6-116616715-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001010892.3(RSPH4A):c.92C>T(p.Ser31Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000103 in 1,614,174 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. 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. S31L) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.00013 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00010 (0 hom.)
• Consequence: RSPH4A NM_001010892.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.00

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.08765036).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
RSPH4A	NM_001010892.3	c.92C>T	p.Ser31Phe	missense_variant	1/6	ENST00000229554.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
RSPH4A	ENST00000229554.10	c.92C>T	p.Ser31Phe	missense_variant	1/6	1	NM_001010892.3	P1
RSPH4A	ENST00000368581.8	c.92C>T	p.Ser31Phe	missense_variant	1/5	1
RSPH4A	ENST00000368580.4	c.92C>T	p.Ser31Phe	missense_variant	1/5	5

Frequencies

GnomAD3 genomes AF: 0.000131 AC: 20 AN: 152174 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000279

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.000131 AC: 33 AN: 251300 Hom.: 0 AF XY: 0.000125 AC XY: 17 AN XY: 135838

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: 0.000290

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000999 AC: 146 AN: 1461882 Hom.: 0 Cov.: 32 AF XY: 0.0000935 AC XY: 68 AN XY: 727240

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: 0.0000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000122

Gnomad4 OTH exome AF: 0.000132

GnomAD4 genome AF: 0.000131 AC: 20 AN: 152292 Hom.: 0 Cov.: 32 AF XY: 0.000107 AC XY: 8 AN XY: 74480

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000207

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000279

Gnomad4 OTH AF: 0.00

Alfa AF: 0.0000565 Hom.: 0

Bravo AF: 0.000121

ExAC AF: 0.000198 AC: 24

EpiCase AF: 0.000382

EpiControl AF: 0.000296

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

Ambry Genetics

Dec 25, 2022

The p.S31F variant (also known as c.92C>T), located in coding exon 1 of the RSPH4A gene, results from a C to T substitution at nucleotide position 92. The serine at codon 31 is replaced by phenylalanine, an amino acid with highly dissimilar properties. This amino acid position is conserved. In addition, this alteration is predicted to be tolerated 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	Benign	0.083
BayesDel_addAF	Benign	-0.20	T
BayesDel_noAF	Benign	-0.22
Cadd	Benign	19
Dann	Uncertain	1.0
Eigen	Benign	0.045
Eigen_PC	Benign	-0.066
FATHMM_MKL	Benign	0.11	N
LIST_S2	Benign	0.69	T;T;T
M_CAP	Benign	0.017	T
MetaRNN	Benign	0.088	T;T;T
MetaSVM	Benign	-0.77	T
MutationAssessor	Benign	1.8	L;L;L
MutationTaster	Benign	1.0	N;N;N
PrimateAI	Benign	0.29	T
PROVEAN	Benign	-1.7	N;N;N
REVEL	Benign	0.15
Sift	Uncertain	0.0010	D;D;D
Sift4G	Uncertain	0.0050	D;D;D
Polyphen		0.99	D;D;.
Vest4		0.17
MutPred		0.17		Gain of catalytic residue at S31 (P = 0.0073);Gain of catalytic residue at S31 (P = 0.0073);Gain of catalytic residue at S31 (P = 0.0073);
MVP		0.83
MPC		0.44
ClinPred		0.50	T
GERP RS		5.1
Varity_R		0.17
gMVP		0.18

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: rs150537417; hg19: chr6-116937878;