chr18-33742984-G-A

Position:

• chr18-33742984-G-A

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 1P and 4B. PP5 BS2

The NM_030632.3(ASXL3):​c.3136G>A​(p.Gly1046Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000821 in 1,461,566 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000082 (0 hom.)
• Consequence: ASXL3 NM_030632.3 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 U:2
• Conservation: PhyloP100: 9.31

Genes affected

ASXL3 (HGNC:29357): (ASXL transcriptional regulator 3) This gene encodes a protein containing a plant homeodomain (PHD) zinc finger domain that plays a role in the regulation of gene transcription. The encoded protein has been shown to negatively regulate lipogenesis by binding to and inhibiting the transcriptional activity of two nuclear hormone receptors, oxysterols receptor LXR-alpha (LXRalpha) and thyroid hormone receptor beta (TRbeta). The encoded protein may also inhibit histone deubiquitination. Mutations in this gene have been identified in human patients with Bainbridge-Ropers syndrome, which is characterized by feeding difficulties, developmental delay and other features. [provided by RefSeq, May 2017]

LOC124904347 (HGNC:):

ACMG classification

Verdict is Likely_benign. Variant got -3 ACMG points.

• PP5: Variant 18-33742984-G-A is Pathogenic according to our data. Variant chr18-33742984-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 402202.We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=1, Uncertain_significance=2}. Variant chr18-33742984-G-A is described in Lovd as [Pathogenic].
• BS2: High AC in GnomAdExome4 at 12 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ASXL3	NM_030632.3	c.3136G>A	p.Gly1046Arg	missense_variant	12/12	ENST00000269197.12
LOC124904347	XR_007066447.1	n.391C>T		non_coding_transcript_exon_variant	2/2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ASXL3	ENST00000269197.12	c.3136G>A	p.Gly1046Arg	missense_variant	12/12	5	NM_030632.3	P4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.0000161 AC: 4 AN: 248448 Hom.: 0 AF XY: 0.0000148 AC XY: 2 AN XY: 134870

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000327

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000267

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000821 AC: 12 AN: 1461566 Hom.: 0 Cov.: 33 AF XY: 0.00000963 AC XY: 7 AN XY: 727062

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000252

Gnomad4 SAS exome AF: 0.0000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000899

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000121 AC: 1

ExAC AF: 0.0000248 AC: 3

EpiCase AF: 0.00

EpiControl AF: 0.0000595

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1 Uncertain:2

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Severe feeding difficulties-failure to thrive-microcephaly due to ASXL3 deficiency syndrome Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Jan 18, 2019	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Neuberg Centre For Genomic Medicine, NCGM	-	The missense c.3136G>Ap.Gly1046Arg in ASXL3 gene has been reported in an individual affected with ASXL3 related disorders. The variant is reported with an allele frequency of 0.002% in the gnomAD exomes database and is novel not in any individuals in 1000 Genomes database. This variant has been reported to the ClinVar database as Likely pathogenic/ Uncertain significance. The amino acid change p.Gly1046Arg in ASXL3 is predicted as conserved by GERP++ and PhyloP across 100 vertebrates. The amino acid Gly at position 1046 is changed to a Arg changing protein sequence and it might alter its composition and physico-chemical properties. Additional Functional studies are required to prove pathogenicity of the variant. For these reasons, this variant has been classified as Variant of Uncertain significance VUS. -

Abnormal brain morphology Pathogenic:1

Likely pathogenic, criteria provided, single submitter

research

Lupski Lab, Baylor-Hopkins CMG, Baylor College of Medicine

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.80
BayesDel_addAF	Uncertain	0.038	T
BayesDel_noAF	Uncertain	-0.080
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Benign	0.11	T;.
Eigen	Uncertain	0.30
Eigen_PC	Uncertain	0.33
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Benign	0.74	T;T
M_CAP	Benign	0.013	T
MetaRNN	Uncertain	0.44	T;T
MetaSVM	Benign	-0.93	T
MutationAssessor	Benign	0.97	L;.
MutationTaster	Benign	1.0	D
PrimateAI	Uncertain	0.66	T
PROVEAN	Benign	-0.35	N;.
REVEL	Benign	0.26
Sift	Benign	0.15	T;.
Sift4G	Benign	0.46	T;.
Polyphen		1.0	D;.
Vest4		0.86
MutPred		0.23		Gain of methylation at G1046 (P = 0.0158);.;
MVP		0.11
MPC		0.57
ClinPred		0.92	D
GERP RS		5.9
Varity_R		0.19
gMVP		0.55

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: rs376997378; hg19: chr18-31322948;