5-150357787-T-G

Position:

• chr5-150357787-T-G

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2 PM5 PP3

The NM_001371623.1(TCOF1):​c.41T>G​(p.Ile14Ser) 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 pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. I14M) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: TCOF1 NM_001371623.1 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.59

Genes affected

TCOF1 (HGNC:11654): (treacle ribosome biogenesis factor 1) This gene encodes a nucleolar protein with a LIS1 homology domain. The protein is involved in ribosomal DNA gene transcription through its interaction with upstream binding factor (UBF). Mutations in this gene have been associated with Treacher Collins syndrome, a disorder which includes abnormal craniofacial development. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Sep 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr5-150357786-A-T is described in Lovd as [Pathogenic].
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.763

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TCOF1	NM_001371623.1	c.41T>G	p.Ile14Ser	missense_variant	1/27	ENST00000643257.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TCOF1	ENST00000643257.2	c.41T>G	p.Ile14Ser	missense_variant	1/27		NM_001371623.1	P3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Treacher Collins syndrome 1 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

3billion

Feb 23, 2023

The variant is not observed in the gnomAD v2.1.1 dataset. In silico tool predictions suggest damaging effect of the variant on gene or gene product (REVEL: 0.67; 3Cnet: 0.61). Different missense changes at the same codon (p.Ile14Met, p.Ile14Phe) have been reported to be associated with TCOF1 related disorder (PMID: 15150774, 22317976). However, the evidence of pathogenicity is insufficient at this time. Therefore, this variant is classified as VUS according to the recommendation of ACMG/AMP guideline. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Pathogenic	0.41	D
BayesDel_noAF	Pathogenic	0.35
CADD	Pathogenic	28
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.65	.;D;.;.;.;.;.;.;.;.;.;D;T;T
Eigen	Uncertain	0.38
Eigen_PC	Uncertain	0.37
FATHMM_MKL	Uncertain	0.79	D
LIST_S2	Uncertain	0.90	D;D;D;D;.;D;D;D;D;D;D;.;D;T
M_CAP	Uncertain	0.24	D
MetaRNN	Pathogenic	0.76	D;D;D;D;D;D;D;D;D;D;D;D;D;D
MetaSVM	Uncertain	0.46	D
MutationAssessor	Benign	0.90	.;L;L;L;L;.;.;L;L;L;L;L;.;.
MutationTaster	Benign	0.60	N;N;N;N;N;N;N;N
PrimateAI	Uncertain	0.74	T
PROVEAN	Pathogenic	-5.1	.;D;D;D;.;.;.;.;D;D;D;D;D;D
REVEL	Pathogenic	0.67
Sift	Pathogenic	0.0	.;D;D;D;.;.;.;.;D;D;D;D;D;.
Sift4G	Pathogenic	0.0	.;D;D;D;.;.;.;.;D;D;D;D;D;D
Polyphen		1.0, 1.0	.;D;D;D;.;.;.;.;D;D;D;D;.;.
Vest4		0.79, 0.85, 0.85, 0.82, 0.84, 0.79, 0.77
MutPred		0.58		Gain of disorder (P = 0.0017);Gain of disorder (P = 0.0017);Gain of disorder (P = 0.0017);Gain of disorder (P = 0.0017);Gain of disorder (P = 0.0017);Gain of disorder (P = 0.0017);Gain of disorder (P = 0.0017);Gain of disorder (P = 0.0017);Gain of disorder (P = 0.0017);Gain of disorder (P = 0.0017);Gain of disorder (P = 0.0017);Gain of disorder (P = 0.0017);Gain of disorder (P = 0.0017);.;
MVP		0.96
MPC		0.32
ClinPred		1.0	D
GERP RS		4.3
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.88
gMVP		0.97

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: chr5-149737350;