Genetic Variant PHF21A:c.1685-5_1685-3dupTTT (chr11-45935741-T-TAAA) – ACMG Classification: Likely_benign (-4 pts)

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 0P and 4B. BS2

The NM_001352027.3(PHF21A):c.1685-5_1685-3dupTTT variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: 𝑓 0.000074 ( 0 hom., cov: 0)

Exomes 𝑓: 0.00026 ( 0 hom. )

Consequence

PHF21A
NM_001352027.3 splice_region, intron

Scores

Not classified

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 0.00

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: Likely_benign. The variant received -4 ACMG points.

BS2

High AC in GnomAd4 at 8 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PHF21A	NM_001352027.3 link	c.1685-5_1685-3dupTTT		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.1685-3_1685-2insTTT		splice_region_variant, intron_variant	Intron 17 of 18		NM_001352027.3	ENSP00000502222.1		Q96BD5-3

Frequencies

GnomAD3 genomes

AF:

0.0000738

AC:

AN:

108336

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000280

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.000263

AC:

109

AN:

415112

Hom.:

Cov.:

AF XY:

0.000265

AC XY:

AN XY:

219276

show subpopulations

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

African (AFR)

AF:

0.00141

AC:

AN:

10626

American (AMR)

AF:

0.000118

AC:

AN:

16914

Ashkenazi Jewish (ASJ)

AF:

0.0000834

AC:

AN:

11996

East Asian (EAS)

AF:

0.000154

AC:

AN:

25890

South Asian (SAS)

AF:

0.000657

AC:

AN:

39598

European-Finnish (FIN)

AF:

0.000153

AC:

AN:

26206

Middle Eastern (MID)

AF:

0.000453

AC:

AN:

2206

European-Non Finnish (NFE)

AF:

0.000196

AC:

AN:

260078

Other (OTH)

AF:

0.000232

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: 0.291

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:

0.0000738

AC:

AN:

108348

Hom.:

Cov.:

AF XY:

0.0000199

AC XY:

AN XY:

50178

show subpopulations

African (AFR)

AF:

0.000280

AC:

AN:

28622

American (AMR)

AF:

0.00

AC:

AN:

10328

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

2910

East Asian (EAS)

AF:

0.00

AC:

AN:

3722

South Asian (SAS)

AF:

0.00

AC:

AN:

3052

European-Finnish (FIN)

AF:

0.00

AC:

AN:

3552

Middle Eastern (MID)

AF:

0.00

AC:

AN:

216

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

53774

Other (OTH)

AF:

0.00

AC:

AN:

1440

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.556

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome 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

Alfa

AF:

0.00

Hom.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

PhyloP100

0.0

Splicing

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

Publications

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11-45935741-TAAAAAAAAAAAAAA-TAAAAAAAAAAAAAAAAA

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over