Genetic Variant NM_153252.5:c.2184G>T (chrX-80717620-C-A) – ACMG Classification: Likely_benign (-1 pts)

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 2P and 3B. PM2BP4_ModerateBP7

The NM_153252.5(BRWD3):c.2184G>T(p.Ala728Ala) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000911 in 1,097,919 control chromosomes in the GnomAD database, with no homozygous occurrence. There are no hemizygote samples in GnomAD. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. A728A) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 23)

Exomes 𝑓: 9.1e-7 ( 0 hom. 0 hem. )

Consequence

BRWD3
NM_153252.5 synonymous

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -0.409

Publications

0 publications found

Variant links:

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

BRWD3 links:

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ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.24).

BP7

Synonymous conserved (PhyloP=-0.409 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BRWD3	NM_153252.5 link	c.2184G>T	p.Ala728Ala	synonymous_variant	Exon 19 of 41	ENST00000373275.5	NP_694984.5	Q6RI45-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
BRWD3	ENST00000373275.5 link	c.2184G>T	p.Ala728Ala	synonymous_variant	Exon 19 of 41	1	NM_153252.5	ENSP00000362372.4	Q6RI45-1
BRWD3	ENST00000473691.1 link	n.320G>T		non_coding_transcript_exon_variant	Exon 3 of 25	2
BRWD3	ENST00000497335.1 link	n.222G>T		non_coding_transcript_exon_variant	Exon 2 of 2	3

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

9.11e-7

AC:

AN:

1097919

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

363349

show subpopulations

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

African (AFR)

AF:

0.0000379

AC:

AN:

26395

American (AMR)

AF:

0.00

AC:

AN:

35207

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

19378

East Asian (EAS)

AF:

0.00

AC:

AN:

30197

South Asian (SAS)

AF:

0.00

AC:

AN:

54140

European-Finnish (FIN)

AF:

0.00

AC:

AN:

40523

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4135

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

841858

Other (OTH)

AF:

0.00

AC:

AN:

46086

⚠️ 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.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.375

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

Cov.:

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.00000756

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.24

CADD

Benign

6.0

(source)

DANN

Benign

0.65

PhyloP100

-0.41

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over