NM_205768.3:c.1444C>T

Variant names:

• chr1-244055218-C-T
• rs1553270634
• NM_205768.3:c.1444C>T

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM1 PM2 PP3 PP5

The NM_205768.3(ZBTB18):​c.1444C>T​(p.Arg482Cys) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R482H) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: ZBTB18 NM_205768.3 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 U:1
• Conservation: PhyloP100: 4.75
• Publications: 2 publications found

Genes affected

ZBTB18 (HGNC:13030): (zinc finger and BTB domain containing 18) This gene encodes a C2H2-type zinc finger protein which acts a transcriptional repressor of genes involved in neuronal development. The encoded protein recognizes a specific sequence motif and recruits components of chromatin to target genes. Alternative splicing results in multiple transcript variants. [provided by RefSeq, May 2013]

ZBTB18 Gene-Disease associations (from GenCC):

• complex neurodevelopmental disorder

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• intellectual disability, autosomal dominant 22

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Illumina, G2P

ACMG classification

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PM1: In a hotspot region, there are 6 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 4 uncertain in NM_205768.3
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.776
• PP5: Variant 1-244055218-C-T is Pathogenic according to our data. Variant chr1-244055218-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 548012.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_205768.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ZBTB18	NM_205768.3	MANE Select	c.1444C>T	p.Arg482Cys	missense	Exon 2 of 2	NP_991331.1
	ZBTB18	NM_001278196.2		c.1417C>T	p.Arg473Cys	missense	Exon 2 of 2	NP_001265125.1
	ZBTB18	NM_006352.5		c.1417C>T	p.Arg473Cys	missense	Exon 1 of 1	NP_006343.2

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ZBTB18	ENST00000358704.4	TSL:1 MANE Select	c.1444C>T	p.Arg482Cys	missense	Exon 2 of 2	ENSP00000351539.4
	ZBTB18	ENST00000622512.1	TSL:3	c.1417C>T	p.Arg473Cys	missense	Exon 2 of 2	ENSP00000481278.1
	ZBTB18	ENST00000696616.1		c.1417C>T	p.Arg473Cys	missense	Exon 2 of 2	ENSP00000512756.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1 Uncertain:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Intellectual disability, autosomal dominant 22 Pathogenic:1

Nov 21, 2017

Mayo Clinic Laboratories, Mayo Clinic

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

not provided Uncertain:1

May 01, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces arginine, which is basic and polar, with cysteine, which is neutral and slightly polar, at codon 482 of the ZBTB18 protein (p.Arg482Cys). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with ZBTB18-related conditions (PMID: 33004838, 33144682). ClinVar contains an entry for this variant (Variation ID: 548012). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt ZBTB18 protein function with a positive predictive value of 95%. Experimental studies have shown that this missense change affects ZBTB18 function (PMID: 33608456). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance.

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.98
BayesDel_addAF	Pathogenic	0.21	D
BayesDel_noAF	Uncertain	0.060
CADD	Pathogenic	34
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.69	D
Eigen	Pathogenic	0.73
Eigen_PC	Pathogenic	0.73
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.97	D
M_CAP	Benign	0.041	D
MetaRNN	Pathogenic	0.78	D
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.9	L
PhyloP100		4.8
PrimateAI	Pathogenic	0.92	D
PROVEAN	Pathogenic	-6.9	D
REVEL	Uncertain	0.30
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.76
MutPred		0.62		Loss of MoRF binding (P = 0.001)
MVP		0.59
MPC		2.2
ClinPred		0.99	D
GERP RS		5.8
Varity_R		0.49
gMVP		0.94
Mutation Taster		=9/91	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs1553270634; hg19: chr1-244218520; COSMIC: COSV62396575;