6-27873206-C-T

Variant names:

• chr6-27873206-C-T
• rs763177767
• NM_003546.3:c.305G>A

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM1 PM2

The NM_003546.3(H4C13):​c.305G>A​(p.Gly102Asp) variant causes a missense change. The variant allele was found at a frequency of 0.00000657 in 152,284 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: 𝑓 0.0000066 (0 hom., cov: 33)
• Consequence: H4C13 NM_003546.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.62

Genes affected

H4C13 (HGNC:4791): (H4 clustered histone 13) 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 is intronless and encodes a replication-dependent histone that is a member of the histone H4 family. Transcripts from this gene lack polyA tails but instead contain a palindromic termination element. This gene is found in the small histone gene cluster on chromosome 6p22-p21.3. [provided by RefSeq, Aug 2015]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM1: In a chain Histone H4 (size 101) in uniprot entity H4_HUMAN there are 11 pathogenic changes around while only 0 benign (100%) in NM_003546.3
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
H4C13	NM_003546.3	c.305G>A	p.Gly102Asp	missense_variant	Exon 1 of 1	ENST00000618305.2	NP_003537.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
H4C13	ENST00000618305.2	c.305G>A	p.Gly102Asp	missense_variant	Exon 1 of 1	6	NM_003546.3	ENSP00000480960.2

Frequencies

GnomAD3 genomes AF: 0.00000657 AC: 1 AN: 152284 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.0000241

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 Cov.: 31

GnomAD4 genome AF: 0.00000657 AC: 1 AN: 152284 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 74410

Gnomad4 AFR AF: 0.0000241

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

Bravo AF: 0.0000189

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

May 09, 2022

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.305G>A (p.G102D) alteration is located in exon 1 (coding exon 1) of the HIST1H4L gene. This alteration results from a G to A substitution at nucleotide position 305, causing the glycine (G) at amino acid position 102 to be replaced by an aspartic acid (D). 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
BayesDel_addAF	Pathogenic	0.19	D
BayesDel_noAF	Pathogenic	0.22
CADD	Benign	23
DANN	Uncertain	0.99
DEOGEN2	Benign	0.062	T
Eigen	Benign	0.11
Eigen_PC	Benign	0.087
FATHMM_MKL	Uncertain	0.92	D
M_CAP	Benign	0.048	D
MetaRNN	Uncertain	0.50	D
MetaSVM	Benign	-0.42	T
PrimateAI	Uncertain	0.79	T
Sift4G	Uncertain	0.059	T
Vest4		0.69
MVP		0.15
ClinPred		1.0	D
GERP RS		3.6
gMVP		0.78

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs763177767; hg19: chr6-27840984;