20-35871682-G-T

Position:

• chr20-35871682-G-T

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 0P and 6B. BP4_Moderate BS2

The NM_016436.5(PHF20):​c.1135G>T​(p.Val379Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000548 in 1,458,840 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000055 (0 hom.)
• Consequence: PHF20 NM_016436.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.18

Genes affected

PHF20 (HGNC:16098): (PHD finger protein 20) Predicted to enable DNA binding activity and metal ion binding activity. Involved in histone H4-K16 acetylation; histone H4-K5 acetylation; and histone H4-K8 acetylation. Located in cytosol; nuclear membrane; and nucleoplasm. Part of MLL1 complex and histone acetyltransferase complex. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Likely_benign. Variant got -6 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.10245007).
• BS2: High AC in GnomAdExome4 at 8 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PHF20	NM_016436.5	c.1135G>T	p.Val379Phe	missense_variant	9/18	ENST00000374012.8	NP_057520.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PHF20	ENST00000374012.8	c.1135G>T	p.Val379Phe	missense_variant	9/18	1	NM_016436.5	ENSP00000363124.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000548 AC: 8 AN: 1458840 Hom.: 0 Cov.: 31 AF XY: 0.00000827 AC XY: 6 AN XY: 725784

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000720

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000468 Hom.: 0

ExAC AF: 0.00000824 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Oct 29, 2021

The c.1135G>T (p.V379F) alteration is located in exon 9 (coding exon 8) of the PHF20 gene. This alteration results from a G to T substitution at nucleotide position 1135, causing the valine (V) at amino acid position 379 to be replaced by a phenylalanine (F). 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	0.079
BayesDel_addAF	Benign	-0.052	T
BayesDel_noAF	Benign	-0.31
CADD	Benign	19
DANN	Uncertain	0.99
DEOGEN2	Benign	0.034	T;T;T
Eigen	Benign	-0.11
Eigen_PC	Benign	0.010
FATHMM_MKL	Benign	0.47	N
LIST_S2	Benign	0.76	T;T;T
M_CAP	Benign	0.014	T
MetaRNN	Benign	0.10	T;T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.2	L;.;.
PrimateAI	Benign	0.37	T
PROVEAN	Benign	-1.2	N;N;N
REVEL	Benign	0.14
Sift	Uncertain	0.0040	D;D;D
Sift4G	Benign	0.63	T;T;T
Polyphen		0.58	P;.;.
Vest4		0.26
MutPred		0.069		Gain of phosphorylation at S381 (P = 0.3121);Gain of phosphorylation at S381 (P = 0.3121);Gain of phosphorylation at S381 (P = 0.3121);
MVP		0.28
MPC		0.56
ClinPred		0.17	T
GERP RS		2.3
Varity_R		0.083
gMVP		0.28

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

LitVar

Other links and lift over

dbSNP: rs750898682; hg19: chr20-34459604;