chr3-155853328-C-G

Variant names:

• chr3-155853328-C-G
• rs1553778986
• NM_004733.4:c.670G>C

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_004733.4(SLC33A1):​c.670G>C​(p.Gly224Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic 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. G224V) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: SLC33A1 NM_004733.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.39
• Publications: 0 publications found

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

ENSG00000284952 (HGNC:):

ACMG classification

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.987

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SLC33A1	NM_004733.4	c.670G>C	p.Gly224Arg	missense_variant	Exon 1 of 6	ENST00000643144.2	NP_004724.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SLC33A1	ENST00000643144.2	c.670G>C	p.Gly224Arg	missense_variant	Exon 1 of 6		NM_004733.4	ENSP00000496241.1
ENSG00000284952	ENST00000643876.1	n.670G>C		non_coding_transcript_exon_variant	Exon 1 of 10			ENSP00000495323.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Jun 06, 2017

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.48	D
BayesDel_noAF	Pathogenic	0.45
CADD	Pathogenic	32
DANN	Pathogenic	1.0
DEOGEN2	Pathogenic	0.82	D;D;D;.
Eigen	Pathogenic	0.91
Eigen_PC	Pathogenic	0.85
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Uncertain	0.96	.;.;D;D
M_CAP	Uncertain	0.21	D
MetaRNN	Pathogenic	0.99	D;D;D;D
MetaSVM	Pathogenic	0.93	D
MutationAssessor	Pathogenic	3.5	H;H;H;.
PhyloP100		7.4
PrimateAI	Pathogenic	0.95	D
PROVEAN	Pathogenic	-7.8	D;.;D;.
REVEL	Pathogenic	0.90
Sift	Pathogenic	0.0	D;.;D;.
Sift4G	Uncertain	0.0020	D;.;D;.
Polyphen		1.0	D;D;D;.
Vest4		0.99
MutPred		0.95		Gain of methylation at G224 (P = 0.0135);Gain of methylation at G224 (P = 0.0135);Gain of methylation at G224 (P = 0.0135);Gain of methylation at G224 (P = 0.0135);
MVP		0.98
MPC		2.4
ClinPred		1.0	D
GERP RS		5.3
PromoterAI		-0.00020	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.95
gMVP		0.99
Mutation Taster		=26/74	disease causing

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: rs1553778986; hg19: chr3-155571117;