4-107895676-A-G

Variant names:

• chr4-107895676-A-G
• NM_001375905.1:c.123A>G

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 3P and 0B. PM2 PP3

The NM_001375905.1(SGMS2):​c.123A>G​(p.Lys41Lys) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: SGMS2 NM_001375905.1 synonymous
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.86
• 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 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: Splicing predictors support a deleterious effect. Scorers claiming Pathogenic: max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.

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.123A>G	p.Lys41Lys	synonymous	Exon 3 of 7	NP_001362834.1	Q8NHU3
	SGMS2	NM_001136257.2		c.123A>G	p.Lys41Lys	synonymous	Exon 2 of 6	NP_001129729.1	Q8NHU3
	SGMS2	NM_001136258.2		c.123A>G	p.Lys41Lys	synonymous	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.123A>G	p.Lys41Lys	synonymous	Exon 3 of 7	ENSP00000508566.1	Q8NHU3
	SGMS2	ENST00000359079.8	TSL:1	c.123A>G	p.Lys41Lys	synonymous	Exon 2 of 6	ENSP00000351981.4	Q8NHU3
	SGMS2	ENST00000394684.8	TSL:1	c.123A>G	p.Lys41Lys	synonymous	Exon 3 of 7	ENSP00000378176.4	Q8NHU3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

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
BayesDel_noAF	Benign	-0.63
CADD	Benign	18
DANN	Benign	0.72
PhyloP100		1.9

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.70		Details are displayed if max score is > 0.2
DS_DG_spliceai		0.70		Position offset: -5

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

Other links and lift over

hg19: chr4-108816832;