16-88709982-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 4P and 1B. PM2PP3PP5BP4

The NM_001012759.3(CTU2):c.188T>C(p.Leu63Pro) variant causes a missense change. The variant allele was found at a frequency of 0.00105 in 1,613,952 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. L63V) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00056 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0011 ( 0 hom. )

Consequence

CTU2
NM_001012759.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1U:2

Conservation

PhyloP100: 5.21

Variant links:

Genes affected

CTU2 (HGNC:28005): (cytosolic thiouridylase subunit 2) This gene encodes a protein which is involved in the post-transcriptional modification of transfer RNAs (tRNAs). The encoded protein plays a role in thiolation of uridine residue present at the wobble position in a subset of tRNAs, resulting in enhanced codon reading accuracy. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Jan 2016]

CTU2 links:

(HGNC:):

links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

Multiple lines of computational evidence support a deleterious effect 6: AlphaMissense, BayesDel_noAF, Cadd, MutationAssessor, PrimateAI, PROVEAN [when BayesDel_addAF, max_spliceai, MetaRNN, MutationTaster was below the threshold]

PP5

Variant 16-88709982-T-C is Pathogenic according to our data. Variant chr16-88709982-T-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 635410.We mark this variant Likely_pathogenic, oryginal submissions are: {Uncertain_significance=2, Pathogenic=1}.

BP4

Computational evidence support a benign effect (MetaRNN=0.23819351).. Strength limited to SUPPORTING due to the PP5.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
CTU2	NM_001012759.3 linkuse as main transcript	c.188T>C	p.Leu63Pro	missense_variant	3/15	ENST00000453996.7
CTU2	NM_001318507.2 linkuse as main transcript	c.188T>C	p.Leu63Pro	missense_variant	3/15
CTU2	NM_001012762.3 linkuse as main transcript	c.188T>C	p.Leu63Pro	missense_variant	3/14
CTU2	NM_001318513.2 linkuse as main transcript	c.-39-241T>C		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CTU2	ENST00000453996.7 linkuse as main transcript	c.188T>C	p.Leu63Pro	missense_variant	3/15	1	NM_001012759.3	P2	Q2VPK5-1
	ENST00000616106.1 linkuse as main transcript	n.456A>G		non_coding_transcript_exon_variant	1/1

Frequencies

GnomAD3 genomes

AF:

0.000565

AC:

AN:

152200

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000724

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000196

Gnomad ASJ

AF:

0.000288

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.000565

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00106

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.000796

AC:

200

AN:

251340

Hom.:

AF XY:

0.000795

AC XY:

108

AN XY:

135888

show subpopulations

Gnomad AFR exome

AF:

0.0000616

Gnomad AMR exome

AF:

0.0000578

Gnomad ASJ exome

AF:

0.00109

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.000370

Gnomad NFE exome

AF:

0.00156

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.00110

AC:

1610

AN:

1461634

Hom.:

Cov.:

AF XY:

0.00104

AC XY:

755

AN XY:

727104

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.0000671

Gnomad4 ASJ exome

AF:

0.000612

Gnomad4 EAS exome

AF:

0.0000252

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.000357

Gnomad4 NFE exome

AF:

0.00136

Gnomad4 OTH exome

AF:

0.000911

GnomAD4 genome

AF:

0.000565

AC:

AN:

152318

Hom.:

Cov.:

AF XY:

0.000483

AC XY:

AN XY:

74492

show subpopulations

Gnomad4 AFR

AF:

0.0000722

Gnomad4 AMR

AF:

0.000196

Gnomad4 ASJ

AF:

0.000288

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.000565

Gnomad4 NFE

AF:

0.00106

Gnomad4 OTH

AF:

0.000473

Alfa

AF:

0.00129

Hom.:

Bravo

AF:

0.000604

TwinsUK

AF:

0.00243

AC:

ALSPAC

AF:

0.00104

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.00140

AC:

ExAC

AF:

0.000980

AC:

119

EpiCase

AF:

0.00153

EpiControl

AF:

0.00119

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1Uncertain:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Microcephaly, facial dysmorphism, renal agenesis, and ambiguous genitalia syndrome

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Department Of Translational Genomics (developmental Genetics Section), King Faisal Specialist Hospital & Research Centre

- -

CTU2-related disorder

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Dec 06, 2023

The CTU2 c.188T>C variant is predicted to result in the amino acid substitution p.Leu63Pro. This variant in the compound heterozygous condition along with a second variant in this gene was reported in one individual with Intellectual disability (Table 4, Helsmoortel et al. 2015. PubMed ID: 25081361) and was reported in the homozygous condition in two unrelated individuals with DREAM‐PL syndrome (dysmorphic facies, renal agenesis, ambiguous genitalia, microcephaly, polydactyly, and lissencephaly) (Table 1, Shaheen et al. 2019. PubMed ID: 31301155). This variant is reported in 0.15% of alleles in individuals of European (non-Finnish) descent in gnomAD. At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Dec 07, 2023

This sequence change replaces leucine with proline at codon 63 of the CTU2 protein (p.Leu63Pro). The leucine residue is highly conserved and there is a moderate physicochemical difference between leucine and proline. This variant is present in population databases (rs147948789, gnomAD 0.1%), and has an allele count higher than expected for a pathogenic variant. This missense change has been observed in individual(s) with clinical features of DREAM-PL (dysmorphic facies, renal agenesis, ambiguous genitalia, microcephaly,polydactyly, and lissencephaly) (PMID: 25081361, 31301155). ClinVar contains an entry for this variant (Variation ID: 635410). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt CTU2 protein function with a positive predictive value of 80%. 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.87

BayesDel_addAF

Benign

-0.035

BayesDel_noAF

Pathogenic

0.17

Cadd

Pathogenic

Dann

Uncertain

1.0

DEOGEN2

Benign

0.24

T;.;.;.

Eigen

Uncertain

0.64

Eigen_PC

Uncertain

0.55

FATHMM_MKL

Uncertain

0.92

LIST_S2

Benign

0.83

T;T;D;T

M_CAP

Uncertain

0.27

MetaRNN

Benign

0.24

T;T;T;T

MetaSVM

Benign

-0.33

MutationAssessor

Pathogenic

3.2

M;M;.;.

MutationTaster

Benign

1.0

D;D;D;D

PrimateAI

Pathogenic

0.82

PROVEAN

Pathogenic

-6.2

D;D;D;D

REVEL

Uncertain

0.61

Sift

Uncertain

0.0020

D;D;D;D

Sift4G

Pathogenic

0.0

D;D;D;D

Polyphen

1.0

D;D;.;.

Vest4

0.95

MVP

0.64

ClinPred

0.42

GERP RS

4.0

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.0

Varity_R

0.94

gMVP

0.89

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over