chr5-150396468-T-TG

Position:

• chr5-150396468-T-TG

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_001371623.1(TCOF1):​c.3973dup​(p.Glu1325GlyfsTer75) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 31)
• Consequence: TCOF1 NM_001371623.1 frameshift
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:2
• Conservation: PhyloP100: 1.13

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 Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 5-150396468-T-TG is Pathogenic according to our data. Variant chr5-150396468-T-TG is described in ClinVar as [Pathogenic]. Clinvar id is 419066.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TCOF1	NM_001371623.1	c.3973dup	p.Glu1325GlyfsTer75	frameshift_variant	24/27	ENST00000643257.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TCOF1	ENST00000643257.2	c.3973dup	p.Glu1325GlyfsTer75	frameshift_variant	24/27		NM_001371623.1	P3

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 31

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

GeneDx

May 14, 2015

The c.3970dupG duplication in the TCOF1 gene is predicted to cause loss of normal protein function either through protein truncation or nonsense-mediated mRNA decay. The c.3970dupG variant wasnot observed in approximately 6,500 individuals of European and African American ancestry in the NHLBIExome Sequencing Project, indicating it is not a common benign variant in these populations. Although thisvariant has not been previously reported to our knowledge, we interpret it as pathogenic. -

Crouzon syndrome;C0242387:Treacher Collins syndrome Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Center for Personalized Medicine, Children's Hospital Los Angeles

Mar 15, 2016

- -

Computational scores

Source: dbNSFP v4.3

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: rs1554080460; hg19: chr5-149776031;