chr6-116622914-T-G

Position:

• chr6-116622914-T-G

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_001010892.3(RSPH4A):​c.833T>G​(p.Leu278Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,644 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: RSPH4A NM_001010892.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.909

Genes affected

RSPH4A (HGNC:21558): (radial spoke head component 4A) This gene encodes a protein that appears to be a component the radial spoke head, as determined by homology to similar proteins in the biflagellate alga Chlamydomonas reinhardtii and other ciliates. Radial spokes, which are regularly spaced along cilia, sperm, and flagella axonemes, consist of a thin 'stalk' and a bulbous 'head' that form a signal transduction scaffold between the central pair of microtubules and dynein. Mutations in this gene cause primary ciliary dyskinesia 1, a disease arising from dysmotility of motile cilia and sperm. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Sep 2009]

RSPH4A (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
RSPH4A	NM_001010892.3	c.833T>G	p.Leu278Arg	missense_variant	2/6	ENST00000229554.10	NP_001010892.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
RSPH4A	ENST00000229554.10	c.833T>G	p.Leu278Arg	missense_variant	2/6	1	NM_001010892.3	ENSP00000229554.5
RSPH4A	ENST00000368581.8	c.833T>G	p.Leu278Arg	missense_variant	2/5	1		ENSP00000357570.4
RSPH4A	ENST00000368580.4	c.833T>G	p.Leu278Arg	missense_variant	2/5	5		ENSP00000357569.4

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461644 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 727124

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000224

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: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

Bravo AF: 0.00000756

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Primary ciliary dyskinesia Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Apr 25, 2019

In summary, this variant is a novel missense change with uncertain impact on protein function. It has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). This variant is not present in population databases (ExAC no frequency) and has not been reported in the literature in individuals with an RSPH4A-related disease. This sequence change replaces leucine with arginine at codon 278 of the RSPH4A protein (p.Leu278Arg). The leucine residue is highly conserved and there is a moderate physicochemical difference between leucine and arginine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.15
BayesDel_addAF	Benign	-0.11	T
BayesDel_noAF	Benign	-0.40
CADD	Benign	22
DANN	Uncertain	0.99
DEOGEN2	Benign	0.0037	.;T;.
Eigen	Benign	0.15
Eigen_PC	Benign	0.16
FATHMM_MKL	Uncertain	0.92	D
LIST_S2	Benign	0.74	T;T;T
M_CAP	Benign	0.0068	T
MetaRNN	Uncertain	0.65	D;D;D
MetaSVM	Benign	-1.1	T
MutationAssessor	Uncertain	2.6	M;M;M
PrimateAI	Uncertain	0.58	T
PROVEAN	Benign	-0.69	N;N;N
REVEL	Benign	0.19
Sift	Benign	0.53	T;T;T
Sift4G	Benign	0.53	T;T;T
Polyphen		0.56	P;D;.
Vest4		0.55
MutPred		0.75		Loss of stability (P = 0.024);Loss of stability (P = 0.024);Loss of stability (P = 0.024);
MVP		0.31
MPC		0.76
ClinPred		0.84	D
GERP RS		3.6
Varity_R		0.16
gMVP		0.35

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: rs1406041200; hg19: chr6-116944077;