NM_001371623.1:c.827_844dupGATCTGAAAGTGAGGAGG

Variant names:

• chr5-150372182-T-TAGTGAGGAGGGATCTGAA
• NM_001371623.1:c.827_844dupGATCTGAAAGTGAGGAGG

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PM4

The NM_001371623.1(TCOF1):​c.827_844dupGATCTGAAAGTGAGGAGG​(p.Gly276_Glu281dup) variant causes a disruptive inframe insertion 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 Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: TCOF1 NM_001371623.1 disruptive_inframe_insertion
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.94

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 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM4: Nonframeshift variant in NON repetitive region in NM_001371623.1.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TCOF1	NM_001371623.1	c.827_844dupGATCTGAAAGTGAGGAGG	p.Gly276_Glu281dup	disruptive_inframe_insertion	Exon 7 of 27	ENST00000643257.2	NP_001358552.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TCOF1	ENST00000643257.2	c.827_844dupGATCTGAAAGTGAGGAGG	p.Gly276_Glu281dup	disruptive_inframe_insertion	Exon 7 of 27		NM_001371623.1	ENSP00000493815.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Treacher Collins syndrome 1 Uncertain:1

Aug 22, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. This variant has been observed in at least one individual who was not affected with TCOF1-related conditions (Invitae). This variant has not been reported in the literature in individuals affected with TCOF1-related conditions. This variant is not present in population databases (gnomAD no frequency). This variant, c.827_844dup, results in the insertion of 6 amino acid(s) of the TCOF1 protein (p.Gly276_Glu281dup), but otherwise preserves the integrity of the reading frame. -

Computational scores

Source: dbNSFP v4.3

Splicing

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: chr5-149751745;