rs878853055

Variant names:

• chrX-80689977-G-A
• rs878853055
• NM_153252.5:c.3718C>T

Variant summary

Our verdict is Pathogenic. The variant received 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_153252.5(BRWD3):​c.3718C>T​(p.Arg1240*) variant causes a stop gained change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 22)
• Consequence: BRWD3 NM_153252.5 stop_gained
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 7.64
• Publications: 1 publications found

Genes affected

BRWD3 (HGNC:17342): (bromodomain and WD repeat domain containing 3) The protein encoded by this gene contains a bromodomain and several WD repeats. It is thought to have a chromatin-modifying function, and may thus play a role in transcription. Mutations in this gene are associated with a spectrum of cognitive disabilities and X-linked macrocephaly. This gene is also associated with translocations in patients with B-cell chronic lymphocytic leukemia. [provided by RefSeq, Jul 2017]

BRWD3 Gene-Disease associations (from GenCC):

• intellectual disability, X-linked 93

  Inheritance: XL, AD Classification: DEFINITIVE, STRONG, MODERATE Submitted by: G2P, Labcorp Genetics (formerly Invitae), Ambry Genetics
• X-linked syndromic intellectual disability

  Inheritance: XL Classification: DEFINITIVE Submitted by: ClinGen
• infantile spasms

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics
• self-limited epilepsy with centrotemporal spikes

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

ACMG classification

Our verdict: Pathogenic. The variant received 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant X-80689977-G-A is Pathogenic according to our data. Variant chrX-80689977-G-A is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 235505.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BRWD3	NM_153252.5	c.3718C>T	p.Arg1240*	stop_gained	Exon 32 of 41	ENST00000373275.5	NP_694984.5
BRWD3	NM_001441339.1	c.3568C>T	p.Arg1190*	stop_gained	Exon 31 of 40		NP_001428268.1
BRWD3	XM_017029384.2	c.2506C>T	p.Arg836*	stop_gained	Exon 21 of 30		XP_016884873.1
BRWD3	XM_047441957.1	c.3718C>T	p.Arg1240*	stop_gained	Exon 32 of 38		XP_047297913.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
BRWD3	ENST00000373275.5	c.3718C>T	p.Arg1240*	stop_gained	Exon 32 of 41	1	NM_153252.5	ENSP00000362372.4
BRWD3	ENST00000473691.1	n.1854C>T		non_coding_transcript_exon_variant	Exon 16 of 25	2

Frequencies

GnomAD3 genomes Cov.: 22

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 22

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:2

Apr 22, 2016

Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Feb 28, 2024

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Nonsense variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss of function is a known mechanism of disease; Not observed in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 35266334) -

Intellectual disability, X-linked 93 Pathogenic:1

-

Medical Genetic Institute of Henan Province, Henan Provincial People’s Hospital

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: case-control

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.63
CADD	Pathogenic	39
DANN	Uncertain	1.0
FATHMM_MKL	Pathogenic	0.99	D
PhyloP100		7.6
Vest4		0.47
GERP RS		3.5
Mutation Taster		=10/190	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.060		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs878853055; hg19: chrX-79945476; COSMIC: COSV64743451;