chr6-33279328-T-C

Position:

• chr6-33279328-T-C

Variant summary

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

The NM_005452.6(WDR46):​c.1781A>G​(p.Lys594Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000205 in 1,461,844 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: WDR46 NM_005452.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.483

Genes affected

WDR46 (HGNC:13923): (WD repeat domain 46) Enables RNA binding activity. Predicted to be involved in maturation of SSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA). Predicted to be located in nucleoplasm. Predicted to be part of small-subunit processome. Predicted to be active in nucleolus. [provided by Alliance of Genome Resources, Apr 2022]

B3GALT4 (HGNC:919): (beta-1,3-galactosyltransferase 4) This gene is a member of the beta-1,3-galactosyltransferase (beta3GalT) gene family. This family encodes type II membrane-bound glycoproteins with diverse enzymatic functions using different donor substrates (UDP-galactose and UDP-N-acetylglucosamine) and different acceptor sugars (N-acetylglucosamine, galactose, N-acetylgalactosamine). The beta3GalT genes are distantly related to the Drosophila Brainiac gene and have the protein coding sequence contained in a single exon. The beta3GalT proteins also contain conserved sequences not found in the beta4GalT or alpha3GalT proteins. The carbohydrate chains synthesized by these enzymes are designated as type 1, whereas beta4GalT enzymes synthesize type 2 carbohydrate chains. The ratio of type 1:type 2 chains changes during embryogenesis. By sequence similarity, the beta3GalT genes fall into at least two groups: beta3GalT4 and 4 other beta3GalT genes (beta3GalT1-3, beta3GalT5). This gene is oriented telomere to centromere in close proximity to the ribosomal protein S18 gene. The functionality of the encoded protein is limited to ganglioseries glycolipid biosynthesis. [provided by RefSeq, Jul 2008]

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=0.111322254).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
WDR46	NM_005452.6	c.1781A>G	p.Lys594Arg	missense_variant	15/15	ENST00000374617.9
WDR46	NM_001164267.2	c.1619A>G	p.Lys540Arg	missense_variant	15/15
WDR46	XM_047419523.1	c.1463A>G	p.Lys488Arg	missense_variant	14/14

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
WDR46	ENST00000374617.9	c.1781A>G	p.Lys594Arg	missense_variant	15/15	1	NM_005452.6	P1
WDR46	ENST00000461951.5	n.449A>G		non_coding_transcript_exon_variant	5/5	3
WDR46	ENST00000473611.5	n.652A>G		non_coding_transcript_exon_variant	4/4	3
B3GALT4	ENST00000606990.1	n.313+328T>C		intron_variant, non_coding_transcript_variant		2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1461844 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 727224

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000270

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Oct 29, 2021

The c.1781A>G (p.K594R) alteration is located in exon 15 (coding exon 15) of the WDR46 gene. This alteration results from a A to G substitution at nucleotide position 1781, causing the lysine (K) at amino acid position 594 to be replaced by an arginine (R). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.076
BayesDel_addAF	Benign	-0.18	T
BayesDel_noAF	Benign	-0.49
CADD	Benign	13
DANN	Benign	0.96
DEOGEN2	Benign	0.0088	T
Eigen	Benign	-0.60
Eigen_PC	Benign	-0.63
FATHMM_MKL	Benign	0.36	N
LIST_S2	Benign	0.59	T
M_CAP	Benign	0.0075	T
MetaRNN	Benign	0.11	T
MetaSVM	Benign	-1.0	T
MutationTaster	Benign	0.62	D
PrimateAI	Benign	0.42	T
PROVEAN	Benign	-1.2	N
REVEL	Benign	0.052
Sift	Benign	0.097	T
Sift4G	Benign	0.087	T
Polyphen		0.61	P
Vest4		0.21
MutPred		0.17		Loss of ubiquitination at K594 (P = 0.0546);
MVP		0.18
MPC		0.27
ClinPred		0.70	D
GERP RS		4.3
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.050
gMVP		0.13

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		Details are displayed if max score is > 0.2

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr6-33247105;