13-99982142-G-A

Variant names:

• chr13-99982142-G-A
• rs747154732
• NM_007129.5:c.78G>A

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP7

The NM_007129.5(ZIC2):​c.78G>A​(p.Ala26Ala) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000877 in 1,140,390 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. A26A) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 8.8e-7 (0 hom.)
• Consequence: ZIC2 NM_007129.5 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -2.71
• Publications: 0 publications found

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 Gene-Disease associations (from GenCC):

• holoprosencephaly 5

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Genomics England PanelApp, Ambry Genetics, G2P
• holoprosencephaly

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.63).
• BP7: Synonymous conserved (PhyloP=-2.71 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_007129.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ZIC2	NM_007129.5	MANE Select	c.78G>A	p.Ala26Ala	synonymous	Exon 1 of 3	NP_009060.2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ZIC2	ENST00000376335.8	TSL:1 MANE Select	c.78G>A	p.Ala26Ala	synonymous	Exon 1 of 3	ENSP00000365514.3	O95409

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 8.77e-7 AC: 1 AN: 1140390 Hom.: 0 Cov.: 30 AF XY: 0.00000183 AC XY: 1 AN XY: 547684

African (AFR) AF: 0.00 AC: 0 AN: 22990

American (AMR) AF: 0.00 AC: 0 AN: 9992

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 15704

East Asian (EAS) AF: 0.0000381 AC: 1 AN: 26270

South Asian (SAS) AF: 0.00 AC: 0 AN: 36568

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 25178

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 3874

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 953970

Other (OTH) AF: 0.00 AC: 0 AN: 45844

GnomAD4 genome Cov.: 31

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.63
CADD	Benign	4.8
DANN	Benign	0.95
PhyloP100		-2.7
PromoterAI		-0.0075	Neutral

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: rs747154732; hg19: chr13-100634396;