chr17-67975933-A-T

Position:

• chr17-67975933-A-T

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PVS1_Moderate PM2 PP5

The NM_182641.4(BPTF):​c.8701A>T​(p.Lys2901*) 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 Pathogenic (no stars).

• Frequency: Genomes: not found (cov: 33)
• Consequence: BPTF NM_182641.4 stop_gained
• Clinical Significance: Pathogenic no assertion criteria provided P:2
• Conservation: PhyloP100: 9.21

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 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most 50 bp of the penultimate exon, not predicted to undergo nonsense mediated mRNA decay. Fraction of 0.00708 CDS is truncated, and there are 2 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 17-67975933-A-T is Pathogenic according to our data. Variant chr17-67975933-A-T is described in ClinVar as [Pathogenic]. Clinvar id is 431066.Status of the report is no_assertion_criteria_provided, 0 stars. Variant chr17-67975933-A-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BPTF	NM_182641.4	c.8701A>T	p.Lys2901*	stop_gained	27/28	ENST00000306378.11	NP_872579.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BPTF	ENST00000306378.11	c.8701A>T	p.Lys2901*	stop_gained	27/28	1	NM_182641.4	ENSP00000307208.6

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: no assertion criteria provided

Submissions by phenotype

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

Pathogenic, no assertion criteria provided

clinical testing

Baylor Genetics

Jul 03, 2017

This nonsense variant has been observed once in our laboratory de novo in a 10-year-old male with speech delay, intellectual disability, pheochromocytoma. A sibling also had pheochromocytoma who shared a pathogenic VHL variant with the affected sibling. This other sibling did not carry the BPTF variant. -

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

Pathogenic, no assertion criteria provided

literature only

OMIM

Nov 07, 2017

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.62	D
BayesDel_noAF	Pathogenic	0.66
CADD	Pathogenic	46
DANN	Uncertain	1.0
Eigen	Pathogenic	0.97
Eigen_PC	Pathogenic	0.87
FATHMM_MKL	Pathogenic	0.99	D
Vest4		0.74
GERP RS		5.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		2.7

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs1555693714; hg19: chr17-65972049;