20-32434963-G-C

Position:

• chr20-32434963-G-C

Variant summary

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

The NM_015338.6(ASXL1):​c.2251G>C​(p.Val751Leu) 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. 15/21 in silico tools predict 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. V751I) has been classified as Benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: ASXL1 NM_015338.6 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.10

Genes affected

ASXL1 (HGNC:18318): (ASXL transcriptional regulator 1) This gene is similar to the Drosophila additional sex combs gene, which encodes a chromatin-binding protein required for normal determination of segment identity in the developing embryo. The protein is a member of the Polycomb group of proteins, which are necessary for the maintenance of stable repression of homeotic and other loci. The protein is thought to disrupt chromatin in localized areas, enhancing transcription of certain genes while repressing the transcription of other genes. The protein encoded by this gene functions as a ligand-dependent co-activator for retinoic acid receptor in cooperation with nuclear receptor coactivator 1. Mutations in this gene are associated with myelodysplastic syndromes and chronic myelomonocytic leukemia. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Sep 2009]

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=0.069570035).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ASXL1	NM_015338.6	c.2251G>C	p.Val751Leu	missense_variant	13/13	ENST00000375687.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ASXL1	ENST00000375687.10	c.2251G>C	p.Val751Leu	missense_variant	13/13	5	NM_015338.6	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.098
BayesDel_addAF	Benign	-0.35	T
BayesDel_noAF	Benign	-0.75
CADD	Benign	0.0080
DANN	Benign	0.69
DEOGEN2	Benign	0.044	T;T;T;.;T
Eigen	Benign	-1.5
Eigen_PC	Benign	-1.7
FATHMM_MKL	Benign	0.20	N
LIST_S2	Benign	0.59	.;T;.;T;T
M_CAP	Benign	0.0052	T
MetaRNN	Benign	0.070	T;T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.4	L;L;L;.;.
MutationTaster	Benign	1.0	N;N
PrimateAI	Benign	0.24	T
PROVEAN	Benign	-0.79	N;.;.;.;N
REVEL	Benign	0.21
Sift	Uncertain	0.012	D;.;.;.;D
Sift4G	Benign	0.33	T;T;T;.;T
Polyphen		0.0020	B;B;B;.;.
Vest4		0.033
MutPred		0.071		Loss of phosphorylation at T754 (P = 0.1579);Loss of phosphorylation at T754 (P = 0.1579);Loss of phosphorylation at T754 (P = 0.1579);.;.;
MVP		0.11
MPC		0.060
ClinPred		0.074	T
GERP RS		-9.9
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.073
gMVP		0.095

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: rs6058693; hg19: chr20-31022766;