Genetic Variant NM_025099.6:c.147C>T (chr17-8243035-G-A) – ACMG Classification: Benign (-10 pts)

Variant summary

Our verdict is Benign. The variant received -10 ACMG points: 0P and 10B. BP4_StrongBP6BP7BS2

The NM_025099.6(CTC1):c.147C>T(p.Val49Val) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000895 in 1,613,820 control chromosomes in the GnomAD database, including 3 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. V49V) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.0011 ( 0 hom., cov: 31)

Exomes 𝑓: 0.00088 ( 3 hom. )

Consequence

CTC1
NM_025099.6 synonymous

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:9

Conservation

PhyloP100: -0.229

Publications

1 publications found

Variant links:

Genes affected

CTC1 (HGNC:26169): (CST telomere replication complex component 1) This gene encodes a component of the CST complex. This complex plays an essential role in protecting telomeres from degradation. This protein also forms a heterodimer with the CST complex subunit STN1 to form the enzyme alpha accessory factor. This enzyme regulates DNA replication. Mutations in this gene are the cause of cerebroretinal microangiopathy with calcifications and cysts. Alternate splicing results in both coding and non-coding variants. [provided by RefSeq, Mar 2012]

CTC1 Gene-Disease associations (from GenCC):

dyskeratosis congenita
Inheritance: AD, AR Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, G2P
cerebroretinal microangiopathy with calcifications and cysts 1
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae)
Coats plus syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

CTC1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -10 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.69).

BP6

Variant 17-8243035-G-A is Benign according to our data. Variant chr17-8243035-G-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 434855.

BP7

Synonymous conserved (PhyloP=-0.229 with no splicing effect.

BS2

High Homozygotes in GnomAdExome4 at 3 AR,AD gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_025099.6. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
CTC1	NM_025099.6	MANE Select	c.147C>T	p.Val49Val	synonymous	Exon 2 of 23	NP_079375.3
CTC1	NM_001411067.1		c.147C>T	p.Val49Val	synonymous	Exon 2 of 21	NP_001397996.1	J3KSZ1
CTC1	NR_046431.2		n.167C>T		non_coding_transcript_exon	Exon 2 of 22

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
CTC1	ENST00000651323.1	MANE Select	c.147C>T	p.Val49Val	synonymous	Exon 2 of 23	ENSP00000498499.1	Q2NKJ3-1
CTC1	ENST00000932859.1		c.147C>T	p.Val49Val	synonymous	Exon 2 of 23	ENSP00000602918.1
CTC1	ENST00000968384.1		c.147C>T	p.Val49Val	synonymous	Exon 2 of 23	ENSP00000638443.1

Frequencies

GnomAD3 genomes

AF:

0.00107

AC:

163

AN:

152148

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000966

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000328

Gnomad ASJ

AF:

0.00202

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.000942

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00200

Gnomad OTH

AF:

0.000478

GnomAD2 exomes

AF:

0.000867

AC:

216

AN:

249020

AF XY:

0.000873

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000580

Gnomad ASJ exome

AF:

0.00447

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.000882

Gnomad NFE exome

AF:

0.00126

Gnomad OTH exome

AF:

0.00132

GnomAD4 exome

AF:

0.000877

AC:

1282

AN:

1461554

Hom.:

Cov.:

AF XY:

0.000917

AC XY:

667

AN XY:

727038

show subpopulations

African (AFR)

AF:

0.0000598

AC:

AN:

33470

American (AMR)

AF:

0.000291

AC:

AN:

44700

Ashkenazi Jewish (ASJ)

AF:

0.00387

AC:

101

AN:

26130

East Asian (EAS)

AF:

0.00

AC:

AN:

39686

South Asian (SAS)

AF:

0.00

AC:

AN:

86142

European-Finnish (FIN)

AF:

0.00103

AC:

AN:

53406

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5764

European-Non Finnish (NFE)

AF:

0.000946

AC:

1052

AN:

1111870

Other (OTH)

AF:

0.000977

AC:

AN:

60386

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.470

Heterozygous variant carriers

126

189

252

315

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

120

<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

AF:

0.00107

AC:

163

AN:

152266

Hom.:

Cov.:

AF XY:

0.00101

AC XY:

AN XY:

74452

show subpopulations

African (AFR)

AF:

0.0000963

AC:

AN:

41544

American (AMR)

AF:

0.000327

AC:

AN:

15286

Ashkenazi Jewish (ASJ)

AF:

0.00202

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5184

South Asian (SAS)

AF:

0.00

AC:

AN:

4826

European-Finnish (FIN)

AF:

0.000942

AC:

AN:

10620

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00200

AC:

136

AN:

68020

Other (OTH)

AF:

0.000473

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.508

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome 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

Alfa

AF:

0.00212

Hom.:

Bravo

AF:

0.000740

EpiCase

AF:

0.00115

EpiControl

AF:

0.000653

ClinVar

ClinVar submissions

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

Dyskeratosis congenita (3)

not provided (3)

not specified (2)

Cerebroretinal microangiopathy with calcifications and cysts 1 (1)

CTC1-related disorder (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.69

CADD

Benign

5.9

(source)

DANN

Benign

0.76

PhyloP100

-0.23

Mutation Taster

=100/0

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.070

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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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over