chr2-19941796-A-G

Variant names:

• chr2-19941796-A-G
• rs199952377
• NM_001006657.2:c.1922T>C

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_001006657.2(WDR35):​c.1922T>C​(p.Leu641Ser) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000704 in 1,421,202 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 7.0e-7 (0 hom.)
• Consequence: WDR35 NM_001006657.2 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 8.99
• Publications: 0 publications found

Genes affected

WDR35 (HGNC:29250): (WD repeat domain 35) This gene encodes a member of the WD repeat protein family. WD repeats are minimally conserved regions of approximately 40 amino acids typically bracketed by gly-his and trp-asp (GH-WD), which may facilitate formation of heterotrimeric or multiprotein complexes. Members of this family are involved in a variety of cellular processes, including cell cycle progression, signal transduction, apoptosis, and gene regulation. Multiple alternatively spliced transcript variants encoding distinct isoforms have been found for this gene. Two patients with Sensenbrenner syndrome / cranioectodermal dysplasia (CED) were identified with mutations in this gene, consistent with a possible ciliary function.[provided by RefSeq, Sep 2010]

WDR35 Gene-Disease associations (from GenCC):

• cranioectodermal dysplasia 2

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, PanelApp Australia, ClinGen, Ambry Genetics
• short-rib thoracic dysplasia 7 with or without polydactyly

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: ClinGen, Orphanet, Labcorp Genetics (formerly Invitae)
• cranioectodermal dysplasia

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• short rib-polydactyly syndrome, Verma-Naumoff type

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.873

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
WDR35	NM_001006657.2	c.1922T>C	p.Leu641Ser	missense_variant	Exon 18 of 28	ENST00000345530.8	NP_001006658.1
WDR35	NM_020779.4	c.1889T>C	p.Leu630Ser	missense_variant	Exon 17 of 27	ENST00000281405.9	NP_065830.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
WDR35	ENST00000345530.8	c.1922T>C	p.Leu641Ser	missense_variant	Exon 18 of 28	1	NM_001006657.2	ENSP00000314444.5
WDR35	ENST00000281405.9	c.1889T>C	p.Leu630Ser	missense_variant	Exon 17 of 27	1	NM_020779.4	ENSP00000281405.5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 7.04e-7 AC: 1 AN: 1421202 Hom.: 0 Cov.: 28 AF XY: 0.00000142 AC XY: 1 AN XY: 704674

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 32918

American (AMR) AF: 0.00 AC: 0 AN: 42504

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25006

East Asian (EAS) AF: 0.00 AC: 0 AN: 39132

South Asian (SAS) AF: 0.00 AC: 0 AN: 83200

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 50946

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5576

European-Non Finnish (NFE) AF: 9.23e-7 AC: 1 AN: 1083588

Other (OTH) AF: 0.00 AC: 0 AN: 58332

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.92
BayesDel_addAF	Pathogenic	0.52	D
BayesDel_noAF	Pathogenic	0.51
CADD	Pathogenic	30
DANN	Uncertain	1.0
DEOGEN2	Benign	0.23	.;T;.
Eigen	Pathogenic	0.82
Eigen_PC	Pathogenic	0.78
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.94	D;D;D
M_CAP	Pathogenic	0.38	D
MetaRNN	Pathogenic	0.87	D;D;D
MetaSVM	Pathogenic	0.92	D
MutationAssessor	Pathogenic	3.2	.;M;.
PhyloP100		9.0
PrimateAI	Uncertain	0.75	T
PROVEAN	Pathogenic	-5.6	D;D;D
REVEL	Pathogenic	0.74
Sift	Pathogenic	0.0	D;D;D
Sift4G	Pathogenic	0.0010	D;D;D
Polyphen		1.0	D;D;.
Vest4		0.94
MutPred		0.41		.;Loss of sheet (P = 0.0104);.;
MVP		0.97
MPC		0.65
ClinPred		1.0	D
GERP RS		5.6
Varity_R		0.80
gMVP		0.91
Mutation Taster		=9/91	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.24		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.24		Position offset: 43

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

Other links and lift over

dbSNP: rs199952377; hg19: chr2-20141557;