9-133256028-C-G

Position:

• chr9-133256028-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The ENST00000538324.2(ABO):​c.700G>C​(p.Gly234Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G234S) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: ABO ENST00000538324.2 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.461

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 Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.15322232).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ABO	NM_020469.3	c.700G>C	p.Gly234Arg	missense_variant	8/8		NP_065202.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ABO	ENST00000538324.2	c.700G>C	p.Gly234Arg	missense_variant	8/9	5		ENSP00000483018	A2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 79

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.22	D
BayesDel_noAF	Uncertain	0.070
CADD	Benign	11
DANN	Benign	0.37
DEOGEN2	Benign	0.19	T;.
FATHMM_MKL	Benign	0.13	N
LIST_S2	Benign	0.15	T;T
MetaRNN	Benign	0.15	T;T
PrimateAI	Benign	0.42	T
Sift4G	Benign	0.091	T;T
Vest4		0.28
MVP		0.099
GERP RS		2.5
gMVP		0.65

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: rs8176743; hg19: chr9-136131415;