3-47083880-C-G

Variant names:

• chr3-47083880-C-G
• rs143991928
• NM_014159.7:c.5900G>C

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_014159.7(SETD2):​c.5900G>C​(p.Gly1967Ala) variant causes a missense 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. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: SETD2 NM_014159.7 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.84

Genes affected

SETD2 (HGNC:18420): (SET domain containing 2, histone lysine methyltransferase) Huntington's disease (HD), a neurodegenerative disorder characterized by loss of striatal neurons, is caused by an expansion of a polyglutamine tract in the HD protein huntingtin. This gene encodes a protein belonging to a class of huntingtin interacting proteins characterized by WW motifs. This protein is a histone methyltransferase that is specific for lysine-36 of histone H3, and methylation of this residue is associated with active chromatin. This protein also contains a novel transcriptional activation domain and has been found associated with hyperphosphorylated RNA polymerase II. [provided by RefSeq, Aug 2008]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.06433463).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SETD2	NM_014159.7	c.5900G>C	p.Gly1967Ala	missense_variant	Exon 12 of 21	ENST00000409792.4	NP_054878.5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SETD2	ENST00000409792.4	c.5900G>C	p.Gly1967Ala	missense_variant	Exon 12 of 21	5	NM_014159.7	ENSP00000386759.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Luscan-Lumish syndrome Uncertain:1

Jan 28, 2020

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant has not been reported in the literature in individuals with SETD2-related disease. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. This variant is not present in population databases (ExAC no frequency). This sequence change replaces glycine with alanine at codon 1967 of the SETD2 protein (p.Gly1967Ala). The glycine residue is moderately conserved and there is a small physicochemical difference between glycine and alanine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.10
BayesDel_addAF	Benign	-0.26	T
BayesDel_noAF	Benign	-0.61
CADD	Benign	8.9
DANN	Benign	0.97
DEOGEN2	Benign	0.080	T;.
Eigen	Benign	-0.47
Eigen_PC	Benign	-0.42
FATHMM_MKL	Benign	0.39	N
LIST_S2	Benign	0.76	T;T
M_CAP	Benign	0.0034	T
MetaRNN	Benign	0.064	T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	0.90	L;.
PrimateAI	Benign	0.31	T
PROVEAN	Benign	-0.84	N;.
REVEL	Benign	0.052
Sift	Benign	0.15	T;.
Sift4G	Benign	0.21	T;.
Polyphen		0.0090	B;.
Vest4		0.13
MutPred		0.045		Gain of glycosylation at T1968 (P = 0.0157);.;
MVP		0.20
MPC		0.65
ClinPred		0.18	T
GERP RS		4.4
Varity_R		0.049
gMVP		0.13

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

Publications

LitVar

Other links and lift over

dbSNP: rs143991928; hg19: chr3-47125370;