Genetic Variant NM_022830.3:c.1928G>C (chr11-62575791-C-G) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_022830.3(TUT1):c.1928G>C(p.Arg643Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,894 control chromosomes in the GnomAD database, with no homozygous occurrence. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R643Q) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

TUT1
NM_022830.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 1.47

Variant links:

Genes affected

TUT1 (HGNC:26184): (terminal uridylyl transferase 1, U6 snRNA-specific) This gene encodes a nucleotidyl transferase that functions as both a terminal uridylyltransferase and a nuclear poly(A) polymerase. The encoded enzyme specifically adds and removes nucleotides from the 3' end of small nuclear RNAs and select mRNAs and may function in controlling gene expression and cell proliferation.[provided by RefSeq, Apr 2009]

TUT1 links:

ENSG00000255508 (HGNC:):

ENSG00000255508 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 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
TUT1	NM_022830.3 link	c.1928G>C	p.Arg643Pro	missense_variant	Exon 9 of 9	ENST00000476907.6	NP_073741.3	Q9H6E5A0A0A8K9B1F5H0R1
TUT1	NM_001367906.1 link	c.*342G>C		3_prime_UTR_variant	Exon 9 of 9		NP_001354835.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TUT1	ENST00000476907.6 link	c.1928G>C	p.Arg643Pro	missense_variant	Exon 9 of 9	1	NM_022830.3	ENSP00000419607.1		Q9H6E5
ENSG00000255508	ENST00000496634.2 link	n.1474+866G>C		intron_variant	Intron 8 of 16	2		ENSP00000456163.1		H3BRB1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461894

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

727248

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

8.99e-7

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Oct 22, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.2042G>C (p.R681P) alteration is located in exon 9 (coding exon 9) of the TUT1 gene. This alteration results from a G to C substitution at nucleotide position 2042, causing the arginine (R) at amino acid position 681 to be replaced by a proline (P). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.17

BayesDel_addAF

Benign

-0.065

BayesDel_noAF

Benign

-0.33

CADD

Benign

DANN

Uncertain

0.98

DEOGEN2

Benign

0.040

.;T

Eigen

Benign

-0.018

Eigen_PC

Benign

-0.058

FATHMM_MKL

Uncertain

0.86

LIST_S2

Benign

0.75

T;T

M_CAP

Benign

0.016

MetaRNN

Uncertain

0.44

T;T

MetaSVM

Benign

-1.1

MutationAssessor

Uncertain

2.3

.;M

PrimateAI

Benign

0.34

PROVEAN

Benign

-0.93

N;N

REVEL

Benign

0.14

Sift

Benign

0.13

T;T

Sift4G

Benign

0.14

T;T

Polyphen

0.95

P;P

Vest4

0.50

MutPred

0.25

Gain of glycosylation at R681 (P = 0.0233);.;

MVP

0.53

MPC

0.92

ClinPred

0.71

GERP RS

5.0

Varity_R

0.22

gMVP

0.31

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

No publications associated with this variant yet.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over