chr22-49884221-C-T

Variant names:

• chr22-49884221-C-T
• NM_014838.3:c.559C>T

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_014838.3(ZBED4):​c.559C>T​(p.Leu187Phe) 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. 15/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 34)
• Consequence: ZBED4 NM_014838.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.732
• Publications: 0 publications found

Genes affected

ZBED4 (HGNC:20721): (zinc finger BED-type containing 4) Enables identical protein binding activity. Predicted to be involved in positive regulation of transcription by RNA polymerase II. Located in cytoplasm and nucleoplasm. [provided by Alliance of Genome Resources, Apr 2022]

ALG12 (HGNC:19358): (ALG12 alpha-1,6-mannosyltransferase) This gene encodes a member of the glycosyltransferase 22 family. The encoded protein catalyzes the addition of the eighth mannose residue in an alpha-1,6 linkage onto the dolichol-PP-oligosaccharide precursor (dolichol-PP-Man(7)GlcNAc(2)) required for protein glycosylation. Mutations in this gene have been associated with congenital disorder of glycosylation type Ig (CDG-Ig)characterized by abnormal N-glycosylation. [provided by RefSeq, Jul 2008]

ALG12 Gene-Disease associations (from GenCC):

• ALG12-congenital disorder of glycosylation

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

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.11675197).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ZBED4	NM_014838.3	c.559C>T	p.Leu187Phe	missense_variant	Exon 2 of 2	ENST00000216268.6	NP_055653.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ZBED4	ENST00000216268.6	c.559C>T	p.Leu187Phe	missense_variant	Exon 2 of 2	1	NM_014838.3	ENSP00000216268.4
ZBED4	ENST00000850559.1	c.559C>T	p.Leu187Phe	missense_variant	Exon 2 of 2			ENSP00000520851.1
ZBED4	ENST00000850560.1	n.260+743C>T		intron_variant	Intron 2 of 3

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome Cov.: 82

GnomAD4 genome Cov.: 34

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Nov 25, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.559C>T (p.L187F) alteration is located in exon 2 (coding exon 1) of the ZBED4 gene. This alteration results from a C to T substitution at nucleotide position 559, causing the leucine (L) at amino acid position 187 to be replaced by a phenylalanine (F). 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	0.070
BayesDel_addAF	Benign	-0.22	T
BayesDel_noAF	Benign	-0.56
CADD	Benign	16
DANN	Uncertain	0.99
DEOGEN2	Benign	0.054	T
Eigen	Benign	-0.52
Eigen_PC	Benign	-0.63
FATHMM_MKL	Benign	0.31	N
LIST_S2	Benign	0.69	T
M_CAP	Benign	0.018	T
MetaRNN	Benign	0.12	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Uncertain	2.1	M
PhyloP100		0.73
PrimateAI	Benign	0.37	T
PROVEAN	Benign	-0.59	N
REVEL	Benign	0.074
Sift	Benign	0.075	T
Sift4G	Benign	0.064	T
Polyphen		0.90	P
Vest4		0.12
MutPred		0.17		Loss of glycosylation at S186 (P = 0.0624);
MVP		0.093
MPC		1.1
ClinPred		0.56	D
GERP RS		0.19
Varity_R		0.042
gMVP		0.21
Mutation Taster		=95/5	polymorphism

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

hg19: chr22-50277869; COSMIC: COSV108034166;