Genetic Variant PHF21A:c.1685-10_1685-3delTTTTTTTT (chr11-45935741-TAAAAAAAA-T) – ACMG Classification: Uncertain_significance (0 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 0P and 0B.

The NM_001352027.3(PHF21A):c.1685-10_1685-3delTTTTTTTT variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000258 in 523,370 control chromosomes in the GnomAD database, with no homozygous occurrence. There is a variant allele frequency bias in the population database for this variant (GnomAdExome4), which may indicate mosaicism or somatic mutations in the reference population data. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: 𝑓 0.000018 ( 0 hom., cov: 0)

Exomes 𝑓: 0.00032 ( 0 hom. )

Consequence

PHF21A
NM_001352027.3 splice_region, intron

Scores

Not classified

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 1.62

Publications

2 publications found

Variant links:

Genes affected

PHF21A (HGNC:24156): (PHD finger protein 21A) The PHF21A gene encodes BHC80, a component of a BRAF35 (MIM 605535)/histone deacetylase (HDAC; see MIM 601241) complex (BHC) that mediates repression of neuron-specific genes through the cis-regulatory element known as repressor element-1 (RE1) or neural restrictive silencer (NRS) (Hakimi et al., 2002 [PubMed 12032298]).[supplied by OMIM, Nov 2010]

PHF21A Gene-Disease associations (from GenCC):

complex neurodevelopmental disorder
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
intellectual developmental disorder with behavioral abnormalities and craniofacial dysmorphism with or without seizures
Inheritance: AD Classification: STRONG, MODERATE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
Potocki-Shaffer syndrome
Inheritance: AD Classification: STRONG Submitted by: G2P

PHF21A links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PHF21A	NM_001352027.3 link	c.1685-10_1685-3delTTTTTTTT		splice_region_variant, intron_variant	Intron 17 of 18	ENST00000676320.1	NP_001338956.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PHF21A	ENST00000676320.1 link	c.1685-10_1685-3delTTTTTTTT		splice_region_variant, intron_variant	Intron 17 of 18		NM_001352027.3	ENSP00000502222.1		Q96BD5-3

Frequencies

GnomAD3 genomes

AF:

0.0000185

AC:

AN:

108338

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000372

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.000320

AC:

133

AN:

415032

Hom.:

AF XY:

0.000296

AC XY:

AN XY:

219236

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.000471

AC:

AN:

10626

American (AMR)

AF:

0.000473

AC:

AN:

16908

Ashkenazi Jewish (ASJ)

AF:

0.000417

AC:

AN:

12002

East Asian (EAS)

AF:

0.000155

AC:

AN:

25886

South Asian (SAS)

AF:

0.000253

AC:

AN:

39602

European-Finnish (FIN)

AF:

0.000267

AC:

AN:

26200

Middle Eastern (MID)

AF:

0.00

AC:

AN:

2206

European-Non Finnish (NFE)

AF:

0.000327

AC:

AN:

260004

Other (OTH)

AF:

0.000417

AC:

AN:

21598

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.260

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000185

AC:

AN:

108338

Hom.:

Cov.:

AF XY:

0.0000199

AC XY:

AN XY:

50148

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

28564

American (AMR)

AF:

0.00

AC:

AN:

10320

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

2910

East Asian (EAS)

AF:

0.00

AC:

AN:

3728

South Asian (SAS)

AF:

0.00

AC:

AN:

3076

European-Finnish (FIN)

AF:

0.00

AC:

AN:

3552

Middle Eastern (MID)

AF:

0.00

AC:

AN:

236

European-Non Finnish (NFE)

AF:

0.0000372

AC:

AN:

53784

Other (OTH)

AF:

0.00

AC:

AN:

1436

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.750

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

PhyloP100

1.6

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over