NM_003085.5:c.100A>G

Variant names:

• chr5-176629555-T-C
• rs2113420521
• NM_003085.5:c.100A>G

Variant summary

Our verdict is Uncertain significance. The variant received 5 ACMG points: 5P and 0B. PM2 PP2 PP3_Moderate

The NM_003085.5(SNCB):​c.100A>G​(p.Lys34Glu) 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 (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: SNCB NM_003085.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.99
• Publications: 0 publications found

Genes affected

SNCB (HGNC:11140): (synuclein beta) This gene encodes a member of a small family of proteins that inhibit phospholipase D2 and may function in neuronal plasticity. The encoded protein is abundant in lesions of patients with Alzheimer disease. A mutation in this gene was found in individuals with dementia with Lewy bodies. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Dec 2015]

MIR4281 (HGNC:38357): (microRNA 4281) microRNAs (miRNAs) are short (20-24 nt) non-coding RNAs that are involved in post-transcriptional regulation of gene expression in multicellular organisms by affecting both the stability and translation of mRNAs. miRNAs are transcribed by RNA polymerase II as part of capped and polyadenylated primary transcripts (pri-miRNAs) that can be either protein-coding or non-coding. The primary transcript is cleaved by the Drosha ribonuclease III enzyme to produce an approximately 70-nt stem-loop precursor miRNA (pre-miRNA), which is further cleaved by the cytoplasmic Dicer ribonuclease to generate the mature miRNA and antisense miRNA star (miRNA*) products. The mature miRNA is incorporated into a RNA-induced silencing complex (RISC), which recognizes target mRNAs through imperfect base pairing with the miRNA and most commonly results in translational inhibition or destabilization of the target mRNA. The RefSeq represents the predicted microRNA stem-loop. [provided by RefSeq, Sep 2009]

ACMG classification

Our verdict: Uncertain_significance. The variant received 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 1 curated pathogenic missense variants (we use a threshold of 10). The gene has 0 curated benign missense variants. Gene score misZ: 0.95189 (below the threshold of 3.09). Trascript score misZ: 1.453 (below the threshold of 3.09). GenCC associations: The gene is linked to Lewy body dementia.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.896

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_003085.5. 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
	SNCB	NM_003085.5	MANE Select	c.100A>G	p.Lys34Glu	missense	Exon 2 of 6	NP_003076.1	Q16143
	SNCB	NM_001001502.3		c.100A>G	p.Lys34Glu	missense	Exon 3 of 7	NP_001001502.1	Q16143
	SNCB	NM_001363140.2		c.100A>G	p.Lys34Glu	missense	Exon 3 of 7	NP_001350069.1	Q16143

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SNCB	ENST00000393693.7	TSL:1 MANE Select	c.100A>G	p.Lys34Glu	missense	Exon 2 of 6	ENSP00000377296.2	Q16143
	SNCB	ENST00000310112.7	TSL:1	c.100A>G	p.Lys34Glu	missense	Exon 3 of 7	ENSP00000308057.3	Q16143
	SNCB	ENST00000614675.4	TSL:1	c.100A>G	p.Lys34Glu	missense	Exon 3 of 6	ENSP00000479489.1	G4Y816

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	Lewy body dementia (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.96
BayesDel_addAF	Pathogenic	0.30	D
BayesDel_noAF	Pathogenic	0.20
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.96	D
Eigen	Uncertain	0.61
Eigen_PC	Uncertain	0.52
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.98	D
M_CAP	Pathogenic	0.32	D
MetaRNN	Pathogenic	0.90	D
MetaSVM	Uncertain	0.62	D
MutationAssessor	Uncertain	2.7	M
PhyloP100		8.0
PrimateAI	Uncertain	0.76	T
PROVEAN	Uncertain	-3.7	D
REVEL	Pathogenic	0.86
Sift	Pathogenic	0.0	D
Sift4G	Uncertain	0.0030	D
Polyphen		0.92	P
Vest4		0.87
MutPred		0.54		Loss of ubiquitination at K34 (P = 0.003)
MVP		0.94
MPC		1.0
ClinPred		1.0	D
GERP RS		3.4
PromoterAI		-0.00090	Neutral
Varity_R		0.91
gMVP		0.94
Mutation Taster		=42/58	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: rs2113420521; hg19: chr5-176056556;