rs113994102

Variant names:

• chr18-79710825-C-T
• rs113994102
• NM_004715.5:c.863+389C>T

Variant summary

Our verdict is Likely pathogenic. Variant got 9 ACMG points: 10P and 1B. PM2 PP5_Very_Strong BP4

The NM_004715.5(CTDP1):​c.863+389C>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★).

• Frequency: Genomes: not found (cov: 26)
• Consequence: CTDP1 NM_004715.5 intron
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:6 O:1
• Conservation: PhyloP100: -1.29

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]

ACMG classification

Verdict is Likely_pathogenic. Variant got 9 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 18-79710825-C-T is Pathogenic according to our data. Variant chr18-79710825-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 5301.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr18-79710825-C-T is described in Lovd as [Pathogenic].
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-1.0). . Strength limited to SUPPORTING due to the PP5.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CTDP1	NM_004715.5	c.863+389C>T		intron_variant	Intron 6 of 12	ENST00000613122.5	NP_004706.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CTDP1	ENST00000613122.5	c.863+389C>T		intron_variant	Intron 6 of 12	1	NM_004715.5	ENSP00000484525.2
CTDP1	ENST00000075430.11	c.863+389C>T		intron_variant	Intron 6 of 11	1		ENSP00000075430.7
CTDP1	ENST00000591598.5	c.659+389C>T		intron_variant	Intron 6 of 11	1		ENSP00000465119.1

Frequencies

GnomAD3 genomes Cov.: 26

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 26

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:6 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:4

Mar 27, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

For these reasons, this variant has been classified as Pathogenic. Studies have shown that this variant is associated with altered splicing resulting in multiple RNA products (PMID: 14517542). This sequence change falls in intron 6 of the CTDP1 gene. It does not directly change the encoded amino acid sequence of the CTDP1 protein. This variant is not present in population databases (gnomAD no frequency). This variant has been observed in individual(s) with congenital cataracts, facial dysmorphism, and neuropathy (PMID: 14517542, 23408394, 24690360, 29174527). It is commonly reported in individuals of Romani ancestry (PMID: 24690360, 29174527). ClinVar contains an entry for this variant (Variation ID: 5301). -

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Clinical Genetics, Academic Medical Center

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

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Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Dec 01, 2023

CeGaT Center for Human Genetics Tuebingen

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

CTDP1: PM3:Very Strong, PM2, PS3:Supporting -

Congenital cataracts-facial dysmorphism-neuropathy syndrome Pathogenic:1 Other:1

Oct 01, 2004

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

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GeneReviews

Significance: not provided

Review Status: no classification provided

Collection Method: literature only

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Charcot-Marie-Tooth disease Pathogenic:1

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Inherited Neuropathy Consortium

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-1.0
CADD	Benign	4.7
DANN	Benign	0.65

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.13		Details are displayed if max score is > 0.2

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

Publications

LitVar

Other links and lift over

dbSNP: rs113994102; hg19: chr18-77470825;