20-62064871-C-G

Variant names:

• chr20-62064871-C-G
• NM_003185.4:c.940G>C

Variant summary

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

The NM_003185.4(TAF4):​c.940G>C​(p.Ala314Pro) 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: 23)
• Consequence: TAF4 NM_003185.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.948

Genes affected

TAF4 (HGNC:11537): (TATA-box binding protein associated factor 4) Initiation of transcription by RNA polymerase II requires the activities of more than 70 polypeptides. The protein that coordinates these activities is transcription factor IID (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 one of the larger subunits of TFIID that has been shown to potentiate transcriptional activation by retinoic acid, thyroid hormone and vitamin D3 receptors. In addition, this subunit interacts with the transcription factor CREB, which has a glutamine-rich activation domain, and binds to other proteins containing glutamine-rich regions. Aberrant binding to this subunit by proteins with expanded polyglutamine regions has been suggested as one of the pathogenetic mechanisms underlying a group of neurodegenerative disorders referred to as polyglutamine diseases. [provided by RefSeq, Jul 2008]

MIR3195 (HGNC:38250): (microRNA 3195) microRNAs (miRNAs) are short (20-24 nt) non-coding RNAs that are involved in post-transcriptional regulation of gene expression in multicellular organisms by affecting both the stability and translation of mRNAs. miRNAs are transcribed by RNA polymerase II as part of capped and polyadenylated primary transcripts (pri-miRNAs) that can be either protein-coding or non-coding. The primary transcript is cleaved by the Drosha ribonuclease III enzyme to produce an approximately 70-nt stem-loop precursor miRNA (pre-miRNA), which is further cleaved by the cytoplasmic Dicer ribonuclease to generate the mature miRNA and antisense miRNA star (miRNA*) products. The mature miRNA is incorporated into a RNA-induced silencing complex (RISC), which recognizes target mRNAs through imperfect base pairing with the miRNA and most commonly results in translational inhibition or destabilization of the target mRNA. The RefSeq represents the predicted microRNA stem-loop. [provided by RefSeq, Sep 2009]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.26749152).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TAF4	NM_003185.4	c.940G>C	p.Ala314Pro	missense_variant	Exon 1 of 15	ENST00000252996.9	NP_003176.2
TAF4	XM_047440429.1	c.-177G>C		5_prime_UTR_variant	Exon 2 of 16		XP_047296385.1
MIR3195	NR_130463.1	n.70C>G		non_coding_transcript_exon_variant	Exon 1 of 1
MIR3195	unassigned_transcript_3472	n.*43C>G		downstream_gene_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TAF4	ENST00000252996.9	c.940G>C	p.Ala314Pro	missense_variant	Exon 1 of 15	1	NM_003185.4	ENSP00000252996.3
MIR3195	ENST00000585001.1	n.70C>G		non_coding_transcript_exon_variant	Exon 1 of 1	6

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 14

GnomAD4 genome Cov.: 23

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Jan 10, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.940G>C (p.A314P) alteration is located in exon 1 (coding exon 1) of the TAF4 gene. This alteration results from a G to C substitution at nucleotide position 940, causing the alanine (A) at amino acid position 314 to be replaced by a proline (P). 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	0.071
BayesDel_addAF	Benign	-0.15	T
BayesDel_noAF	Benign	-0.45
CADD	Benign	18
DANN	Benign	0.91
DEOGEN2	Benign	0.13	T
Eigen	Benign	-0.082
Eigen_PC	Benign	-0.18
FATHMM_MKL	Benign	0.54	D
LIST_S2	Benign	0.25	T
M_CAP	Uncertain	0.099	D
MetaRNN	Benign	0.27	T
MetaSVM	Benign	-0.91	T
MutationAssessor	Benign	0.90	L
PrimateAI	Pathogenic	0.84	D
PROVEAN	Benign	-0.62	N
REVEL	Benign	0.15
Sift	Uncertain	0.0080	D
Sift4G	Benign	0.12	T
Polyphen		1.0	D
Vest4		0.36
MutPred		0.29		Gain of glycosylation at A314 (P = 0.002);
MVP		0.29
MPC		0.89
ClinPred		0.32	T
GERP RS		1.9
Varity_R		0.18
gMVP		0.38

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr20-60639927;