2-232087662-T-C

Position:

• chr2-232087662-T-C

Variant summary

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

The NM_152383.5(DIS3L2):​c.542T>C​(p.Ile181Thr) 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: 31)
• Consequence: DIS3L2 NM_152383.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.227

Genes affected

DIS3L2 (HGNC:28648): (DIS3 like 3'-5' exoribonuclease 2) The protein encoded by this gene is similar in sequence to 3'/5' exonucleolytic subunits of the RNA exosome. The exosome is a large multimeric ribonucleotide complex responsible for degrading various RNA substrates. Several transcript variants, some protein-coding and some not, have been found for this gene. [provided by RefSeq, Mar 2012]

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=0.033980638).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DIS3L2	NM_152383.5	c.542T>C	p.Ile181Thr	missense_variant	6/21	ENST00000325385.12	NP_689596.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DIS3L2	ENST00000325385.12	c.542T>C	p.Ile181Thr	missense_variant	6/21	5	NM_152383.5	ENSP00000315569	P1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Perlman syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Mar 09, 2019

In summary, this variant is a novel missense change that is not predicted to affect protein function. There is no indication that it causes disease, but the available evidence is currently insufficient to prove that conclusively. 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. This variant is not present in population databases (ExAC no frequency) and has not been reported in the literature in individuals with a DIS3L2-related disease. This sequence change replaces isoleucine with threonine at codon 181 of the DIS3L2 protein (p.Ile181Thr). The isoleucine residue is weakly conserved and there is a moderate physicochemical difference between isoleucine and threonine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.080
BayesDel_addAF	Benign	-0.30	T
BayesDel_noAF	Benign	-0.67
CADD	Benign	0.81
DANN	Benign	0.64
DEOGEN2	Benign	0.0015	.;T;.;T
Eigen	Benign	-1.4
Eigen_PC	Benign	-1.4
FATHMM_MKL	Benign	0.036	N
LIST_S2	Benign	0.60	T;T;.;.
M_CAP	Benign	0.0051	T
MetaRNN	Benign	0.034	T;T;T;T
MetaSVM	Benign	-0.98	T
MutationAssessor	Benign	0.0	N;N;N;N
MutationTaster	Benign	1.0	N;N;N;N;N
PrimateAI	Benign	0.31	T
PROVEAN	Benign	0.56	N;N;N;N
REVEL	Benign	0.045
Sift	Benign	0.41	T;T;T;T
Sift4G	Benign	0.66	T;T;T;T
Polyphen		0.0010, 0.0080	.;B;B;B
Vest4		0.086
MutPred		0.55		Gain of disorder (P = 0.0151);Gain of disorder (P = 0.0151);Gain of disorder (P = 0.0151);Gain of disorder (P = 0.0151);
MVP		0.043
MPC		0.28
ClinPred		0.026	T
GERP RS		-4.3
Varity_R		0.028
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: rs1060503029; hg19: chr2-232952372;