20-32434645-GGTG-T

Variant names:

• chr20-32434645-GGTG-T
• NM_015338.6:c.1933_1936delGGTGinsT

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 3P and 0B. PM2 PM4_Supporting

The NM_015338.6(ASXL1):​c.1933_1936delGGTGinsT​(p.Gly645_Gly646delinsCys) variant causes a missense, disruptive inframe deletion change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. G645G) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: ASXL1 NM_015338.6 missense, disruptive_inframe_deletion
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.38
• Publications: 0 publications found

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]

ASXL1 Gene-Disease associations (from GenCC):

• Bohring-Opitz syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), ClinGen, Orphanet, Laboratory for Molecular Medicine, G2P, Illumina

ACMG classification

Our verdict: Uncertain_significance. The variant received 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM4: Nonframeshift variant in NON repetitive region in NM_015338.6. Strenght limited to Supporting due to length of the change: 1aa.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_015338.6. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ASXL1	NM_015338.6	MANE Select	c.1933_1936delGGTGinsT	p.Gly645_Gly646delinsCys	missense disruptive_inframe_deletion	Exon 13 of 13	NP_056153.2
	ASXL1	NM_001363734.1		c.1750_1753delGGTGinsT	p.Gly584_Gly585delinsCys	missense disruptive_inframe_deletion	Exon 12 of 12	NP_001350663.1	A0A2R8Y5U1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ASXL1	ENST00000375687.10	TSL:5 MANE Select	c.1933_1936delGGTGinsT	p.Gly645_Gly646delinsCys	missense disruptive_inframe_deletion	Exon 13 of 13	ENSP00000364839.4	Q8IXJ9-1
	ASXL1	ENST00000306058.9	TSL:1	c.1918_1921delGGTGinsT	p.Gly640_Gly641delinsCys	missense disruptive_inframe_deletion	Exon 12 of 12	ENSP00000305119.5	Q76L82
	ASXL1	ENST00000905973.1		c.1930_1933delGGTGinsT	p.Gly644_Gly645delinsCys	missense disruptive_inframe_deletion	Exon 12 of 12	ENSP00000576032.1

Frequencies

GnomAD3 genomes Cov.: 32

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

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		7.4

Splicing

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

Other links and lift over

hg19: chr20-31022448;