chr17-75778883-C-T

Variant names:

• chr17-75778883-C-T
• rs2143630703
• NM_005324.5:c.209G>A

Variant summary

Our verdict is Uncertain significance. The variant received 5 ACMG points: 5P and 0B. PM2 PP2 PP3_Moderate

The NM_005324.5(H3-3B):​c.209G>A​(p.Arg70Lys) variant causes a missense change involving the alteration of a conserved nucleotide. 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 Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: H3-3B NM_005324.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.66
• Publications: 0 publications found

Genes affected

H3-3B (HGNC:4765): (H3.3 histone B) Histones are basic nuclear proteins that are responsible for the nucleosome structure of the chromosomal fiber in eukaryotes. Two molecules of each of the four core histones (H2A, H2B, H3, and H4) form an octamer, around which approximately 146 bp of DNA is wrapped in repeating units, called nucleosomes. The linker histone, H1, interacts with linker DNA between nucleosomes and functions in the compaction of chromatin into higher order structures. This gene contains introns and its mRNA is polyadenylated, unlike most histone genes. The protein encoded by this gene is a replication-independent histone that is a member of the histone H3 family. Pseudogenes of this gene have been identified on the X chromosome, and on chromosomes 5, 13 and 17. [provided by RefSeq, Oct 2015]

H3-3B Gene-Disease associations (from GenCC):

• Bryant-Li-Bhoj neurodevelopmental syndrome 2

  Inheritance: AD Classification: MODERATE Submitted by: G2P

ACMG classification

Our verdict: Uncertain_significance. The variant received 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the H3-3B gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 14 curated pathogenic missense variants (we use a threshold of 10). The gene has 1 curated benign missense variants. Gene score misZ: 2.8781 (below the threshold of 3.09). Trascript score misZ: 4.0007 (above the threshold of 3.09). GenCC associations: The gene is linked to Bryant-Li-Bhoj neurodevelopmental syndrome 2.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.862

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_005324.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	H3-3B	NM_005324.5	MANE Select	c.209G>A	p.Arg70Lys	missense	Exon 3 of 4	NP_005315.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	H3-3B	ENST00000254810.8	TSL:1 MANE Select	c.209G>A	p.Arg70Lys	missense	Exon 3 of 4	ENSP00000254810.3	P84243
	H3-3B	ENST00000587171.1	TSL:2	c.209G>A	p.Arg70Lys	missense	Exon 3 of 3	ENSP00000468484.1	K7ES00
	H3-3B	ENST00000852232.1		c.209G>A	p.Arg70Lys	missense	Exon 3 of 4	ENSP00000522291.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	not provided (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.95
BayesDel_addAF	Pathogenic	0.42	D
BayesDel_noAF	Pathogenic	0.36
CADD	Pathogenic	34
DANN	Uncertain	0.97
DEOGEN2	Benign	0.35	T
Eigen	Pathogenic	0.73
Eigen_PC	Pathogenic	0.72
FATHMM_MKL	Uncertain	0.87	D
LIST_S2	Benign	0.25	T
M_CAP	Benign	0.051	D
MetaRNN	Pathogenic	0.86	D
MetaSVM	Pathogenic	0.86	D
PhyloP100		7.7
PrimateAI	Pathogenic	0.85	D
PROVEAN	Uncertain	-2.9	D
REVEL	Pathogenic	0.87
Sift4G	Uncertain	0.029	D
Vest4		0.95
MutPred		0.63		Gain of methylation at R70 (P = 0.0975)
MVP		1.0
MPC		1.8
ClinPred		1.0	D
GERP RS		5.1
PromoterAI		-0.032	Neutral
gMVP		0.99

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

Other links and lift over

dbSNP: rs2143630703; hg19: chr17-73774964;