NM_004606.5:c.-8C>T

Variant names:

• chrX-71366367-C-T
• rs2032471554
• NM_004606.5:c.-8C>T

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_004606.5(TAF1):​c.-8C>T variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000911 in 1,097,897 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. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 20)
  • Exomes 𝑓: 9.1e-7 (0 hom. 0 hem.)
• Consequence: TAF1 NM_004606.5 5_prime_UTR
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.930
• Publications: 0 publications found

Genes affected

TAF1 (HGNC:11535): (TATA-box binding protein associated factor 1) Initiation of transcription by RNA polymerase II requires the activities of more than 70 polypeptides. The protein that coordinates these activities is the basal transcription factor TFIID, which binds to the core promoter to position the polymerase properly, serves as the scaffold for assembly of the remainder of the transcription complex, and acts as a channel for regulatory signals. TFIID is composed of the TATA-binding protein (TBP) and a group of evolutionarily conserved proteins known as TBP-associated factors or TAFs. TAFs may participate in basal transcription, serve as coactivators, function in promoter recognition or modify general transcription factors (GTFs) to facilitate complex assembly and transcription initiation. This gene encodes the largest subunit of TFIID. This subunit binds to core promoter sequences encompassing the transcription start site. It also binds to activators and other transcriptional regulators, and these interactions affect the rate of transcription initiation. This subunit contains two independent protein kinase domains at the N- and C-terminals, but also possesses acetyltransferase activity and can act as a ubiquitin-activating/conjugating enzyme. Mutations in this gene result in Dystonia 3, torsion, X-linked, a dystonia-parkinsonism disorder. Alternative splicing of this gene results in multiple transcript variants. This gene is part of a complex transcription unit (TAF1/DYT3), wherein some transcript variants share exons with TAF1 as well as additional downstream DYT3 exons. [provided by RefSeq, Oct 2013]

TAF1 Gene-Disease associations (from GenCC):

• intellectual disability, X-linked, syndromic 33

  Inheritance: XL Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), G2P, Illumina
• X-linked dystonia-parkinsonism

  Inheritance: XL, Unknown Classification: STRONG, MODERATE, SUPPORTIVE, LIMITED Submitted by: Ambry Genetics, Genomics England PanelApp, Orphanet, Labcorp Genetics (formerly Invitae)
• X-linked intellectual disability-global development delay-facial dysmorphism-sacral caudal remnant syndrome

  Inheritance: XL Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.09016174).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TAF1	NM_004606.5	c.-8C>T		5_prime_UTR_variant	Exon 1 of 38	ENST00000423759.6	NP_004597.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TAF1	ENST00000423759.6	c.-8C>T		5_prime_UTR_variant	Exon 1 of 38	5	NM_004606.5	ENSP00000406549.2

Frequencies

GnomAD3 genomes Cov.: 20

GnomAD4 exome AF: 9.11e-7 AC: 1 AN: 1097897 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 363341

African (AFR) AF: 0.00 AC: 0 AN: 26396

American (AMR) AF: 0.00 AC: 0 AN: 35205

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 19384

East Asian (EAS) AF: 0.00 AC: 0 AN: 30204

South Asian (SAS) AF: 0.00 AC: 0 AN: 54126

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 40533

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 3937

European-Non Finnish (NFE) AF: 0.00000119 AC: 1 AN: 842050

Other (OTH) AF: 0.00 AC: 0 AN: 46062

GnomAD4 genome Cov.: 20

Alfa AF: 0.00 Hom.: 0

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Sep 19, 2019

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Not observed in large population cohorts (Lek et al., 2016); In silico analysis, which includes protein predictors and evolutionary conservation, supports that this variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.19
BayesDel_addAF	Benign	-0.46	T
BayesDel_noAF	Benign	-0.90
CADD	Benign	5.6
DANN	Uncertain	1.0
DEOGEN2	Benign	0.068	.;T;.
FATHMM_MKL	Benign	0.28	N
LIST_S2	Benign	0.73	T;T;T
M_CAP	Benign	0.017	T
MetaRNN	Benign	0.090	T;T;T
MetaSVM	Benign	-0.97	T
MutationAssessor	Benign	0.69	N;N;N
PhyloP100		-0.93
PrimateAI	Uncertain	0.58	T
PROVEAN	Benign	0.090	N;N;N
REVEL	Benign	0.0040
Sift	Benign	0.085	T;T;T
Sift4G	Benign	0.10	T;T;T
Polyphen		0.0080, 0.013	.;B;B
Vest4		0.13
MutPred		0.27		Loss of helix (P = 0.0104);Loss of helix (P = 0.0104);Loss of helix (P = 0.0104);
MVP		0.19
MPC		0.74
ClinPred		0.055	T
GERP RS		-0.94
PromoterAI		-0.13	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.042
gMVP		0.12
Mutation Taster		=95/5	polymorphism

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: rs2032471554; hg19: chrX-70586217;