplegia 42;C4751114:Huppke-Brendel syndrome

Benign:1

Dec 08, 2021

Fulgent Genetics, Fulgent Genetics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.081

BayesDel_addAF

Benign

-0.48

BayesDel_noAF

Benign

-0.45

CADD

Benign

(source)

DANN

Benign

0.93

DEOGEN2

Benign

0.066

Eigen

Benign

-0.77

Eigen_PC

Benign

-0.52

FATHMM_MKL

Benign

0.56

LIST_S2

Benign

0.69

M_CAP

Benign

0.0077

MetaRNN

Benign

0.0068

MetaSVM

Benign

-1.0

MutationAssessor

Benign

-0.080

PhyloP100

0.88

PrimateAI

Uncertain

0.49

PROVEAN

Benign

-0.43

REVEL

Benign

0.10

Sift

Benign

0.89

Sift4G

Benign

0.77

Polyphen

0.0020

Vest4

0.20

MVP

0.61

MPC

0.39

ClinPred

0.0028

GERP RS

4.5

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.039

gMVP

0.47

Mutation Taster

=43/57

disease causing

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

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

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over