4-107895701-C-G

Variant names:

• chr4-107895701-C-G
• rs1560667389
• NM_001375905.1:c.148C>G

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001375905.1(SGMS2):​c.148C>G​(p.Arg50Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,678 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. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R50Q) 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: Not reported in ClinVar
• Conservation: PhyloP100: 2.69
• 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 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.23826495).

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.148C>G	p.Arg50Gly	missense	Exon 3 of 7	NP_001362834.1	Q8NHU3
	SGMS2	NM_001136257.2		c.148C>G	p.Arg50Gly	missense	Exon 2 of 6	NP_001129729.1	Q8NHU3
	SGMS2	NM_001136258.2		c.148C>G	p.Arg50Gly	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.148C>G	p.Arg50Gly	missense	Exon 3 of 7	ENSP00000508566.1	Q8NHU3
	SGMS2	ENST00000359079.8	TSL:1	c.148C>G	p.Arg50Gly	missense	Exon 2 of 6	ENSP00000351981.4	Q8NHU3
	SGMS2	ENST00000394684.8	TSL:1	c.148C>G	p.Arg50Gly	missense	Exon 3 of 7	ENSP00000378176.4	Q8NHU3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461678 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 727132

African (AFR) AF: 0.00 AC: 0 AN: 33472

American (AMR) AF: 0.00 AC: 0 AN: 44670

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26130

East Asian (EAS) AF: 0.00 AC: 0 AN: 39666

South Asian (SAS) AF: 0.00 AC: 0 AN: 86254

European-Finnish (FIN) AF: 0.0000187 AC: 1 AN: 53412

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5766

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111924

Other (OTH) AF: 0.00 AC: 0 AN: 60384

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.20
BayesDel_addAF	Uncertain	0.077	D
BayesDel_noAF	Benign	-0.13
CADD	Benign	23
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.48	T
Eigen	Benign	-0.010
Eigen_PC	Benign	0.15
FATHMM_MKL	Uncertain	0.92	D
LIST_S2	Benign	0.85	T
M_CAP	Benign	0.018	T
MetaRNN	Benign	0.24	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Uncertain	2.2	M
PhyloP100		2.7
PrimateAI	Uncertain	0.48	T
PROVEAN	Benign	-1.1	N
REVEL	Benign	0.14
Sift	Benign	0.43	T
Sift4G	Benign	0.33	T
Polyphen		0.032	B
Vest4		0.48
MutPred		0.29		Loss of MoRF binding (P = 0.015)
MVP		0.51
MPC		0.47
ClinPred		0.68	D
GERP RS		4.8
Varity_R		0.32
gMVP		0.67
Mutation Taster		=29/71	disease causing

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

Other links and lift over

dbSNP: rs1560667389; hg19: chr4-108816857;