chr4-107895570-C-G

Variant names:

• chr4-107895570-C-G
• NM_001375905.1:c.17C>G

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_001375905.1(SGMS2):​c.17C>G​(p.Thr6Arg) variant causes a missense change. The variant allele was found at a frequency of 0.000000684 in 1,461,210 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. T6I) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: SGMS2 NM_001375905.1 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 6.33
• Publications: 0 publications found

Genes affected

SGMS2 (HGNC:28395): (sphingomyelin synthase 2) Sphingomyelin, a major component of cell and Golgi membranes, is made by the transfer of phosphocholine from phosphatidylcholine onto ceramide, with diacylglycerol as a side product. The protein encoded by this gene is an enzyme that catalyzes this reaction primarily at the cell membrane. The synthesis is reversible, and this enzyme can catalyze the reaction in either direction. The encoded protein is required for cell growth. Three transcript variants encoding the same protein have been found for this gene. There is evidence for more variants, but the full-length nature of their transcripts has not been determined.[provided by RefSeq, Oct 2008]

CYP2U1-AS1 (HGNC:54817): (CYP2U1 and SGMS2 antisense RNA 1)

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001375905.1. 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
	SGMS2	NM_001375905.1	MANE Select	c.17C>G	p.Thr6Arg	missense	Exon 3 of 7	NP_001362834.1	Q8NHU3
	SGMS2	NM_001136257.2		c.17C>G	p.Thr6Arg	missense	Exon 2 of 6	NP_001129729.1	Q8NHU3
	SGMS2	NM_001136258.2		c.17C>G	p.Thr6Arg	missense	Exon 3 of 7	NP_001129730.1	Q8NHU3

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SGMS2	ENST00000690982.1	MANE Select	c.17C>G	p.Thr6Arg	missense	Exon 3 of 7	ENSP00000508566.1	Q8NHU3
	SGMS2	ENST00000359079.8	TSL:1	c.17C>G	p.Thr6Arg	missense	Exon 2 of 6	ENSP00000351981.4	Q8NHU3
	SGMS2	ENST00000394684.8	TSL:1	c.17C>G	p.Thr6Arg	missense	Exon 3 of 7	ENSP00000378176.4	Q8NHU3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461210 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 726870

African (AFR) AF: 0.00 AC: 0 AN: 33430

American (AMR) AF: 0.00 AC: 0 AN: 44664

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26078

East Asian (EAS) AF: 0.00 AC: 0 AN: 39688

South Asian (SAS) AF: 0.00 AC: 0 AN: 86190

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53384

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5758

European-Non Finnish (NFE) AF: 9.00e-7 AC: 1 AN: 1111660

Other (OTH) AF: 0.00 AC: 0 AN: 60358

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	not provided (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.21
BayesDel_addAF	Pathogenic	0.21	D
BayesDel_noAF	Uncertain	0.060
CADD	Uncertain	23
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.47	T
Eigen	Uncertain	0.57
Eigen_PC	Uncertain	0.64
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Benign	0.78	T
M_CAP	Benign	0.049	D
MetaRNN	Uncertain	0.54	D
MetaSVM	Benign	-0.45	T
MutationAssessor	Uncertain	2.2	M
PhyloP100		6.3
PrimateAI	Uncertain	0.70	T
PROVEAN	Benign	-1.1	N
REVEL	Benign	0.28
Sift	Uncertain	0.0030	D
Sift4G	Uncertain	0.0050	D
Polyphen		0.98	D
Vest4		0.76
MutPred		0.27		Gain of solvent accessibility (P = 0.0171)
MVP		0.71
MPC		0.96
ClinPred		0.99	D
GERP RS		6.0
Varity_R		0.26
gMVP		0.69
Mutation Taster		=64/36	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

hg19: chr4-108816726;