Genetic Variant CTU2:p.Ala42Pro (chr16-88707191-G-C) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_001012759.3(CTU2):c.124G>C(p.Ala42Pro) variant causes a missense change. The variant allele was found at a frequency of 0.000000684 in 1,461,596 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A42T) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

CTU2
NM_001012759.3 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 6.56

Publications

0 publications found

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 Gene-Disease associations (from GenCC):

microcephaly, facial dysmorphism, renal agenesis, and ambiguous genitalia syndrome
Inheritance: AR Classification: STRONG, LIMITED Submitted by: Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae)

CTU2 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CTU2	NM_001012759.3 link	c.124G>C	p.Ala42Pro	missense_variant	Exon 2 of 15	ENST00000453996.7	NP_001012777.1	Q2VPK5-1
CTU2	NM_001318507.2 link	c.124G>C	p.Ala42Pro	missense_variant	Exon 2 of 15		NP_001305436.1	Q2VPK5H3BSW6
CTU2	NM_001012762.3 link	c.124G>C	p.Ala42Pro	missense_variant	Exon 2 of 14		NP_001012780.1	Q2VPK5-5
CTU2	NM_001318513.2 link	c.-59G>C		5_prime_UTR_variant	Exon 2 of 14		NP_001305442.1	Q2VPK5-3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CTU2	ENST00000453996.7 link	c.124G>C	p.Ala42Pro	missense_variant	Exon 2 of 15	1	NM_001012759.3	ENSP00000388320.2		Q2VPK5-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461596

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

727072

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33478

American (AMR)

AF:

0.00

AC:

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26134

East Asian (EAS)

AF:

0.00

AC:

AN:

39698

South Asian (SAS)

AF:

0.00

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53218

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5766

European-Non Finnish (NFE)

AF:

8.99e-7

AC:

AN:

1111942

Other (OTH)

AF:

0.00

AC:

AN:

60380

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.22

BayesDel_addAF

Uncertain

0.13

BayesDel_noAF

Uncertain

-0.050

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.015

T;.;.

Eigen

Uncertain

0.57

Eigen_PC

Uncertain

0.51

FATHMM_MKL

Uncertain

0.81

LIST_S2

Benign

0.84

T;T;T

M_CAP

Benign

0.037

MetaRNN

Uncertain

0.69

D;D;D

MetaSVM

Benign

-0.74

MutationAssessor

Uncertain

2.6

M;M;.

PhyloP100

6.6

PrimateAI

Uncertain

0.78

PROVEAN

Uncertain

-2.6

D;D;D

REVEL

Benign

0.25

Sift

Uncertain

0.027

D;T;D

Sift4G

Uncertain

0.042

D;D;D

Polyphen

1.0

D;D;.

Vest4

0.63

MutPred

0.69

Loss of sheet (P = 0.0011);Loss of sheet (P = 0.0011);Loss of sheet (P = 0.0011);

MVP

0.58

ClinPred

0.99

GERP RS

4.2

Varity_R

0.53

gMVP

0.52

Mutation Taster

=73/27

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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chr16-88707191-G-C

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over