chr17-8247987-G-C

Variant names:

• chr17-8247987-G-C
• rs1988911087
• NM_025099.6:c.33+17C>G

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_025099.6(CTC1):​c.33+17C>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000355 in 1,407,072 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000036 (0 hom.)
• Consequence: CTC1 NM_025099.6 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.86
• Publications: 0 publications found

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]

PFAS (HGNC:8863): (phosphoribosylformylglycinamidine synthase) Purines are necessary for many cellular processes, including DNA replication, transcription, and energy metabolism. Ten enzymatic steps are required to synthesize inosine monophosphate (IMP) in the de novo pathway of purine biosynthesis. The enzyme encoded by this gene catalyzes the fourth step of IMP biosynthesis. [provided by RefSeq, Jul 2008]

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.79).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CTC1	NM_025099.6	c.33+17C>G		intron_variant	Intron 1 of 22	ENST00000651323.1	NP_079375.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CTC1	ENST00000651323.1	c.33+17C>G		intron_variant	Intron 1 of 22		NM_025099.6	ENSP00000498499.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 0.00000355 AC: 5 AN: 1407072 Hom.: 0 Cov.: 31 AF XY: 0.00000286 AC XY: 2 AN XY: 698930

African (AFR) AF: 0.00 AC: 0 AN: 32036

American (AMR) AF: 0.00 AC: 0 AN: 42786

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 24228

East Asian (EAS) AF: 0.00 AC: 0 AN: 35472

South Asian (SAS) AF: 0.0000117 AC: 1 AN: 85202

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 49734

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5462

European-Non Finnish (NFE) AF: 0.00000372 AC: 4 AN: 1075296

Other (OTH) AF: 0.00 AC: 0 AN: 56856

GnomAD4 genome Cov.: 31

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.79
CADD	Benign	0.17
DANN	Benign	0.55
PhyloP100		-1.9
PromoterAI		-0.22	Neutral

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.14		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs1988911087; hg19: chr17-8151305;