chr2-232238622-A-G

Position:

• chr2-232238622-A-G

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_152383.5(DIS3L2):​c.1294A>G​(p.Thr432Ala) 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 (★). Synonymous variant affecting the same amino acid position (i.e. T432T) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: DIS3L2 NM_152383.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 8.65

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_pathogenic. Variant got 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.964

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
DIS3L2	NM_152383.5	c.1294A>G	p.Thr432Ala	missense_variant	11/21	ENST00000325385.12
DIS3L2	NM_001257281.2	c.1294A>G	p.Thr432Ala	missense_variant	11/14
DIS3L2	NR_046476.2	n.1440A>G		non_coding_transcript_exon_variant	11/21
DIS3L2	NR_046477.2	n.1416A>G		non_coding_transcript_exon_variant	10/19

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DIS3L2	ENST00000325385.12	c.1294A>G	p.Thr432Ala	missense_variant	11/21	5	NM_152383.5	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 33

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

Invitae

Nov 16, 2019

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 do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals with DIS3L2-related disease. ClinVar contains an entry for this variant (Variation ID: 463056). This variant is not present in population databases (ExAC no frequency). This sequence change replaces threonine with alanine at codon 432 of the DIS3L2 protein (p.Thr432Ala). The threonine residue is highly conserved and there is a small physicochemical difference between threonine and alanine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.56
BayesDel_addAF	Pathogenic	0.29	D
BayesDel_noAF	Pathogenic	0.18
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Benign	0.34	.;T;T;T
Eigen	Pathogenic	0.98
Eigen_PC	Pathogenic	0.87
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.99	D;D;.;D
M_CAP	Benign	0.075	D
MetaRNN	Pathogenic	0.96	D;D;D;D
MetaSVM	Uncertain	0.15	D
MutationAssessor	Pathogenic	3.2	M;M;M;.
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Uncertain	0.55	T
PROVEAN	Uncertain	-4.3	D;D;D;D
REVEL	Pathogenic	0.73
Sift	Uncertain	0.0040	D;D;D;D
Sift4G	Uncertain	0.011	D;D;D;D
Polyphen		1.0	.;D;D;.
Vest4		0.93
MutPred		0.89		Loss of phosphorylation at T432 (P = 0.0773);Loss of phosphorylation at T432 (P = 0.0773);Loss of phosphorylation at T432 (P = 0.0773);.;
MVP		0.43
MPC		0.82
ClinPred		1.0	D
GERP RS		5.7
Varity_R		0.82
gMVP		0.80

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: rs1553539264; hg19: chr2-233103332;