Genetic Variant ZIC2:p.Ala463_Ala469del (chr13-99985460-AGCGGCGGCGGCGGCTGCGGCG-A) – ACMG Classification: Likely_benign (-5 pts)

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 0P and 5B. BP3BS2

The NM_007129.5(ZIC2):c.1386_1406delGGCGGCTGCGGCGGCGGCGGC(p.Ala463_Ala469del) variant causes a disruptive inframe deletion change. The variant allele was found at a frequency of 0.0000189 in 1,375,446 control chromosomes in the GnomAD database, including 1 homozygotes. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000019 ( 1 hom. )

Consequence

ZIC2
NM_007129.5 disruptive_inframe_deletion

Scores

Not classified

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 5.97

Variant links:

Genes affected

ZIC2 (HGNC:12873): (Zic family member 2) This gene encodes a member of the ZIC family of C2H2-type zinc finger proteins. This protein functions as a transcriptional repressor and may regulate tissue specific expression of dopamine receptor D1. Expansion of an alanine repeat in the C-terminus of the encoded protein and other mutations in this gene cause holoprosencephaly type 5. Holoprosencephaly is the most common structural anomaly of the human brain. A polyhistidine tract polymorphism in this gene may be associated with increased risk of neural tube defects. This gene is closely linked to a gene encoding zinc finger protein of the cerebellum 5, a related family member on chromosome 13. [provided by RefSeq, Jul 2016]

ZIC2 links:

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ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -5 ACMG points.

BP3

Nonframeshift variant in repetitive region in NM_007129.5

BS2

High AC in GnomAdExome4 at 23 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ZIC2	NM_007129.5 link	c.1386_1406delGGCGGCTGCGGCGGCGGCGGC	p.Ala463_Ala469del	disruptive_inframe_deletion	Exon 3 of 3	ENST00000376335.8	NP_009060.2	O95409A0A024RDY6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ZIC2	ENST00000376335.8 link	c.1386_1406delGGCGGCTGCGGCGGCGGCGGC	p.Ala463_Ala469del	disruptive_inframe_deletion	Exon 3 of 3	1	NM_007129.5	ENSP00000365514.3		O95409

Frequencies

GnomAD3 genomes

AF:

0.0000267

AC:

AN:

149586

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000244

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000133

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.000488

GnomAD3 exomes

AF:

0.0000750

AC:

AN:

93320

Hom.:

AF XY:

0.0000540

AC XY:

AN XY:

55576

show subpopulations

Gnomad AFR exome

AF:

0.000251

Gnomad AMR exome

AF:

0.000357

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000607

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000188

AC:

AN:

1225762

Hom.:

AF XY:

0.0000183

AC XY:

AN XY:

600918

show subpopulations

Gnomad4 AFR exome

AF:

0.0000792

Gnomad4 AMR exome

AF:

0.000110

Gnomad4 ASJ exome

AF:

0.0000517

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000218

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000129

Gnomad4 OTH exome

AF:

0.0000802

GnomAD4 genome

AF:

0.0000200

AC:

AN:

149684

Hom.:

Cov.:

AF XY:

0.0000274

AC XY:

AN XY:

73030

show subpopulations

Gnomad4 AFR

AF:

0.0000244

Gnomad4 AMR

AF:

0.0000664

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.000483

Bravo

AF:

0.0000264

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Holoprosencephaly 5

Uncertain:1

Nov 11, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant, c.1386_1406del, results in the deletion of 7 amino acid(s) of the ZIC2 protein (p.Ala464_Ala470del), but otherwise preserves the integrity of the reading frame. The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This variant has not been reported in the literature in individuals affected with ZIC2-related conditions. ClinVar contains an entry for this variant (Variation ID: 1346553). Experimental studies and prediction algorithms are not available or were not evaluated, and the functional significance of this variant is currently unknown. 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 v4.3

Name

Calibrated prediction

Score

Prediction

Splicing

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

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

13-99985460-AGCGGCGGCGGCGGCTGCGGCGGCGGCG-AGCGGCG

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over