17-67918802-G-A

Variant names:

• chr17-67918802-G-A
• rs1425998598
• NM_182641.4:c.5392G>A

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 3P and 1B. PM2 PP5 BP4

The NM_182641.4(BPTF):​c.5392G>A​(p.Ala1798Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,492 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (no stars).

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: BPTF NM_182641.4 missense
• Clinical Significance: Likely pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 10.0
• Publications: 1 publications found

Genes affected

BPTF (HGNC:3581): (bromodomain PHD finger transcription factor) This gene was identified by the reactivity of its encoded protein to a monoclonal antibody prepared against brain homogenates from patients with Alzheimer's disease. Analysis of the original protein (fetal Alz-50 reactive clone 1, or FAC1), identified as an 810 aa protein containing a DNA-binding domain and a zinc finger motif, suggested it might play a role in the regulation of transcription. High levels of FAC1 were detected in fetal brain and in patients with neurodegenerative diseases. The protein encoded by this gene is actually much larger than originally thought, and it also contains a C-terminal bromodomain characteristic of proteins that regulate transcription during proliferation. The encoded protein is highly similar to the largest subunit of the Drosophila NURF (nucleosome remodeling factor) complex. In Drosophila, the NURF complex, which catalyzes nucleosome sliding on DNA and interacts with sequence-specific transcription factors, is necessary for the chromatin remodeling required for transcription. Two alternative transcripts encoding different isoforms have been described completely. [provided by RefSeq, Jul 2008]

BPTF Gene-Disease associations (from GenCC):

• syndromic intellectual disability

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: ClinGen, Orphanet, Illumina
• neurodevelopmental disorder with dysmorphic facies and distal limb anomalies

  Inheritance: AD Classification: STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 17-67918802-G-A is Pathogenic according to our data. Variant chr17-67918802-G-A is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 431070.Status of the report is no_assertion_criteria_provided, 0 stars.
• BP4: Computational evidence support a benign effect (MetaRNN=0.37115973). . Strength limited to SUPPORTING due to the PP5.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BPTF	NM_182641.4	c.5392G>A	p.Ala1798Thr	missense_variant	Exon 12 of 28	ENST00000306378.11	NP_872579.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
BPTF	ENST00000306378.11	c.5392G>A	p.Ala1798Thr	missense_variant	Exon 12 of 28	1	NM_182641.4	ENSP00000307208.6

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461492 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 727086

⚠️ 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: 33474

American (AMR) AF: 0.00 AC: 0 AN: 44714

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26118

East Asian (EAS) AF: 0.00 AC: 0 AN: 39680

South Asian (SAS) AF: 0.00 AC: 0 AN: 86254

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53384

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5766

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1111734

Other (OTH) AF: 0.00 AC: 0 AN: 60368

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 31

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Secondary microcephaly;C0454641:Expressive language delay;C0557874:Global developmental delay Pathogenic:1

Jul 03, 2017

Baylor Genetics

Significance: Likely pathogenic

Review Status: no assertion criteria provided

Collection Method: research

This missense variant was found de novo in an 11-year-old male with global developmental delay, hypotonia, dysmorphic features, myopia. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.11
BayesDel_addAF	Benign	-0.086	T
BayesDel_noAF	Benign	-0.36
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Benign	0.28	.;T;.;.;.;.
Eigen	Uncertain	0.65
Eigen_PC	Pathogenic	0.69
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Benign	0.84	T;D;D;D;D;D
M_CAP	Benign	0.012	T
MetaRNN	Benign	0.37	T;T;T;T;T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.7	.;L;.;.;.;.
PhyloP100		10
PrimateAI	Uncertain	0.62	T
PROVEAN	Benign	-2.3	.;N;D;.;.;.
REVEL	Benign	0.25
Sift	Benign	0.11	.;T;T;.;.;.
Sift4G	Benign	0.15	T;T;T;.;.;T
Polyphen		0.94	.;.;P;.;.;.
Vest4		0.39, 0.45
MutPred		0.21		.;Gain of glycosylation at A1924 (P = 0.0239);.;.;.;.;
MVP		0.52
MPC		1.0
ClinPred		0.92	D
GERP RS		5.5
RBP_binding_hub_radar		0.92
RBP_regulation_power_radar		2.6
Varity_R		0.12
gMVP		0.46
Mutation Taster		=14/86	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs1425998598; hg19: chr17-65914918;