chr18-33745544-G-C

Position:

• chr18-33745544-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP6_Moderate

The NM_030632.3(ASXL3):​c.5696G>C​(p.Arg1899Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Likely benign (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: ASXL3 NM_030632.3 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:1
• Conservation: PhyloP100: 7.24

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP6: Variant 18-33745544-G-C is Benign according to our data. Variant chr18-33745544-G-C is described in ClinVar as [Likely_benign]. Clinvar id is 434428.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ASXL3	NM_030632.3	c.5696G>C	p.Arg1899Pro	missense_variant	12/12	ENST00000269197.12	NP_085135.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ASXL3	ENST00000269197.12	c.5696G>C	p.Arg1899Pro	missense_variant	12/12	5	NM_030632.3	ENSP00000269197.4
ASXL3	ENST00000696964.1	c.5699G>C	p.Arg1900Pro	missense_variant	13/13			ENSP00000513003.1
ASXL3	ENST00000681521.1	c.5576G>C	p.Arg1859Pro	missense_variant	11/11			ENSP00000506037.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 56

GnomAD4 genome Cov.: 32

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1 Benign:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Nov 26, 2024

The c.5696G>C (p.R1899P) alteration is located in exon 12 (coding exon 12) of the ASXL3 gene. This alteration results from a G to C substitution at nucleotide position 5696, causing the arginine (R) at amino acid position 1899 to be replaced by a proline (P). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

not specified Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Genetic Services Laboratory, University of Chicago

Feb 09, 2018

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.52
BayesDel_addAF	Pathogenic	0.20	D
BayesDel_noAF	Uncertain	0.050
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Benign	0.11	T
Eigen	Uncertain	0.63
Eigen_PC	Uncertain	0.64
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Uncertain	0.86	D
M_CAP	Benign	0.026	D
MetaRNN	Uncertain	0.69	D
MetaSVM	Benign	-0.98	T
MutationAssessor	Uncertain	2.4	M
PrimateAI	Uncertain	0.60	T
PROVEAN	Benign	-2.2	N
REVEL	Benign	0.26
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.71
MutPred		0.29		Loss of helix (P = 0.028);
MVP		0.43
MPC		0.60
ClinPred		0.98	D
GERP RS		5.6
Varity_R		0.63
gMVP		0.73

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: rs562192619; hg19: chr18-31325508;