chr8-60821922-C-A

Position:

• chr8-60821922-C-A

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP2

The NM_017780.4(CHD7):​c.2830C>A​(p.Arg944Ser) variant causes a missense change. The variant allele was found at a frequency of 0.000000684 in 1,460,960 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R944H) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: CHD7 NM_017780.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 4.59

Genes affected

CHD7 (HGNC:20626): (chromodomain helicase DNA binding protein 7) This gene encodes a protein that contains several helicase family domains. Mutations in this gene have been found in some patients with the CHARGE syndrome. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Oct 2015]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), CHD7. . Gene score misZ 3.2193 (greater than the threshold 3.09). Trascript score misZ 3.9401 (greater than threshold 3.09). GenCC has associacion of gene with Kallmann syndrome, hypogonadotropic hypogonadism 5 with or without anosmia, CHARGE syndrome, hypogonadotropic hypogonadism, Omenn syndrome.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CHD7	NM_017780.4	c.2830C>A	p.Arg944Ser	missense_variant	10/38	ENST00000423902.7	NP_060250.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CHD7	ENST00000423902.7	c.2830C>A	p.Arg944Ser	missense_variant	10/38	5	NM_017780.4	ENSP00000392028.1
CHD7	ENST00000524602.5	c.1717-40307C>A		intron_variant		1		ENSP00000437061.1
CHD7	ENST00000525508.1	c.2830C>A	p.Arg944Ser	missense_variant	9/12	5		ENSP00000436027.1
CHD7	ENST00000695853.1	n.2830C>A		non_coding_transcript_exon_variant	10/37			ENSP00000512218.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000403 AC: 1 AN: 247844 Hom.: 0 AF XY: 0.00000744 AC XY: 1 AN XY: 134418

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000890

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1460960 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 726686

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: 9.00e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ExAC AF: 0.00000827 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

CHARGE syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Genetic Services Laboratory, University of Chicago

May 03, 2013

- -

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 10, 2018

The p.R944S variant (also known as c.2830C>A), located in coding exon 9 of the CHD7 gene, results from a C to A substitution at nucleotide position 2830. The arginine at codon 944 is replaced by serine, an amino acid with dissimilar properties. This alteration, which was referred to as c.2832A>C, was detected once in a cohort of individuals who had either Kallmann syndrome (KS) or congenital hypogonadotrophic hypogonadism (CHH) as well as several CHARGE syndrome features but who did not meet formal diagnostic criteria for CHARGE syndrome (Marcos S et al. J. Clin. Endocrinol. Metab., 2014 Oct;99:E2138-43).This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.36
BayesDel_addAF	Pathogenic	0.40	D
BayesDel_noAF	Pathogenic	0.34
CADD	Uncertain	24
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.74	D;.
Eigen	Uncertain	0.54
Eigen_PC	Uncertain	0.57
FATHMM_MKL	Uncertain	0.91	D
LIST_S2	Benign	0.70	T;T
M_CAP	Pathogenic	0.42	D
MetaRNN	Uncertain	0.58	D;D
MetaSVM	Pathogenic	0.97	D
MutationAssessor	Uncertain	2.7	M;M
PrimateAI	Uncertain	0.61	T
PROVEAN	Uncertain	-3.2	D;D
REVEL	Pathogenic	0.89
Sift	Benign	0.15	T;T
Sift4G	Uncertain	0.056	T;D
Polyphen		0.082	B;D
Vest4		0.57
MutPred		0.30		Gain of phosphorylation at R944 (P = 0.0031);Gain of phosphorylation at R944 (P = 0.0031);
MVP		0.94
MPC		0.54
ClinPred		0.95	D
GERP RS		5.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.56
gMVP		0.70

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: rs587783435; hg19: chr8-61734481;