NM_001015877.2:c.820C>T

Variant names:

• chrX-134415106-C-T
• rs1556019107
• NM_001015877.2:c.820C>T

Variant summary

Our verdict is Pathogenic. The variant received 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_001015877.2(PHF6):​c.820C>T​(p.Arg274*) variant causes a stop gained change. 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 Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 23)
• Consequence: PHF6 NM_001015877.2 stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:6
• Conservation: PhyloP100: 4.47
• Publications: 1 publications found

Genes affected

PHF6 (HGNC:18145): (PHD finger protein 6) This gene is a member of the plant homeodomain (PHD)-like finger (PHF) family. It encodes a protein with two PHD-type zinc finger domains, indicating a potential role in transcriptional regulation, that localizes to the nucleolus. Mutations affecting the coding region of this gene or the splicing of the transcript have been associated with Borjeson-Forssman-Lehmann syndrome (BFLS), a disorder characterized by cognitive disability, epilepsy, hypogonadism, hypometabolism, obesity, swelling of subcutaneous tissue of the face, narrow palpebral fissures, and large ears. Alternate splicing results in multiple transcript variants, encoding different isoforms. [provided by RefSeq, Jun 2010]

PHF6 Gene-Disease associations (from GenCC):

• Borjeson-Forssman-Lehmann syndrome

  Inheritance: XL Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Illumina, Genomics England PanelApp, ClinGen, Orphanet, G2P

ACMG classification

Our verdict: Pathogenic. The variant received 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 X-134415106-C-T is Pathogenic according to our data. Variant chrX-134415106-C-T is described in ClinVar as Pathogenic. ClinVar VariationId is 521446.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001015877.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PHF6	NM_001015877.2	MANE Select	c.820C>T	p.Arg274*	stop_gained	Exon 8 of 11	NP_001015877.1
	PHF6	NM_032458.3		c.820C>T	p.Arg274*	stop_gained	Exon 8 of 10	NP_115834.1
	PHF6	NM_032335.3		c.823C>T	p.Arg275*	stop_gained	Exon 8 of 8	NP_115711.2

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PHF6	ENST00000370803.8	TSL:1 MANE Select	c.820C>T	p.Arg274*	stop_gained	Exon 8 of 11	ENSP00000359839.4
	PHF6	ENST00000332070.7	TSL:1	c.820C>T	p.Arg274*	stop_gained	Exon 8 of 10	ENSP00000329097.3
	PHF6	ENST00000370799.5	TSL:1	c.823C>T	p.Arg275*	stop_gained	Exon 8 of 9	ENSP00000359835.1

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 28

GnomAD4 genome Cov.: 23

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:6

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:2

Dec 01, 2018

CeGaT Center for Human Genetics Tuebingen

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Jun 28, 2022

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Nonsense variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss of function is a known mechanism of disease; Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 32552793, 28539120, 35662002)

Borjeson-Forssman-Lehmann syndrome Pathogenic:2

Jul 11, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change creates a premature translational stop signal (p.Arg274*) in the PHF6 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in PHF6 are known to be pathogenic (PMID: 12415272, 24092917, 25099957, 26648834). This variant is not present in population databases (gnomAD no frequency). This premature translational stop signal has been observed in individual(s) with clinical features of PHF6-related conditions (PMID: 28539120). ClinVar contains an entry for this variant (Variation ID: 521446). For these reasons, this variant has been classified as Pathogenic.

Apr 05, 2024

Fulgent Genetics, Fulgent Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Inborn genetic diseases Pathogenic:1

Apr 28, 2025

Ambry Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.820C>T (p.R274*) alteration, located in exon 8 (coding exon 7) of the PHF6 gene, consists of a C to T substitution at nucleotide position 820. This changes the amino acid from a arginine (R) to a stop codon at amino acid position 274. This alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. This variant was not reported in population-based cohorts in the Genome Aggregation Database (gnomAD). This variant was determined to be de novo in at least one individual with features consistent with Borjeson-Forssman-Lehmann syndrome (Zahir, 2017; Gerber, 2022). Based on the available evidence, this alteration is classified as pathogenic.

See cases Pathogenic:1

May 20, 2021

Laboratorio de Genetica e Diagnostico Molecular, Hospital Israelita Albert Einstein

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

ACMG classification criteria: PVS1, PS4, PM2

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.74	D
BayesDel_noAF	Pathogenic	0.62
CADD	Pathogenic	37
DANN	Uncertain	1.0
FATHMM_MKL	Uncertain	0.89	D
PhyloP100		4.5
Vest4		0.94
GERP RS		5.4
Mutation Taster		=0/200	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: rs1556019107; hg19: chrX-133549136; COSMIC: COSV59699330;