chr14-20456930-C-T

Position:

• chr14-20456930-C-T

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_Strong BS1 BS2

The NM_001641.4(APEX1):​c.440-61C>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00168 in 1,603,288 control chromosomes in the GnomAD database, including 37 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 0.0091 (21 hom., cov: 33)
  • Exomes 𝑓: 0.00090 (16 hom.)
• Consequence: APEX1 NM_001641.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -3.06

Genes affected

APEX1 (HGNC:587): (apurinic/apyrimidinic endodeoxyribonuclease 1) The APEX gene encodes the major AP endonuclease in human cells. It encodes the APEX endonuclease, a DNA repair enzyme with apurinic/apyrimidinic (AP) activity. Such AP activity sites occur frequently in DNA molecules by spontaneous hydrolysis, by DNA damaging agents or by DNA glycosylases that remove specific abnormal bases. The AP sites are the most frequent pre-mutagenic lesions that can prevent normal DNA replication. Splice variants have been found for this gene; all encode the same protein. Disruptions in the biological functions related to APEX are associated with many various malignancies and neurodegenerative diseases.[provided by RefSeq, Dec 2019]

APEX1 (HGNC:):

ACMG classification

Verdict is Benign. Variant got -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.83).
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.0091 (1386/152378) while in subpopulation AFR AF= 0.0317 (1319/41582). AF 95% confidence interval is 0.0303. There are 21 homozygotes in gnomad4. There are 649 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 21 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
APEX1	NM_001641.4	c.440-61C>T		intron_variant		ENST00000216714.8	NP_001632.2
APEX1	NM_001244249.2	c.440-61C>T		intron_variant			NP_001231178.1
APEX1	NM_080648.3	c.440-61C>T		intron_variant			NP_542379.1
APEX1	NM_080649.3	c.440-61C>T		intron_variant			NP_542380.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
APEX1	ENST00000216714.8	c.440-61C>T		intron_variant		1	NM_001641.4	ENSP00000216714.3

Frequencies

GnomAD3 genomes AF: 0.00905 AC: 1378 AN: 152260 Hom.: 21 Cov.: 33

Gnomad AFR AF: 0.0316

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00275

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00316

Gnomad NFE AF: 0.0000882

Gnomad OTH AF: 0.00860

GnomAD4 exome AF: 0.000897 AC: 1302 AN: 1450910 Hom.: 16 Cov.: 32 AF XY: 0.000791 AC XY: 570 AN XY: 721024

Gnomad4 AFR exome AF: 0.0320

Gnomad4 AMR exome AF: 0.00167

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000822

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000398

Gnomad4 OTH exome AF: 0.00178

GnomAD4 genome AF: 0.00910 AC: 1386 AN: 152378 Hom.: 21 Cov.: 33 AF XY: 0.00871 AC XY: 649 AN XY: 74518

Gnomad4 AFR AF: 0.0317

Gnomad4 AMR AF: 0.00274

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000882

Gnomad4 OTH AF: 0.00851

Alfa AF: 0.00784 Hom.: 2

Bravo AF: 0.0102

Asia WGS AF: 0.00231 AC: 8 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.83
CADD	Benign	0.028
DANN	Benign	0.63

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: rs3136819; hg19: chr14-20925089;