dbSNP rs188658691: CTC1:p.Leu63Leu (chr17-8242993-G-C) – ACMG Classification: Benign (-19 pts)

Variant summary

Our verdict is Benign. The variant received -19 ACMG points: 0P and 19B. BP4_ModerateBP6_Very_StrongBP7BS1BS2

The NM_025099.6(CTC1):c.189C>G(p.Leu63Leu) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000445 in 1,611,800 control chromosomes in the GnomAD database, including 4 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.00051 ( 1 hom., cov: 31)

Exomes 𝑓: 0.00044 ( 3 hom. )

Consequence

CTC1
NM_025099.6 synonymous

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:5

Conservation

PhyloP100: 1.17

Publications

3 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):

cerebroretinal microangiopathy with calcifications and cysts 1
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), PanelApp Australia, Ambry Genetics, G2P
dyskeratosis congenita
Inheritance: AR, AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: G2P, Orphanet
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 -19 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.41).

BP6

Variant 17-8242993-G-C is Benign according to our data. Variant chr17-8242993-G-C is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 326088.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BP7

Synonymous conserved (PhyloP=1.17 with no splicing effect.

BS1

Variant frequency is greater than expected in population eas. GnomAdExome4 allele frequency = 0.000438 (640/1459594) while in subpopulation EAS AF = 0.00792 (314/39634). AF 95% confidence interval is 0.0072. There are 3 homozygotes in GnomAdExome4. There are 325 alleles in the male GnomAdExome4 subpopulation. Median coverage is 31. This position passed quality control check.

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
CTC1	NM_025099.6	MANE Select	c.189C>G	p.Leu63Leu	synonymous	Exon 2 of 23	NP_079375.3
CTC1	NM_001411067.1		c.189C>G	p.Leu63Leu	synonymous	Exon 2 of 21	NP_001397996.1
CTC1	NR_046431.2		n.209C>G		non_coding_transcript_exon	Exon 2 of 22

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
CTC1	ENST00000651323.1	MANE Select	c.189C>G	p.Leu63Leu	synonymous	Exon 2 of 23	ENSP00000498499.1
CTC1	ENST00000932859.1		c.189C>G	p.Leu63Leu	synonymous	Exon 2 of 23	ENSP00000602918.1
CTC1	ENST00000968384.1		c.189C>G	p.Leu63Leu	synonymous	Exon 2 of 23	ENSP00000638443.1

Frequencies

GnomAD3 genomes

AF:

0.000513

AC:

AN:

152088

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00259

Gnomad EAS

AF:

0.00462

Gnomad SAS

AF:

0.000828

Gnomad FIN

AF:

0.00283

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000162

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000729

AC:

179

AN:

245658

AF XY:

0.000736

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00312

Gnomad EAS exome

AF:

0.00309

Gnomad FIN exome

AF:

0.00235

Gnomad NFE exome

AF:

0.000198

Gnomad OTH exome

AF:

0.000672

GnomAD4 exome

AF:

0.000438

AC:

640

AN:

1459594

Hom.:

Cov.:

AF XY:

0.000448

AC XY:

325

AN XY:

725934

show subpopulations

African (AFR)

AF:

0.0000299

AC:

AN:

33420

American (AMR)

AF:

0.00

AC:

AN:

44432

Ashkenazi Jewish (ASJ)

AF:

0.00223

AC:

AN:

26040

East Asian (EAS)

AF:

0.00792

AC:

314

AN:

39634

South Asian (SAS)

AF:

0.000478

AC:

AN:

85786

European-Finnish (FIN)

AF:

0.00169

AC:

AN:

53330

Middle Eastern (MID)

AF:

0.000708

AC:

AN:

5650

European-Non Finnish (NFE)

AF:

0.0000918

AC:

102

AN:

1110984

Other (OTH)

AF:

0.000497

AC:

AN:

60318

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.497

Heterozygous variant carriers

113

151

189

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

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

AF:

0.000512

AC:

AN:

152206

Hom.:

Cov.:

AF XY:

0.000645

AC XY:

AN XY:

74416

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41512

American (AMR)

AF:

0.00

AC:

AN:

15272

Ashkenazi Jewish (ASJ)

AF:

0.00259

AC:

AN:

3472

East Asian (EAS)

AF:

0.00463

AC:

AN:

5186

South Asian (SAS)

AF:

0.000829

AC:

AN:

4828

European-Finnish (FIN)

AF:

0.00283

AC:

AN:

10600

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.000162

AC:

AN:

68020

Other (OTH)

AF:

0.00

AC:

AN:

2110

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.503

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:

0.000508

Hom.:

Bravo

AF:

0.000306

Asia WGS

AF:

0.00202

AC:

AN:

3478

ClinVar

ClinVar submissions as Germline

Significance:Benign/Likely benign

Revision:criteria provided, multiple submitters, no conflicts

View on ClinVar

Pathogenic

VUS

Benign

Condition

Dyskeratosis congenita (3)

Cerebroretinal microangiopathy with calcifications and cysts 1 (1)

not specified (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.41

CADD

Benign

7.3

(source)

DANN

Benign

0.78

PhyloP100

1.2

Mutation Taster

=92/8

polymorphism

(source)

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

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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