17-67825932-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 3P and 1B. PM2 PP2 BP4

The NM_182641.4(BPTF):c.208G>T(p.Gly70Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 30)
  • Exomes 𝑓: 0.0000012 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: BPTF NM_182641.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.44

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, BPTF
• BP4: Computational evidence support a benign effect (MetaRNN=0.30305067).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
BPTF	NM_182641.4	c.208G>T	p.Gly70Cys	missense_variant	1/28	ENST00000306378.11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
BPTF	ENST00000306378.11	c.208G>T	p.Gly70Cys	missense_variant	1/28	1	NM_182641.4
BPTF	ENST00000582467.2	c.208G>T	p.Gly70Cys	missense_variant	1/32	5		P1
BPTF	ENST00000321892.8	c.208G>T	p.Gly70Cys	missense_variant	1/30	5
BPTF	ENST00000544778.6	c.208G>T	p.Gly70Cys	missense_variant	1/22	5

Frequencies

GnomAD3 genomes Cov.: 30

GnomAD4 exome Data not reliable, filtered out with message: AS_VQSR AF: 0.00000115 AC: 1 AN: 868184 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 404396

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.000186

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 30

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Sep 26, 2022

The c.208G>T (p.G70C) alteration is located in exon 1 (coding exon 1) of the BPTF gene. This alteration results from a G to T substitution at nucleotide position 208, causing the glycine (G) at amino acid position 70 to be replaced by a cysteine (C). 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	0.23
BayesDel_addAF	Uncertain	0.026	T
BayesDel_noAF	Benign	-0.20
Cadd	Benign	22
Dann	Benign	0.80
Eigen	Benign	-0.048
Eigen_PC	Benign	-0.18
FATHMM_MKL	Benign	0.23	N
LIST_S2	Benign	0.31	T;T;T
M_CAP	Pathogenic	0.60	D
MetaRNN	Benign	0.30	T;T;T
MetaSVM	Benign	-0.85	T
MutationTaster	Benign	0.96	N;N;N
PrimateAI	Pathogenic	0.85	D
Sift4G	Uncertain	0.051	T;T;D
Polyphen		0.99, 1.0	.;D;D
Vest4		0.31, 0.28
MutPred		0.21		Loss of relative solvent accessibility (P = 0.008);Loss of relative solvent accessibility (P = 0.008);Loss of relative solvent accessibility (P = 0.008);
MVP		0.73
MPC		1.2
ClinPred		0.28	T
GERP RS		1.4
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		2.2
Varity_R		0.12
gMVP		0.12

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

LitVar

Other links and lift over

dbSNP: rs189405336; hg19: chr17-65822048;