18-79717515-C-A

Variant names:

• chr18-79717515-C-A
• rs8084175
• NM_004715.5:c.2069-20C>A

Variant summary

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

The NM_004715.5(CTDP1):​c.2069-20C>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,459,182 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: 34)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: CTDP1 NM_004715.5 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.383
• Publications: 0 publications found

Genes affected

CTDP1 (HGNC:2498): (CTD phosphatase subunit 1) This gene encodes a protein which interacts with the carboxy-terminus of the RAP74 subunit of transcription initiation factor TFIIF, and functions as a phosphatase that processively dephosphorylates the C-terminus of POLR2A (a subunit of RNA polymerase II), making it available for initiation of gene expression. Mutations in this gene are associated with congenital cataracts, facial dysmorphism and neuropathy syndrome (CCFDN). Alternatively spliced transcript variants encoding different isoforms have been described for this gene. [provided by RefSeq, Feb 2011]

CTDP1 Gene-Disease associations (from GenCC):

• congenital cataracts-facial dysmorphism-neuropathy syndrome

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics

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=-0.81).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_004715.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CTDP1	NM_004715.5	MANE Select	c.2069-20C>A		intron	N/A	NP_004706.3
	CTDP1	NM_001318511.2		c.2069-20C>A		intron	N/A	NP_001305440.1
	CTDP1	NM_048368.4		c.2069-20C>A		intron	N/A	NP_430255.2	Q9Y5B0-4

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CTDP1	ENST00000613122.5	TSL:1 MANE Select	c.2069-20C>A		intron	N/A	ENSP00000484525.2	Q9Y5B0-1
	CTDP1	ENST00000075430.11	TSL:1	c.2069-20C>A		intron	N/A	ENSP00000075430.7	Q9Y5B0-4
	CTDP1	ENST00000591598.5	TSL:1	c.1865-20C>A		intron	N/A	ENSP00000465119.1	K7EJD2

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1459182 Hom.: 0 Cov.: 38 AF XY: 0.00 AC XY: 0 AN XY: 725944

African (AFR) AF: 0.00 AC: 0 AN: 33428

American (AMR) AF: 0.00 AC: 0 AN: 44686

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26090

East Asian (EAS) AF: 0.00 AC: 0 AN: 39692

South Asian (SAS) AF: 0.00 AC: 0 AN: 86172

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52496

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4692

European-Non Finnish (NFE) AF: 9.00e-7 AC: 1 AN: 1111708

Other (OTH) AF: 0.00 AC: 0 AN: 60218

GnomAD4 genome Cov.: 34

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.81
CADD	Benign	1.3
DANN	Benign	0.64
PhyloP100		-0.38
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs8084175; hg19: chr18-77477515;