chr18-79679637-G-C

Variant names:

• chr18-79679637-G-C
• rs75667721
• XM_047437922.1:c.236G>C

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The XM_047437922.1(CTDP1):​c.236G>C​(p.Gly79Ala) variant causes a missense 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. 4/4 in silico tools predict 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: 32)
• Consequence: CTDP1 XM_047437922.1 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.578

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-DT (HGNC:26370): (CTDP1 divergent transcript)

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.9).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CTDP1	XM_047437922.1	c.236G>C	p.Gly79Ala	missense_variant	Exon 1 of 13		XP_047293878.1
CTDP1	XM_047437926.1	c.155G>C	p.Gly52Ala	missense_variant	Exon 1 of 12		XP_047293882.1
CTDP1	XM_047437924.1	c.-44+407G>C		intron_variant	Intron 1 of 12		XP_047293880.1
CTDP1-DT	NR_136643.1	n.109C>G		non_coding_transcript_exon_variant	Exon 1 of 5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CTDP1-DT	ENST00000317008.4	n.109C>G		non_coding_transcript_exon_variant	Exon 1 of 5	2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 0

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.90
CADD	Benign	0.99
DANN	Benign	0.66

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs75667721; hg19: chr18-77439637;