9-133274306-G-A

Position:

• chr9-133274306-G-A

Variant summary

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

The ENST00000538324.2(ABO):​c.28+856C>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.453 in 151,964 control chromosomes in the GnomAD database, including 15,900 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 0.45 (15900 hom., cov: 32)
• Consequence: ABO ENST00000538324.2 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.28

Genes affected

ABO (HGNC:79): (ABO, alpha 1-3-N-acetylgalactosaminyltransferase and alpha 1-3-galactosyltransferase) This gene encodes proteins related to the first discovered blood group system, ABO. Variation in the ABO gene (chromosome 9q34.2) is the basis of the ABO blood group, thus the presence of an allele determines the blood group in an individual. The 'O' blood group is caused by a deletion of guanine-258 near the N-terminus of the protein which results in a frameshift and translation of an almost entirely different protein. Individuals with the A, B, and AB alleles express glycosyltransferase activities that convert the H antigen into the A or B antigen. Other minor alleles have been found for this gene. [provided by RefSeq, Apr 2022]

ACMG classification

Verdict is Benign. Variant got -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.88).
• BA1: GnomAd4 highest subpopulation (AMR) allele frequency at 95% confidence interval = 0.541 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ABO	NM_020469.3	c.28+856C>T		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ABO	ENST00000538324.2	c.28+856C>T		intron_variant		5		A2

Frequencies

GnomAD3 genomes AF: 0.453 AC: 68776 AN: 151844 Hom.: 15890 Cov.: 32

Gnomad AFR AF: 0.436

Gnomad AMI AF: 0.239

Gnomad AMR AF: 0.551

Gnomad ASJ AF: 0.443

Gnomad EAS AF: 0.411

Gnomad SAS AF: 0.347

Gnomad FIN AF: 0.344

Gnomad MID AF: 0.491

Gnomad NFE AF: 0.472

Gnomad OTH AF: 0.460

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

GnomAD4 genome AF: 0.453 AC: 68814 AN: 151964 Hom.: 15900 Cov.: 32 AF XY: 0.448 AC XY: 33290 AN XY: 74250

Gnomad4 AFR AF: 0.435

Gnomad4 AMR AF: 0.551

Gnomad4 ASJ AF: 0.443

Gnomad4 EAS AF: 0.411

Gnomad4 SAS AF: 0.346

Gnomad4 FIN AF: 0.344

Gnomad4 NFE AF: 0.472

Gnomad4 OTH AF: 0.460

Alfa AF: 0.468 Hom.: 25121

Bravo AF: 0.472

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.88
CADD	Benign	0.54

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs630014; hg19: chr9-136149722;