rs12718597

Positions:

• chr7-50360730-C-A
• chr7-50360730-C-T

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_006060.6(IKZF1):​c.161-15803C>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.321 in 152,226 control chromosomes in the GnomAD database, including 8,258 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.32 (8258 hom., cov: 33)
• Consequence: IKZF1 NM_006060.6 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.94

Genes affected

IKZF1 (HGNC:13176): (IKAROS family zinc finger 1) This gene encodes a transcription factor that belongs to the family of zinc-finger DNA-binding proteins associated with chromatin remodeling. The expression of this protein is restricted to the fetal and adult hemo-lymphopoietic system, and it functions as a regulator of lymphocyte differentiation. Several alternatively spliced transcript variants encoding different isoforms have been described for this gene. Most isoforms share a common C-terminal domain, which contains two zinc finger motifs that are required for hetero- or homo-dimerization, and for interactions with other proteins. The isoforms, however, differ in the number of N-terminal zinc finger motifs that bind DNA and in nuclear localization signal presence, resulting in members with and without DNA-binding properties. Only a few isoforms contain the requisite three or more N-terminal zinc motifs that confer high affinity binding to a specific core DNA sequence element in the promoters of target genes. The non-DNA-binding isoforms are largely found in the cytoplasm, and are thought to function as dominant-negative factors. Overexpression of some dominant-negative isoforms have been associated with B-cell malignancies, such as acute lymphoblastic leukemia (ALL). [provided by RefSeq, May 2014]

ACMG classification

Verdict is Benign. Variant got -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.82).
• BA1: GnomAd4 highest subpopulation (NFE) allele frequency at 95% confidence interval = 0.369 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
IKZF1	NM_006060.6	c.161-15803C>A		intron_variant		ENST00000331340.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
IKZF1	ENST00000331340.8	c.161-15803C>A		intron_variant		1	NM_006060.6	A1

Frequencies

GnomAD3 genomes AF: 0.321 AC: 48774 AN: 152108 Hom.: 8258 Cov.: 33

Gnomad AFR AF: 0.242

Gnomad AMI AF: 0.263

Gnomad AMR AF: 0.349

Gnomad ASJ AF: 0.447

Gnomad EAS AF: 0.170

Gnomad SAS AF: 0.360

Gnomad FIN AF: 0.257

Gnomad MID AF: 0.402

Gnomad NFE AF: 0.373

Gnomad OTH AF: 0.379

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.321 AC: 48796 AN: 152226 Hom.: 8258 Cov.: 33 AF XY: 0.316 AC XY: 23502 AN XY: 74426

Gnomad4 AFR AF: 0.242

Gnomad4 AMR AF: 0.349

Gnomad4 ASJ AF: 0.447

Gnomad4 EAS AF: 0.170

Gnomad4 SAS AF: 0.360

Gnomad4 FIN AF: 0.257

Gnomad4 NFE AF: 0.373

Gnomad4 OTH AF: 0.378

Alfa AF: 0.337 Hom.: 6197

Bravo AF: 0.327

Asia WGS AF: 0.299 AC: 1042 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.82
CADD	Benign	0.46
DANN	Benign	0.71

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: rs12718597; hg19: chr7-50428428;