20-57498685-C-G

Position:

• chr20-57498685-C-G

Variant summary

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

The NM_001386993.1(CTCFL):​c.1857G>C​(p.Glu619Asp) 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. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. E619V) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CTCFL NM_001386993.1 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.118

Genes affected

CTCFL (HGNC:16234): (CCCTC-binding factor like) CCCTC-binding factor (CTCF), an 11-zinc-finger factor involved in gene regulation, utilizes different zinc fingers to bind varying DNA target sites. CTCF forms methylation-sensitive insulators that regulate X-chromosome inactivation. This gene is a paralog of CTCF and appears to be expressed primarily in the cytoplasm of spermatocytes, unlike CTCF which is expressed primarily in the nucleus of somatic cells. CTCF and the protein encoded by this gene are normally expressed in a mutually exclusive pattern that correlates with resetting of methylation marks during male germ cell differentiation. Multiple alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jun 2012]

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 (MetaRNN=0.06280607).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CTCFL	NM_001386993.1	c.1857G>C	p.Glu619Asp	missense_variant	11/11	ENST00000243914.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CTCFL	ENST00000243914.8	c.1857G>C	p.Glu619Asp	missense_variant	11/11	1	NM_001386993.1	P4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000400 AC: 1 AN: 249744 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 134992

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000545

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jun 29, 2023

The c.1857G>C (p.E619D) alteration is located in exon 11 (coding exon 10) of the CTCFL gene. This alteration results from a G to C substitution at nucleotide position 1857, causing the glutamic acid (E) at amino acid position 619 to be replaced by an aspartic acid (D). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.093
BayesDel_addAF	Benign	-0.47	T
BayesDel_noAF	Benign	-0.74
CADD	Benign	13
DANN	Benign	0.56
DEOGEN2	Benign	0.025	.;T;T;.;T;T
Eigen	Benign	-0.97
Eigen_PC	Benign	-0.97
FATHMM_MKL	Benign	0.34	N
LIST_S2	Benign	0.53	T;.;.;T;.;T
M_CAP	Benign	0.0020	T
MetaRNN	Benign	0.063	T;T;T;T;T;T
MetaSVM	Benign	-0.97	T
MutationAssessor	Benign	0.11	N;N;N;.;N;N
MutationTaster	Benign	1.0	N;N;N;N
PrimateAI	Benign	0.30	T
PROVEAN	Benign	-0.22	N;.;.;N;N;N
REVEL	Benign	0.0080
Sift	Benign	0.15	T;.;.;T;T;T
Sift4G	Benign	0.41	T;T;T;T;T;T
Polyphen		0.0060	.;B;B;.;B;B
Vest4		0.16
MutPred		0.21		Gain of glycosylation at T622 (P = 0.1441);Gain of glycosylation at T622 (P = 0.1441);Gain of glycosylation at T622 (P = 0.1441);.;Gain of glycosylation at T622 (P = 0.1441);Gain of glycosylation at T622 (P = 0.1441);
MVP		0.13
MPC		0.50
ClinPred		0.034	T
GERP RS		2.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.059
gMVP		0.058

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

LitVar

Other links and lift over

dbSNP: rs748190815; hg19: chr20-56073741;