17-67825926-A-AG

Position:

• chr17-67825926-A-AG

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 8P and 4B. PVS1 BS2

The NM_182641.4(BPTF):​c.209dupG​(p.Ser71fs) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000128 in 860,984 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: 𝑓 0.0 (0 hom., cov: 30)
  • Exomes 𝑓: 0.000013 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: BPTF NM_182641.4 frameshift
• Clinical Significance: Uncertain significance criteria provided, single submitter P:1 U:1
• Conservation: PhyloP100: 0.668

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 4 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• BS2: High AC in GnomAdExome4 at 11 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BPTF	NM_182641.4	c.209dupG	p.Ser71fs	frameshift_variant	1/28	ENST00000306378.11	NP_872579.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BPTF	ENST00000306378.11	c.209dupG	p.Ser71fs	frameshift_variant	1/28	1	NM_182641.4	ENSP00000307208.6
BPTF	ENST00000582467.2	c.209dupG	p.Ser71fs	frameshift_variant	1/32	5		ENSP00000463776.2
BPTF	ENST00000321892.8	c.209dupG	p.Ser71fs	frameshift_variant	1/30	5		ENSP00000315454.4
BPTF	ENST00000544778.6	c.209dupG	p.Ser71fs	frameshift_variant	1/22	5		ENSP00000440854.2

Frequencies

GnomAD3 genomes AF: 0.00 AC: 0 AN: 145656 Hom.: 0 Cov.: 30 FAILED QC

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 0.0000128 AC: 11 AN: 860984 Hom.: 0 Cov.: 32 AF XY: 0.0000125 AC XY: 5 AN XY: 400622

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.000404

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.000316

Gnomad4 NFE exome AF: 0.0000102

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 145656 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 70878

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Pathogenic:1 Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Neurodevelopmental disorder with dysmorphic facies and distal limb anomalies Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Jun 08, 2022

- -

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jul 27, 2020

The alteration results in a premature stop codon:_x000D_ _x000D_ The c.209dupG (p.S71Qfs*3) alteration, located in coding exon 1 of the BPTF gene, consists of a duplication of G at position 209, causing a translational frameshift with a predicted alternate stop codon after 3 amino acids. The predicted stop codon occurs in the 5' region of the BPTF gene. This alteration may escape nonsense-mediated mRNAdecay and/or be rescued by re-initiation (Rivas, 2015; Lindeboom, 2016; Rhee, 2017). The exact functional effect of this alteration is unknown. The alteration is not observed in population databases:_x000D_ _x000D_ Based on data from the Genome Aggregation Database (gnomAD), the BPTF c.209dupG alteration was not observed, with coverage at this position. Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

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: rs1259365489; hg19: chr17-65822042;