Genetic Variant TELO2:c.2034+1G>A (chr16-1505602-G-A) – ACMG Classification: Uncertain_significance (4 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PVS1_ModeratePM2

The NM_016111.4(TELO2):c.2034+1G>A variant causes a splice donor, intron change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000901 in 1,332,248 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as no classification for the single variant (no stars).

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000090 ( 0 hom. )

Consequence

TELO2
NM_016111.4 splice_donor, intron

Scores

Splicing: ADA: 1.000

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 7.64

Publications

1 publications found

Variant links:

Genes affected

TELO2 (HGNC:29099): (telomere maintenance 2) This gene encodes a protein that functions as an S-phase checkpoint protein in the cell cycle. The protein may also play a role in DNA repair.[provided by RefSeq, Mar 2009]

TELO2 Gene-Disease associations (from GenCC):

TELO2-related intellectual disability-neurodevelopmental disorder
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet, ClinGen, G2P

TELO2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

PVS1

Splicing +-2 bp (donor or acceptor) variant, product NOT destroyed by NMD, known LOF gene, truncates exone, which is 0.07637232 fraction of the gene. Cryptic splice site detected, with MaxEntScore 3.8, offset of 14, new splice context is: ctgGTcagc. Cryptic site results in frameshift change. If cryptic site found is not functional and variant results in exon loss, it results in inframe change.

PM2

Very rare variant in population databases, with high coverage;

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_016111.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TELO2	NM_016111.4	MANE Select	c.2034+1G>A		splice_donor intron	N/A	NP_057195.2
	TELO2	NM_001351846.2		c.2034+1G>A		splice_donor intron	N/A	NP_001338775.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein
TELO2	ENST00000262319.11	TSL:1 MANE Select	c.2034+1G>A	splice_donor intron	N/A	ENSP00000262319.6
TELO2	ENST00000567423.1	TSL:5	c.453+1G>A	splice_donor intron	N/A	ENSP00000457461.1
TELO2	ENST00000497339.6	TSL:5	n.1228-671G>A	intron	N/A	ENSP00000456383.1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000901

AC:

AN:

1332248

Hom.:

Cov.:

AF XY:

0.00000757

AC XY:

AN XY:

660892

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

31836

American (AMR)

AF:

0.00

AC:

AN:

41320

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

21624

East Asian (EAS)

AF:

0.00

AC:

AN:

32252

South Asian (SAS)

AF:

0.00

AC:

AN:

84946

European-Finnish (FIN)

AF:

0.00

AC:

AN:

38410

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4768

European-Non Finnish (NFE)

AF:

0.0000117

AC:

AN:

1024722

Other (OTH)

AF:

0.00

AC:

AN:

52370

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.479

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.62

BayesDel_noAF

Uncertain

0.010

CADD

Pathogenic

(source)

DANN

Uncertain

0.99

Eigen

Pathogenic

0.96

Eigen_PC

Pathogenic

0.75

FATHMM_MKL

Pathogenic

0.97

PhyloP100

7.6

GERP RS

4.9

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Mutation Taster

=25/75

disease causing

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

1.0

dbscSNV1_RF

Pathogenic

0.91

SpliceAI score (max)

1.0

Details are displayed if max score is > 0.2

DS_DG_spliceai

0.72

Position offset: 13

DS_DL_spliceai

1.0

Position offset: -1

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

Publications

You must be logged in to view publications. This limit was set because tens of millions (!) of queries from AI bots are generated daily.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over